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Average Weather in September in Santa Rosa Peru

Daily high temperatures are around 76°F, rarely falling below 72°F or exceeding 79°F.

Daily low temperatures are around 62°F, rarely falling below 59°F or exceeding 65°F. The lowest daily average low temperature is 62°F on September 20.

For reference, on March 1, the hottest day of the year, temperatures in Santa Rosa typically range from 72°F to 88°F, while on September 19, the coldest day of the year, they range from 62°F to 76°F.

Average High and Low Temperature in September

Average High and Low Temperature in September in Santa Rosa1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303058°F58°F60°F60°F62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°FAugOctSep 175°FSep 175°F62°F62°FSep 3076°FSep 3076°F62°F62°FSep 1176°FSep 1176°F62°F62°FSep 2176°FSep 2176°F62°F62°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 temperatures for the quarter of the year centered on September. 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 September

Average Hourly Temperature in September in Santa Rosa1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctcoolcoolcomfortablewarm
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.

Schofield Barracks, Hawaii, United States (5,648 miles away) and Nouadhibou, Mauritania (4,672 miles) are the far-away foreign places with temperatures most similar to Santa Rosa (view comparison).

Clouds

The month of September in Santa Rosa experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 34% to 44%.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 66% of the time.

For reference, on February 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on July 31, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

Cloud Cover Categories in September

Cloud Cover Categories in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 166%Sep 166%Sep 3056%Sep 3056%Sep 1164%Sep 1164%Sep 2161%Sep 2161%clearmostly clearpartly cloudymostly cloudyovercast
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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santa Rosa, the chance of a wet day over the course of September is essentially constant, remaining around 1% throughout.

For reference, the year's highest daily chance of a wet day is 9% on March 10, and its lowest chance is 0% on August 14.

Probability of Precipitation in September

Probability of Precipitation in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0%0.0%0.2%0.2%0.4%0.4%0.6%0.6%0.8%0.8%1.0%1.0%1.2%1.2%1.4%1.4%1.6%1.6%1.8%1.8%2.0%2.0%2.2%2.2%AugOctSep 10%Sep 10%Sep 301%Sep 301%Sep 110%Sep 110%Sep 211%Sep 211%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).

Sun

Over the course of September in Santa Rosa, the length of the day is essentially constant. The shortest day of the month is September 1, with 11 hours, 59 minutes of daylight and the longest day is September 30, with 12 hours, 9 minutes of daylight.

Hours of Daylight and Twilight in September

Hours of Daylight and Twilight in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 7 minSep 2212 hr, 7 mindaydaydaydaynightSep 111 hr, 59 minSep 111 hr, 59 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 latest sunrise of the month in Santa Rosa is 6:19 AM on September 1 and the earliest sunrise is 15 minutes earlier at 6:04 AM on September 30.

The latest sunset is 6:18 PM on September 1 and the earliest sunset is 5 minutes earlier at 6:13 PM on September 30.

Daylight saving time is not observed in Santa Rosa during 2021.

For reference, on December 21, the longest day of the year, the Sun rises at 6:02 AM and sets 12 hours, 31 minutes later, at 6:33 PM, while on June 21, the shortest day of the year, it rises at 6:29 AM and sets 11 hours, 44 minutes later, at 6:13 PM.

Sunrise & Sunset with Twilight in September

Sunrise & Sunset with Twilight in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:04 AM6:04 AMSep 306:13 PMSep 306:13 PM6:19 AM6:19 AMSep 16:18 PMSep 16:18 PM6:14 AM6:14 AMSep 116:17 PMSep 116:17 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of September. 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.

Moon

The figure below presents a compact representation of key lunar data for September 2021. 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 September

Moon in Santa Rosa1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 88:51 AMAug 88:51 AMAug 227:03 AMAug 227:03 AMSep 67:52 PMSep 67:52 PMSep 206:55 PMSep 206:55 PMOct 66:06 AMOct 66:06 AMOct 209:57 AMOct 209:57 AM6:36 AM6:36 AM6:41 PM6:41 PM5:52 PM5:52 PM6:36 AM6:36 AM6:04 AM6:04 AM6:16 PM6:16 PM6:16 PM6:16 PM6:41 AM6:41 AM6:12 AM6:12 AM6:41 PM6:41 PM5:42 PM5:42 PM5:58 AM5:58 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.

