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Average Weather in Montevideo Uruguay

In Montevideo, the temperature typically varies from 45°F to 80°F over the course of the year, and is rarely below 35°F or above 89°F.

The warm season lasts for 3.5 months, from December 3 to March 20, with an average daily high temperature above 76°F. The hottest day of the year is January 15, with an average high of 80°F and low of 65°F.

The cool season lasts for 3.0 months, from May 26 to August 27, with an average daily high temperature below 62°F. The coldest day of the year is July 9, with an average low of 45°F and high of 57°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, 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 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

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoldcoldcoolcoolcomfortablecomfortablewarmwarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day in Montevideo varies significantly over the course of the year. In 2017, the shortest day is June 21, with 9 hours, 49 minutes of daylight; the longest day is December 21, with 14 hours, 30 minutes of daylight.

Hours of Daylight and Twilight

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 is at 5:23 AM on December 5, and the latest sunrise is 2 hours, 29 minutes later at 7:53 AM on June 30. The earliest sunset is at 5:39 PM on June 11, and the latest sunset is 2 hours, 23 minutes later at 8:02 PM on January 6.

Daylight saving time (DST) is not observed in Montevideo during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. 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.

Clouds

In Montevideo, 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 Montevideo begins around October 4 and lasts for 6.4 months, ending around April 16. On January 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 28% of the time.

The cloudier part of the year begins around April 16 and lasts for 5.6 months, ending around October 4. On June 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 453%Jun 453%Jan 1528%Jan 1528%Oct 441%Oct 441%Apr 1641%Apr 1641%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 6.3 months, from October 13 to April 23, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 30% on February 11.

The drier season lasts 5.7 months, from April 23 to October 13. The smallest chance of a wet day is 20% on July 31.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 30% on February 11.

Daily Chance of Precipitation

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

Rain falls throughout the year in Montevideo. The most rain falls during the 31 days centered around April 7, with an average total accumulation of 4.2 inches.

The least rain falls around July 23, with and average total accumulation of 2.7 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

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.

Montevideo experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.6 months, from November 26 to April 13, during which time the comfort level is muggy, oppressive, or miserable at least 12% of the time. The muggiest day of the year is February 9, with muggy conditions 46% of the time.

The least muggy day of the year is July 20, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

muggymuggymuggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 200%Jul 200%Feb 946%Feb 946%Nov 2612%Nov 2612%Apr 1312%Apr 1312%miserablemiserablemuggymuggycomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Montevideo does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 6.4 miles per hour throughout.

Average Wind Speed

0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mphJanFebMarAprMayJunJulAugSepOctNovDecNov 126.8 mphNov 126.8 mphMay 66.0 mphMay 66.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the north for 4.5 months, from April 17 to September 1, with a peak percentage of 31% on May 31. The wind is most often from the east for 7.5 months, from September 1 to April 17, with a peak percentage of 44% on January 10.

Wind Direction

EENNEE0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 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

Montevideo 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.7 months, from December 9 to April 1, with an average temperature above 70°F. The day of the year with the warmest water is January 23, with an average temperature of 74°F.

The time of year with cooler water lasts for 3.4 months, from June 8 to September 20, with an average temperature below 56°F. The day of the year with the coolest water is July 24, with an average temperature of 52°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, 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 experiences very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.2 months, from November 4 to February 10, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is January 6, with an average of 8.0 kWh.

The darker period of the year lasts for 3.7 months, from April 29 to August 19, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is June 27, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy

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 Montevideo are -34.903 deg latitude, -56.188 deg longitude, and 3 ft elevation.

The topography within 2 miles of Montevideo contains only modest variations in elevation, with a maximum elevation change of 226 feet, and an average elevation above sea level of 52 feet. Within 10 miles also contains only modest variations in elevation (489 feet). Within 50 miles contains very significant variations in elevation (1,348 feet).

The area within 2 miles of Montevideo is covered by artificial surfaces (36%), trees (32%), and water (28%), within 10 miles by water (51%) and artificial surfaces (15%), and within 50 miles by water (61%) and grassland (22%).

Data Sources

This report illustrates the typical weather in Montevideo, 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 Montevideo.

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

The stations contributing to this reconstruction are: Carrasco International Airport (97%, 16 kilometers, northeast) and Colonia del Sacramento International Airport (3.4%, 153 kilometers, west).

Other Data

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 .