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Summer Weather in Lafayette California, United States

Daily high temperatures increase by 5°F, from 73°F to 78°F, rarely falling below 65°F or exceeding 88°F. The highest daily average high temperature is 79°F on August 23.

Daily low temperatures are around 55°F, rarely falling below 49°F or exceeding 60°F. The highest daily average low temperature is 56°F on July 25.

For reference, on August 22, the hottest day of the year, temperatures in Lafayette typically range from 56°F to 79°F, while on December 31, the coldest day of the year, they range from 40°F to 53°F.

Average High and Low Temperature in the Summer in Lafayette

Average High and Low Temperature in the Summer in LafayetteJunJulAug45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°FSpringFallAug 2279°FAug 2279°F56°F56°FJun 173°FJun 173°F53°F53°FJul 178°FJul 178°F56°F56°FAug 179°FAug 179°F56°F56°F
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.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, 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 the Summer in Lafayette

Average Hourly Temperature in the Summer in LafayetteJunJulAug12 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 AMSpringFallcoldcoolcoolcomfortablewarmcold
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.

Porto de Mós, Portugal (5,625 miles away) and Melbourne, Australia (7,892 miles) are the far-away foreign places with temperatures most similar to Lafayette (view comparison).

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The summer in Lafayette experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 25% to 11%. The lowest chance of overcast or mostly cloudy conditions is 8% on July 19.

The clearest day of the summer is July 19, with clear, mostly clear, or partly cloudy conditions 92% of the time.

For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on July 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.

Cloud Cover Categories in the Summer in Lafayette

Cloud Cover Categories in the Summer in LafayetteJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallJan 1144%Jan 1144%Jun 175%Jun 175%Aug 3189%Aug 3189%Jul 188%Jul 188%Aug 191%Aug 191%clearovercastmostly cloudypartly 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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lafayette, the chance of a wet day over the course of the summer is gradually decreasing, starting the season at 4% and ending it at 1%.

For reference, the year's highest daily chance of a wet day is 30% on February 20, and its lowest chance is 0% on July 23.

Probability of Precipitation in the Summer in Lafayette

Probability of Precipitation in the Summer in LafayetteJunJulAug0%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%9%9%10%10%SpringFallJul 180%Jul 180%Jun 14%Jun 14%Aug 311%Aug 311%Jul 11%Jul 11%Aug 10%Aug 10%rain
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).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Lafayette is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 1.0 inches.

The lowest average 31-day accumulation is 0.0 inches on July 30.

Average Monthly Rainfall in the Summer in Lafayette

Average Monthly Rainfall in the Summer in LafayetteJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inSpringFallJul 300.0 inJul 300.0 inJun 10.3 inJun 10.3 inAug 310.1 inAug 310.1 inJul 10.0 inJul 10.0 in
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.

Over the course of the summer in Lafayette, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 38 minutes, implying an average daily decrease of 1 minute, 4 seconds, and weekly decrease of 7 minutes, 31 seconds.

The shortest day of the summer is August 31, with 13 hours, 0 minutes of daylight and the longest day is June 20, with 14 hours, 48 minutes of daylight.

Hours of Daylight and Twilight in the Summer in Lafayette

Hours of Daylight and Twilight in the Summer in LafayetteJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2014 hr, 48 minJun 2014 hr, 48 minnightnightdaydayAug 3113 hr, 0 minAug 3113 hr, 0 minAug 114 hr, 4 minAug 114 hr, 4 min
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.

The earliest sunrise of the summer in Lafayette is 5:45 AM on June 13 and the latest sunrise is 53 minutes later at 6:38 AM on August 31.

The latest sunset is 8:34 PM on June 27 and the earliest sunset is 57 minutes earlier at 7:38 PM on August 31.

Daylight saving time is observed in Lafayette during 2024, but it neither starts nor ends during the summer, so the entire season is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:46 AM and sets 14 hours, 48 minutes later, at 8:34 PM, while on December 21, the shortest day of the year, it rises at 7:20 AM and sets 9 hours, 32 minutes later, at 4:53 PM.

Sunrise & Sunset with Twilight in the Summer in Lafayette

Sunrise & Sunset with Twilight in the Summer in LafayetteJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall5:45 AM5:45 AMJun 138:31 PMJun 138:31 PM6:38 AM6:38 AMAug 317:38 PMAug 317:38 PM5:50 AM5:50 AMJul 18:34 PMJul 18:34 PM6:12 AM6:12 AMAug 18:16 PMAug 18:16 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the summer. 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 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 the Summer in Lafayette

Solar Elevation and Azimuth in the Summer in LafayetteJunJulAug12 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 AMSpringFall0010202030304050506060700010102030304040506070
northeastsouthwest
Solar elevation and azimuth in the the summer of 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 the summer of 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Summer in Lafayette