Humidity

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 Santa Rosa is essentially constant during September, remaining within 1% of 2% throughout.

For reference, on February 21, the muggiest day of the year, there are muggy conditions 89% of the time, while on October 13, the least muggy day of the year, there are muggy conditions 1% of the time.

Humidity Comfort Levels in September

Humidity Comfort Levels in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 13%Sep 13%Sep 301%Sep 301%Sep 113%Sep 113%Sep 212%Sep 212%humidhumidcomfortablecomfortablemuggymuggy
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.

Wind

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 Santa Rosa is essentially constant during September, remaining within 0.1 miles per hour of 9.5 miles per hour throughout.

For reference, on August 14, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on March 13, the calmest day of the year, the daily average wind speed is 7.3 miles per hour.

Average Wind Speed in September

Average Wind Speed in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphAugOctSep 19.6 mphSep 19.6 mphSep 309.5 mphSep 309.5 mphSep 119.6 mphSep 119.6 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 Santa Rosa throughout September is predominantly from the south, with a peak proportion of 100% on September 1.

Wind Direction in September

Wind Direction in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctsouth
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).

Water Temperature

Santa Rosa 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 Santa Rosa is essentially constant during September, remaining around 63°F throughout.

Average Water Temperature in September

Average Water Temperature in September in Santa Rosa1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303059°F59°F60°F60°F61°F61°F62°F62°F63°F63°F64°F64°F65°F65°F66°F66°F67°F67°FAugOctSep 163°FSep 163°FSep 3062°FSep 3062°FSep 1163°FSep 1163°FSep 2163°FSep 2163°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Growing Season

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).

Temperatures in Santa Rosa are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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

Time Spent in Various Temperature Bands and the Growing Season in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 16coolcomfortablewarm
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 Santa Rosa are rapidly increasing during September, increasing by 487°F, from 1,060°F to 1,547°F, over the course of the month.

Growing Degree Days in September

Growing Degree Days in September in Santa Rosa18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030900°F900°F1,000°F1,000°F1,100°F1,100°F1,200°F1,200°F1,300°F1,300°F1,400°F1,400°F1,500°F1,500°F1,600°F1,600°F1,700°F1,700°FAugOctSep 11,060°FSep 11,060°FSep 301,547°FSep 301,547°FSep 111,228°FSep 111,228°F
The average growing degree days accumulated over the course of September, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 Santa Rosa is essentially constant during September, remaining within 0.1 kWh of 6.7 kWh throughout.

Average Daily Incident Shortwave Solar Energy in September

Average Daily Incident Shortwave Solar Energy in September in Santa Rosa181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAugOctSep 16.7 kWhSep 16.7 kWhSep 306.8 kWhSep 306.8 kWhSep 116.7 kWhSep 116.7 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.

Topography

For the purposes of this report, the geographical coordinates of Santa Rosa are -6.758 deg latitude, -79.827 deg longitude, and 108 ft elevation.

The topography within 2 miles of Santa Rosa is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 104 feet. Within 10 miles is essentially flat (1,893 feet). Within 50 miles contains very significant variations in elevation (13,488 feet).

The area within 2 miles of Santa Rosa is covered by artificial surfaces (72%) and cropland (15%), within 10 miles by cropland (27%) and shrubs (23%), and within 50 miles by water (39%) and bare soil (20%).

Data Sources

This report illustrates the typical weather in Santa Rosa, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Santa Rosa.

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

The stations contributing to this reconstruction are: Cap. FAP José A. Quiñones Gonzáles International Airport (100%, 3.3 kilometers, south) and Capitán FAP Guillermo Concha Iberico International Airport (0.2%, 194 kilometers, northwest).

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.