Rio Grande climate
Rio Grande (Rio Grande do Sul, Brazil) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 19 °C66 °F, and about 1,327 mm52 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Rio Grande climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2678 | 2272 | 2475 | 1014.0 |
| Feb | 2678 | 2272 | 2475 | 1174.6 |
| Mar | 2576 | 2171 | 2373 | 1174.6 |
| Apr | 2272 | 1966 | 2169 | 1164.6 |
| May | 1966 | 1661 | 1864 | 1104.3 |
| Jun | 1662 | 1356 | 1559 | 1084.3 |
| Jul | 1559 | 1253 | 1356 | 1164.6 |
| Aug | 1661 | 1254 | 1457 | 1064.2 |
| Sep | 1763 | 1456 | 1559 | 1315.2 |
| Oct | 1967 | 1661 | 1864 | 1265.0 |
| Nov | 2271 | 1864 | 2068 | 883.5 |
| Dec | 2475 | 2068 | 2271 | 913.6 |
| Year | 2678 | 1253 | 1966 | 1,32752 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 78% | 49% | 6.9 | 14:01 |
| Feb | 77% | 52% | 6.2 | 13:16 |
| Mar | 78% | 50% | 5.1 | 12:22 |
| Apr | 78% | 50% | 3.9 | 11:20 |
| May | 81% | 58% | 2.8 | 10:30 |
| Jun | 84% | 59% | 2.3 | 10:04 |
| Jul | 85% | 58% | 2.5 | 10:14 |
| Aug | 86% | 57% | 3.1 | 10:58 |
| Sep | 85% | 59% | 4.1 | 11:57 |
| Oct | 83% | 59% | 5.3 | 12:57 |
| Nov | 79% | 51% | 6.6 | 13:49 |
| Dec | 78% | 50% | 7.1 | 14:14 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Rio Grande is like
The warmest month is February, with an average high of 26 °C78 °F and a low of 22 °C72 °F. The coldest is July, when highs average 15 °C59 °F and lows 12 °C53 °F. There is a clear seasonal cycle, with 10.7 °C19.2 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,327 mm52 in of precipitation per year. Rain is spread fairly evenly through the year. The wettest month is September (131 mm5.2 in), the driest is November (88 mm3.5 in).
Relative humidity ranges from 77% in February to 86% in August. The clearest skies (lowest average cloud amount, 49%) are typical of January. Average wind speed near the ground ranges from 16 km/h (10 mph) in June to 18 km/h (11 mph) in October. Daylight lasts from about 10.1 hours in June to 14.2 hours in December.
Best time to visit Rio Grande
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–January: average highs of 22 °C71 °F to 26 °C78 °F with 88 mm3.5 in to 101 mm4.0 in of precipitation per month.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Rio Grande
- Summer (December–February) — highs 2475 to 26 °C78 °F, lows 2068 to 22 °C72 °F, about 103 mm4.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Autumn (March–May) — highs 1966 to 25 °C76 °F, lows 1661 to 21 °C71 °F, about 114 mm4.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
- Winter (June–August) — highs 1559 to 16 °C62 °F, lows 1253 to 13 °C56 °F, about 110 mm4.3 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Spring (September–November) — highs 1763 to 22 °C71 °F, lows 1456 to 18 °C64 °F, about 115 mm4.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Rio Grande compares
Compared with Pelotas, about 37 km to the northwest, Rio Grande is on average 0.4 °C0.7 °F warmer and receives a similar amount of precipitation. The difference is largest in May (1.5 °C2.7 °F warmer).
Of the 223 places in Brazil covered by World Climates, Rio Grande is the 212th warmest by annual mean temperature and the 104th wettest by annual precipitation. See all of them on the Brazil climate page.
Places in other countries with the most similar temperature and rainfall pattern: Newcastle (Australia, Cfa), Nowra (Australia, Cfa) and Buenos Aires (Argentina, Cfa).
Nearby places
- Pelotas 37 km · 18 °C65 °F · 1,343 mm53 in
- Bagé 206 km · 17 °C63 °F · 1,481 mm58 in
- Porto Alegre 238 km · 19 °C67 °F · 1,446 mm57 in
- Canoas 251 km · 19 °C67 °F · 1,446 mm57 in
- Gravataí 255 km · 19 °C67 °F · 1,446 mm57 in
- Santa Cruz do Sul 260 km · 20 °C68 °F · 1,590 mm63 in
- Novo Hamburgo 278 km · 20 °C68 °F · 1,574 mm62 in
- Santa Maria 308 km · 19 °C67 °F · 1,692 mm67 in
Frequently asked questions
What is the warmest month in Rio Grande?
February is the warmest month in Rio Grande, with an average high of 26 °C (78 °F) and an average low of 22 °C (72 °F).
What is the coldest month in Rio Grande?
July is the coldest month, with an average high of 15 °C (59 °F) and an average low of 12 °C (53 °F).
When does it rain the most in Rio Grande?
September is the wettest month with about 131 mm (5.2 in) of precipitation; November is the driest with about 88 mm (3.5 in).
What is the best time to visit Rio Grande?
Judging by long-term averages, the most comfortable months are November–January.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.