Climate averages 1991–2020
Rio Grande weather
by month.
See how the year changes. February has the highest average daily maximum; February has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: NovemberDecember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Rio Grande averages a daytime high of 20.1°C and a nighttime low of 17.1°C, with about 1,235 mm of rain on roughly 114 days. February is the warmest month (average high 24.9°C) and July the coolest (15.0°C). October is the wettest month with 129 mm; February is the driest with 85 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): November and December. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Rio Grande
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rio Grande climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.6°C21.9°C | 21.9°C | 87 | 8.6 | 14.014 h |
| February | 24.9°C22.3°C | 22.3°C | 85 | 9.8 | 13.213 h |
| March | 24.0°C21.4°C | 21.4°C | 92 | 9.9 | 12.312 h |
| April | 21.7°C18.8°C | 18.8°C | 112 | 10.1 | 11.311 h |
| May | 18.6°C15.8°C | 15.8°C | 104 | 9.8 | 10.511 h |
| June | 16.1°C13.0°C | 13.0°C | 110 | 9.7 | 10.110 h |
| July | 15.0°C11.7°C | 11.7°C | 112 | 10.1 | 10.310 h |
| August | 15.8°C12.5°C | 12.5°C | 108 | 9.6 | 11.011 h |
| September | 16.7°C13.7°C | 13.7°C | 125 | 10.2 | 11.912 h |
| October | 18.9°C16.1°C | 16.1°C | 129 | 10.1 | 12.913 h |
| November | 21.0°C18.0°C | 18.0°C | 87 | 7.7 | 13.714 h |
| December | 23.2°C20.2°C | 20.2°C | 86 | 8.0 | 14.214 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- PelotasBrazil · 37 kmHigh 21.4°C · Low 15.7°C · 1,358 mm rain a year
- BagéBrazil · 206 kmHigh 22.5°C · Low 13.5°C · 1,464 mm rain a year
- GuaíbaBrazil · 226 kmHigh 24.0°C · Low 15.6°C · 1,524 mm rain a year
- Cachoeira do SulBrazil · 235 kmHigh 23.9°C · Low 14.8°C · 1,603 mm rain a year
- Porto AlegreBrazil · 238 kmHigh 24.1°C · Low 15.5°C · 1,524 mm rain a year
- ViamãoBrazil · 240 kmHigh 23.4°C · Low 15.6°C · 1,535 mm rain a year
- AlvoradaBrazil · 246 kmHigh 24.0°C · Low 15.6°C · 1,535 mm rain a year
- CanoasBrazil · 251 kmHigh 24.1°C · Low 15.4°C · 1,524 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -32.00°, -52.00° (10 km from the city centre). Rain comes from the 0.25° cell at -32.00°, -52.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.