Climate averages 1991–2020
Rio Grande weather
in May.
A mild, wet month: the 8th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Rio Grande: daytime highs average 18.6°C and nights cool to about 15.8°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 104 mm of rain on roughly 10 days, which makes May a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 30 min on an average May day.
The nearest other city in this atlas is Pelotas (37 km away). In May its highs average 19.3°C, 0.7°C warmer than Rio Grande, with 105 mm of rain.
Among the 448 cities listed in Brazil, Rio Grande ranks joint 442nd of 448 for the warmest May highs and joint 309th of 448 for the driest May (rainfall, lowest first). The mean May high of those 448 cities is 25.3°C; Rio Grande is 6.7°C cooler than that mean.
From May to June, average highs fall by 2.4°C to 16.1°C, and monthly rainfall rises from 104 mm to 110 mm.
The annual picture
May in context
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, selected | 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
May in nearby cities
- Pelotas in MayBrazil · 37 kmHigh 19.3°C · Low 13.8°C · 105 mm rain
- Bagé in MayBrazil · 206 kmHigh 19.2°C · Low 11.3°C · 100 mm rain
- Guaíba in MayBrazil · 226 kmHigh 21.1°C · Low 13.3°C · 107 mm rain
- Cachoeira do Sul in MayBrazil · 235 kmHigh 20.6°C · Low 12.3°C · 120 mm rain
- Porto Alegre in MayBrazil · 238 kmHigh 21.1°C · Low 13.2°C · 107 mm rain
- Viamão in MayBrazil · 240 kmHigh 20.6°C · Low 13.4°C · 106 mm rain
- Alvorada in MayBrazil · 246 kmHigh 21.1°C · Low 13.3°C · 106 mm rain
- Canoas in MayBrazil · 251 kmHigh 21.1°C · Low 13.1°C · 107 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rio Grande) is explained once on the Rio Grande year overview and on the Sources, method and limits page.