Average Weather in Buenos Aires Argentina
In Buenos Aires, the temperature typically varies from 47°F to 83°F over the course of the year, and is rarely below 39°F or above 90°F.
The warm season lasts for 3.5 months, from November 29 to March 14, with an average daily high temperature above 77°F. The hottest day of the year is January 15, with an average high of 83°F and low of 70°F.
The cool season lasts for 3.1 months, from May 25 to August 27, with an average daily high temperature below 62°F. The coldest day of the year is July 18, with an average low of 47°F and high of 57°F.
Average High and Low Temperature
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
The length of the day in Buenos Aires varies significantly over the course of the year. In 2017, the shortest day is June 21, with 9 hours, 50 minutes of daylight; the longest day is December 21, with 14 hours, 29 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:33 AM on December 4, and the latest sunrise is 2 hours, 28 minutes later at 8:01 AM on June 29. The earliest sunset is at 5:49 PM on June 10, and the latest sunset is 2 hours, 21 minutes later at 8:10 PM on January 6.
Daylight saving time (DST) is not observed in Buenos Aires during 2017.
Sunrise & Sunset with Twilight
In Buenos Aires, 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 Buenos Aires begins around September 21 and lasts for 7.1 months, ending around April 24. On January 18, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.
The cloudier part of the year begins around April 24 and lasts for 4.9 months, ending around September 21. On June 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 51% of the time, and clear, mostly clear, or partly cloudy 49% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Buenos Aires varies throughout the year.
The wetter season lasts 6.4 months, from October 7 to April 18, with a greater than 27% chance of a given day being a wet day. The chance of a wet day peaks at 36% on February 8.
The drier season lasts 5.6 months, from April 18 to October 7. The smallest chance of a wet day is 17% on August 12.
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 36% on February 8.
Daily Chance of Precipitation
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. Buenos Aires experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Buenos Aires. The most rain falls during the 31 days centered around February 7, with an average total accumulation of 4.7 inches.
The least rain falls around June 30, with and average total accumulation of 2.0 inches.
Average Monthly Rainfall
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.
Buenos Aires experiences very significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.9 months, from November 16 to April 14, during which time the comfort level is muggy, oppressive, or miserable at least 13% of the time. The muggiest day of the year is February 8, with muggy conditions 51% of the time.
The least muggy day of the year is July 18, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 Buenos Aires does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 5.8 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Buenos Aires varies throughout the year.
The wind is most often from the north for 4.7 months, from April 14 to September 5, with a peak percentage of 35% on May 29. The wind is most often from the east for 7.3 months, from September 5 to April 14, with a peak percentage of 45% on January 10.
Buenos Aires 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 7 to March 30, with an average temperature above 71°F. The day of the year with the warmest water is January 31, with an average temperature of 76°F.
The time of year with cooler water lasts for 3.5 months, from June 4 to September 20, with an average temperature below 59°F. The day of the year with the coolest water is July 25, with an average temperature of 54°F.
Average Water Temperature
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 3.5 months, from October 31 to February 13, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is January 1, with an average of 7.9 kWh.
The darker period of the year lasts for 3.5 months, from April 30 to August 16, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is June 26, with an average of 2.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Buenos Aires are -34.613 deg latitude, -58.377 deg longitude, and 36 ft elevation.
The topography within 2 miles of Buenos Aires contains only modest variations in elevation, with a maximum elevation change of 207 feet, and an average elevation above sea level of 72 feet. Within 10 miles also contains only modest variations in elevation (243 feet). Within 50 miles also contains only modest variations in elevation (482 feet).
The area within 2 miles of Buenos Aires is covered by artificial surfaces (47%), trees (14%), water (12%), and grassland (11%), within 10 miles by water (47%) and artificial surfaces (38%), and within 50 miles by cropland (29%) and water (28%).
This report illustrates the typical weather in Buenos Aires, 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 Buenos Aires.
For each station, the records are corrected for the elevation difference between that station and Buenos Aires 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 Buenos Aires is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Buenos Aires and a given station.
The stations contributing to this reconstruction are: Jorge Newbery Airport (85%, 7 kilometers, northwest), Buenos Aires - Ministro Pistarini International Airport (11%, 27 kilometers, southwest), and Colonia del Sacramento International Airport (3.6%, 58 kilometers, east).
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 .