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Climate and Average Weather Year Round in Riverside California, United States

In Riverside, the summers are hot, arid, and clear and the winters are long, cool, and partly cloudy. Over the course of the year, the temperature typically varies from 43°F to 94°F and is rarely below 36°F or above 103°F.

Based on the tourism score, the best time of year to visit Riverside for warm-weather activities is from late May to mid October.

Climate in Riverside

comfortablewarmhotwarmcomfortableJanFebMarAprMayJunJulAugSepOctNovDecNowNow90%90%55%55%clearovercastprecipitation: 2.7 inprecipitation: 2.7 in0.1 in0.1 inmuggy: 6%muggy: 6%0%0%drydrytourism score: 7.7tourism score: 7.72.52.5
Riverside weather by month. Click on each chart for more information.

The hot season lasts for 3.0 months, from June 23 to September 22, with an average daily high temperature above 89°F. The hottest month of the year in Riverside is August, with an average high of 94°F and low of 65°F.

The cool season lasts for 3.8 months, from November 22 to March 16, with an average daily high temperature below 72°F. The coldest month of the year in Riverside is December, with an average low of 44°F and high of 68°F.

Average High and Low Temperature in Riverside

Average High and Low Temperature in RiversidehotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°F110°F110°FDec 2667°FDec 2667°FAug 2294°FAug 2294°F43°F43°F65°F65°FJun 2389°FJun 2389°FMar 1672°FMar 1672°F61°F61°F61°F61°F47°F47°F48°F48°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 68°F69°F72°F77°F80°F87°F92°F94°F90°F83°F74°F68°F
Temp. 55°F56°F58°F62°F66°F71°F77°F78°F75°F68°F60°F54°F
Low 44°F46°F48°F51°F56°F60°F64°F65°F62°F56°F49°F44°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in Riverside

Average Hourly Temperature in RiversideJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowcoldcoldcoldcoldcoolcoolcoolcoolcomfortablewarmhotvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Youssoufia, Morocco (5,943 miles away) is the far-away foreign place with temperatures most similar to Riverside (view comparison).

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In Riverside, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Riverside begins around April 24 and lasts for 6.3 months, ending around November 4.

The clearest month of the year in Riverside is September, during which on average the sky is clear, mostly clear, or partly cloudy 89% of the time.

The cloudier part of the year begins around November 4 and lasts for 5.7 months, ending around April 24.

The cloudiest month of the year in Riverside is February, during which on average the sky is overcast or mostly cloudy 44% of the time.

Cloud Cover Categories in Riverside

Cloud Cover Categories in RiversideclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 690%Sep 690%Feb 2055%Feb 2055%Apr 2472%Apr 2472%Nov 473%Nov 473%NowNowclearovercastmostly clearpartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 39%44%37%29%23%13%13%12%11%20%31%39%
Clearer 61%56%63%71%77%87%87%88%89%80%69%61%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Riverside varies throughout the year.

The wetter season lasts 4.2 months, from November 25 to April 1, with a greater than 10% chance of a given day being a wet day. The month with the most wet days in Riverside is February, with an average of 5.4 days with at least 0.04 inches of precipitation.

The drier season lasts 7.8 months, from April 1 to November 25. The month with the fewest wet days in Riverside is June, with an average of 0.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Riverside is February, with an average of 5.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 20% on February 20.

Daily Chance of Precipitation in Riverside

Daily Chance of Precipitation in RiversidewetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2020%Feb 2020%Jun 240%Jun 240%Nov 2510%Nov 2510%Apr 110%Apr 110%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 4.7d5.4d4.4d2.2d0.7d0.2d0.6d0.8d0.9d1.6d2.6d4.4d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Riverside experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.9 months, from October 23 to April 19, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Riverside is February, with an average rainfall of 2.7 inches.

The rainless period of the year lasts for 6.1 months, from April 19 to October 23. The month with the least rain in Riverside is June, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Riverside

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.1″2.7″1.6″0.6″0.2″0.1″0.1″0.1″0.2″0.4″0.9″1.8″

The length of the day in Riverside varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 54 minutes of daylight; the longest day is June 20, with 14 hours, 25 minutes of daylight.

Hours of Daylight and Twilight in Riverside

Hours of Daylight and Twilight in RiversideJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 1912 hr, 7 minMar 1914 hr, 25 minJun 2014 hr, 25 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 54 minDec 219 hr, 54 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 10.2h11.0h12.0h13.1h14.0h14.4h14.1h13.4h12.3h11.3h10.4h9.9h

The earliest sunrise is at 5:37 AM on June 12, and the latest sunrise is 1 hour, 33 minutes later at 7:10 AM on November 2. The earliest sunset is at 4:40 PM on December 3, and the latest sunset is 3 hours, 25 minutes later at 8:04 PM on June 28.

