Average Weather in September in 25 de Mayo Uruguay
Daily high temperatures increase by 3°F, from 67°F to 69°F, rarely falling below 55°F or exceeding 80°F.
Daily low temperatures increase by 3°F, from 45°F to 47°F, rarely falling below 34°F or exceeding 57°F.
For reference, on January 15, the hottest day of the year, temperatures in 25 de Mayo typically range from 62°F to 88°F, while on July 9, the coldest day of the year, they range from 41°F to 60°F.
Average High and Low Temperature in September
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
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 month of September in 25 de Mayo experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 45% to 41%.
The clearest day of the month is September 27, with clear, mostly clear, or partly cloudy conditions 59% of the time.
For reference, on June 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on January 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in September
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In 25 de Mayo, the chance of a wet day over the course of September is essentially constant, remaining around 22% throughout.
For reference, the year's highest daily chance of a wet day is 32% on February 13, and its lowest chance is 19% on July 31.
Probability of Precipitation in September
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during September in 25 de Mayo is essentially constant, remaining about 3.3 inches throughout, and rarely exceeding 6.3 inches or falling below 1.0 inches.
Average Monthly Rainfall in September
Over the course of September in 25 de Mayo, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 0 minutes, implying an average daily increase of 2 minutes, 5 seconds, and weekly increase of 14 minutes, 36 seconds.
The shortest day of the month is September 1, with 11 hours, 23 minutes of daylight and the longest day is September 30, with 12 hours, 23 minutes of daylight.
Hours of Daylight and Twilight in September
The latest sunrise of the month in 25 de Mayo is 7:04 AM on September 1 and the earliest sunrise is 40 minutes earlier at 6:23 AM on September 30.
The earliest sunset is 6:27 PM on September 1 and the latest sunset is 20 minutes later at 6:47 PM on September 30.
Daylight saving time is not observed in 25 de Mayo during 2019.
For reference, on December 22, the longest day of the year, the Sun rises at 5:30 AM and sets 14 hours, 27 minutes later, at 7:57 PM, while on June 21, the shortest day of the year, it rises at 7:51 AM and sets 9 hours, 52 minutes later, at 5:43 PM.
Sunrise & Sunset with Twilight in September
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 25 de Mayo is essentially constant during September, remaining within 1% of 3% throughout.
For reference, on February 10, the muggiest day of the year, there are muggy conditions 32% of the time, while on July 21, the least muggy day of the year, there are muggy conditions 1% of the time.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 25 de Mayo is essentially constant during September, remaining within 0.1 miles per hour of 9.5 miles per hour throughout.
For reference, on September 13, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on May 6, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
The highest daily average wind speed during September is 9.7 miles per hour on September 13.
Average Wind Speed in September
Wind Direction in September
25 de Mayo 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 25 de Mayo is increasing during September, rising by 4°F, from 55°F to 58°F, over the course of the month.
Average Water Temperature in September
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).
The growing season in 25 de Mayo typically lasts for 8.1 months (247 days), from around September 14 to around May 18, rarely starting before August 20 or after October 15, and rarely ending before April 24 or after June 14.
The month of September in 25 de Mayo is very likely fully outside of the growing season, with the chance that a given day is in the growing season very rapidly increasing from 25% to 79% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
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
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 25 de Mayo are increasing during September, increasing by 222°F, from 307°F to 528°F, over the course of the month.
Growing Degree Days in September
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 25 de Mayo is increasing during September, rising by 1.3 kWh, from 4.1 kWh to 5.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of 25 de Mayo are -34.189 deg latitude, -56.339 deg longitude, and 197 ft elevation.
The topography within 2 miles of 25 de Mayo contains only modest variations in elevation, with a maximum elevation change of 203 feet and an average elevation above sea level of 192 feet. Within 10 miles also contains only modest variations in elevation (400 feet). Within 50 miles contains only modest variations in elevation (860 feet).
The area within 2 miles of 25 de Mayo is covered by grassland (54%) and cropland (37%), within 10 miles by grassland (55%) and cropland (39%), and within 50 miles by grassland (59%) and cropland (30%).
This report illustrates the typical weather in 25 de Mayo year round, 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 25 de Mayo.
For each station, the records are corrected for the elevation difference between that station and 25 de Mayo 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 25 de Mayo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between 25 de Mayo and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.
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.