Moon Rise, Set & Phases in the Summer in LafayetteJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 78:23 PMMay 78:23 PMMay 236:54 AMMay 236:54 AMJun 65:38 AMJun 65:38 AMJun 216:09 PMJun 216:09 PMJul 53:58 PMJul 53:58 PMJul 213:18 AMJul 213:18 AMAug 44:14 AMAug 44:14 AMAug 1911:26 AMAug 1911:26 AMSep 26:56 PMSep 26:56 PMSep 177:35 PMSep 177:35 PM5:35 AM5:35 AM8:06 PM8:06 PM7:56 PM7:56 PM5:37 AM5:37 AM5:30 AM5:30 AM9:21 PM9:21 PM8:56 PM8:56 PM6:00 AM6:00 AM9:01 PM9:01 PM8:31 PM8:31 PM6:02 AM6:02 AM8:49 PM8:49 PM7:45 PM7:45 PM6:10 AM6:10 AM7:41 PM7:41 PM7:11 PM7:11 PM7:31 AM7:31 AM
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 chance that a given day will be muggy in Lafayette is essentially constant during the summer, remaining around 0% throughout.

For reference, on September 6, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Summer in Lafayette

Humidity Comfort Levels in the Summer in LafayetteJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallJun 10%Jun 10%Aug 310%Aug 310%Jul 10%Jul 10%Aug 10%Aug 10%comfortablecomfortabledrydry
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.

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 Lafayette is decreasing during the summer, decreasing from 9.6 miles per hour to 8.5 miles per hour over the course of the season.

For reference, on June 20, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on October 31, the calmest day of the year, the daily average wind speed is 6.7 miles per hour.

The highest daily average wind speed during the summer is 9.7 miles per hour on June 21.

Average Wind Speed in the Summer in Lafayette

Average Wind Speed in the Summer in LafayetteJunJulAug0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphSpringFallJun 219.7 mphJun 219.7 mphJun 19.6 mphJun 19.6 mphAug 318.5 mphAug 318.5 mphAug 19.2 mphAug 19.2 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Lafayette throughout the summer is predominantly from the west, with a peak proportion of 95% on July 31.

Wind Direction in the Summer in Lafayette

Wind Direction in the Summer in LafayetteJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallwestnorth
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).

Lafayette 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 surface water temperature in Lafayette is increasing during the summer, rising by 4°F, from 53°F to 58°F, over the course of the season.

Average Water Temperature in the Summer in Lafayette

Average Water Temperature in the Summer in LafayetteJunJulAug50°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°FSpringFallJun 153°FJun 153°FAug 3158°FAug 3158°FJul 155°FJul 155°FAug 157°FAug 157°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Lafayette over some winters. The day least likely to be in the growing season is December 27, with a 51% chance.

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Lafayette

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Lafayettegrowing seasonJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 17coldcoolcomfortablewarmhot
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.

The average accumulated growing degree days in Lafayette are very rapidly increasing during the summer, increasing by 1,345°F, from 775°F to 2,120°F, over the course of the season.

Growing Degree Days in the Summer in Lafayette

Growing Degree Days in the Summer in LafayetteJunJulAug600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°F1,400°F1,400°F1,600°F1,600°F1,800°F1,800°F2,000°F2,000°F2,200°F2,200°F2,400°F2,400°FSpringFallJun 1775°FJun 1775°FAug 312,120°FAug 312,120°FJul 11,180°FJul 11,180°FAug 11,658°FAug 11,658°F
The average growing degree days accumulated over the course of the summer, 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 in Lafayette is decreasing during the summer, falling by 1.1 kWh, from 8.0 kWh to 6.9 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 8.4 kWh on June 28.

Average Daily Incident Shortwave Solar Energy in the Summer in Lafayette

Average Daily Incident Shortwave Solar Energy in the Summer in LafayetteJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJun 288.4 kWhJun 288.4 kWhJun 18.0 kWhJun 18.0 kWhAug 316.9 kWhAug 316.9 kWhAug 17.9 kWhAug 17.9 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Lafayette are 37.886 deg latitude, -122.118 deg longitude, and 305 ft elevation.

The topography within 2 miles of Lafayette contains very significant variations in elevation, with a maximum elevation change of 928 feet and an average elevation above sea level of 516 feet. Within 10 miles contains very significant variations in elevation (2,949 feet). Within 50 miles contains large variations in elevation (4,324 feet).

The area within 2 miles of Lafayette is covered by artificial surfaces (59%) and grassland (19%), within 10 miles by artificial surfaces (42%) and grassland (28%), and within 50 miles by grassland (22%) and water (21%).

This report illustrates the typical weather in Lafayette, 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 Lafayette.

For each station, the records are corrected for the elevation difference between that station and Lafayette 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 Lafayette is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lafayette 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 Lafayette 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.