Climate in Rio de la Plata

Average daytime and nighttime temperatures

All climate diagrams on this site result from the collected data from eleven measuring weather stations in Rio de la Plata.
All data correspond to the average monthly values of the last 20 years.

Back to overview: Uruguay

For several months of the year, it is warm to hot at temperatures continuously above 25 degrees, sometimes up to 31 degrees. Due to the warmer temperatures, the best time for traveling is in January. Less attractive are the cold months from May to September.
Overview: Climate in Uruguay
Daylengths and sun positions in Uruguay
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 9 hours per day, January is the sunniest month in the greater region of Rio de la Plata. In June, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 7 rain days, December offers the most rain days, while June has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 2.1 mm, the least amount of rain falls in June. February, on the other hand, has the most rain.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With humidity averaging 80%, June is the most uncomfortable. In December, on the other hand, it is easier to endure.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is only reached in a few months in Rio de la Plata, although these are always average values.
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity, the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other greater regions in Uruguay

Map of Rio de la Plata

Most important cities in the greater region »Rio de la Plata«

As the capital region, it is arguably the most important part of Uruguay. The greater region has a west-east extension of about 260 km and over 250 km from north to south.

It consists of the six departments Canelones, Colonia, Montevideo, Río Negro, San José and Soriano.

CityPopulationGeo position
Montevideo1,383,13534° 54' 12"S56° 11' 17"W
Las Piedras69,68234° 43' 35"S56° 13' 12"W
Mercedes42,35933° 15' 9"S58° 1' 50"W
San José de Mayo36,52934° 20' 15"S56° 42' 49"W
Pando24,04734° 43' 0"S55° 57' 0"W
Fray Bentos23,27933° 7' 57"S58° 17' 44"W
Colonia del Sacramento21,71434° 27' 45"S57° 50' 23"W
La Paz19,91334° 45' 42"S56° 13' 25"W
Canelones19,69834° 31' 22"S56° 16' 40"W
Delta del Tigre17,97334° 45' 54"S56° 21' 52"W
Carmelo16,92134° 0' 1"S58° 17' 2"W
Santa Lucía16,43834° 27' 12"S56° 23' 26"W
Progreso15,97334° 39' 54"S56° 13' 10"W
Young15,92432° 40' 60"S57° 37' 60"W
Dolores15,88033° 31' 48"S58° 13' 1"W
Paso de Carrasco15,39334° 51' 37"S56° 3' 8"W
Juan L. Lacaze13,22334° 25' 60"S57° 25' 0"W
Nueva Helvecia10,05434° 17' 60"S57° 13' 60"W
Nueva Palmira9,33533° 52' 60"S58° 25' 0"W
Libertad9,31134° 37' 60"S56° 37' 9"W
Rosario9,30834° 19' 0"S57° 21' 0"W
Colonia Nicolich8,90234° 48' 47"S56° 2' 41"W
San Ramón7,00834° 17' 60"S55° 58' 0"W
Joaquín Suárez6,25734° 44' 1"S56° 2' 12"W
Tarariras6,06934° 15' 56"S57° 37' 7"W
Sauce5,91034° 38' 49"S56° 3' 46"W
Tala4,94934° 21' 0"S55° 46' 0"W
Barra de Carrasco4,82434° 52' 38"S56° 1' 47"W
Cardona4,71233° 52' 60"S57° 22' 60"W
Atlántida4,66934° 46' 19"S55° 45' 30"W

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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