Daylight saving time (DST) is observed in Riverside during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Riverside

Sunrise & Sunset with Twilight and Daylight Saving Time in RiversideJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 125:37 AMJun 125:37 AM8:04 PMJun 288:04 PMJun 28Dec 34:40 PMDec 34:40 PM7:10 AMNov 27:10 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Riverside

Solar Elevation and Azimuth in RiversideJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM00010101010202020303030404040505060607000010101020202020303030404040505060703379NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Riverside

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Riverside, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 3% of 3% throughout.

Humidity Comfort Levels in Riverside

Humidity Comfort Levels in RiversideJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 260%Feb 260%Aug 116%Aug 116%humidhumidcomfortablecomfortabledrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.2d1.0d1.8d1.1d0.2d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Riverside experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from November 9 to May 24, with average wind speeds of more than 6.2 miles per hour. The windiest month of the year in Riverside is December, with an average hourly wind speed of 7.0 miles per hour.

The calmer time of year lasts for 5.5 months, from May 24 to November 9. The calmest month of the year in Riverside is September, with an average hourly wind speed of 5.2 miles per hour.

Average Wind Speed in Riverside

Average Wind Speed in RiversidewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphDec 307.2 mphDec 307.2 mphSep 85.1 mphSep 85.1 mphMay 246.2 mphMay 246.2 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 7.06.86.56.76.35.95.65.35.25.66.47.0

The predominant average hourly wind direction in Riverside varies throughout the year.

The wind is most often from the west for 8.8 months, from February 14 to November 7, with a peak percentage of 56% on May 21. The wind is most often from the north for 1.5 months, from November 7 to December 23 and for 1.7 months, from December 23 to February 14, with a peak percentage of 33% on December 9.

Wind Direction in Riverside

Wind Direction in RiversideNWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Riverside is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.2 months, from July 5 to October 10, with an average temperature above 67°F. The month of the year in Riverside with the warmest water is August, with an average temperature of 69°F.

The time of year with cooler water lasts for 4.5 months, from December 8 to April 24, with an average temperature below 61°F. The month of the year in Riverside with the coolest water is February, with an average temperature of 59°F.

Average Water Temperature in Riverside

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 59°F59°F59°F60°F63°F65°F68°F69°F69°F67°F63°F60°F

To characterize how pleasant the weather is in Riverside throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Riverside for general outdoor tourist activities is from late May to mid October, with a peak score in the last week of June.

Tourism Score in Riverside

Tourism Score in Riversidebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.77.72.52.57.67.6NowNow cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Riverside for hot-weather activities is from early July to early September, with a peak score in the third week of August.

Beach/Pool Score in Riverside

Beach/Pool Score in Riversidebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.55.50.50.5NowNowtemperaturetemperaturecloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

While it does not do so every year, freezing temperatures are seen in Riverside over some winters. The day least likely to be in the growing season is January 4, with a 74% chance.

Time Spent in Various Temperature Bands and the Growing Season in Riverside

Time Spent in Various Temperature Bands and the Growing Season in Riversidegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Feb 390%Feb 390%Dec 990%Dec 974%Jan 574%Jan 5Jul 12100%Jul 12100%NowNowvery coldcoldcoolcomfortablewarmhotsweltering
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Riverside should appear around January 15, only rarely appearing before January 11 or after January 24.

Growing Degree Days in Riverside

Growing Degree Days in RiversideJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°FJan 1590°FJan 1590°FApr 18900°FApr 18900°FJun 121,800°FJun 121,800°FDec 315,504°FDec 315,504°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.8 months, from April 24 to August 16, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest month of the year in Riverside is June, with an average of 8.5 kWh.

The darker period of the year lasts for 3.2 months, from November 5 to February 12, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest month of the year in Riverside is December, with an average of 3.1 kWh.

Average Daily Incident Shortwave Solar Energy in Riverside

Average Daily Incident Shortwave Solar Energy in RiversidebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 178.6 kWhJun 178.6 kWhDec 213.0 kWhDec 213.0 kWhApr 247.5 kWhApr 247.5 kWhAug 167.5 kWhAug 167.5 kWhNov 54.1 kWhNov 54.1 kWhFeb 124.1 kWhFeb 124.1 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 3.44.25.87.28.18.58.27.56.45.03.83.1

For the purposes of this report, the geographical coordinates of Riverside are 33.953 deg latitude, -117.396 deg longitude, and 827 ft elevation.

The topography within 2 miles of Riverside contains only modest variations in elevation, with a maximum elevation change of 472 feet and an average elevation above sea level of 849 feet. Within 10 miles contains only modest variations in elevation (2,516 feet). Within 50 miles contains large variations in elevation (11,503 feet).

The area within 2 miles of Riverside is covered by artificial surfaces (97%), within 10 miles by shrubs (56%) and artificial surfaces (32%), and within 50 miles by shrubs (58%) and artificial surfaces (18%).

This report illustrates the typical weather in Riverside, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Riverside.

For each station, the records are corrected for the elevation difference between that station and Riverside according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Riverside is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Riverside and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Riverside and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.