Climate averages 1991–2020
Porto Alegre weather
in March.
A warm, wet month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a warm month in Porto Alegre: daytime highs average 27.5°C and nights cool to about 19.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 111 mm of rain on roughly 12 days, which makes March a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 17 min on an average March day.
The nearest other city in this atlas is Guaíba (13 km away). In March its highs average 27.6°C, about as warm as Porto Alegre, with 111 mm of rain.
Among the 448 cities listed in Brazil, Porto Alegre ranks joint 255th of 448 for the warmest March highs and joint 67th of 448 for the driest March (rainfall, lowest first). The mean March high of those 448 cities is 27.9°C; Porto Alegre is 0.4°C cooler than that mean.
From March to April, average highs fall by 2.6°C to 24.9°C, and monthly rainfall falls from 111 mm to 106 mm.
The annual picture
March 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
Porto Alegre climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.2°C20.6°C | 20.6°C | 137 | 14.0 | 13.814 h |
| February | 28.8°C20.6°C | 20.6°C | 128 | 13.5 | 13.213 h |
| March, selected | 27.5°C19.3°C | 19.3°C | 111 | 11.9 | 12.312 h |
| April | 24.9°C16.5°C | 16.5°C | 106 | 9.2 | 11.411 h |
| May | 21.1°C13.2°C | 13.2°C | 107 | 9.2 | 10.611 h |
| June | 19.0°C10.8°C | 10.8°C | 113 | 9.2 | 10.210 h |
| July | 18.4°C9.8°C | 9.8°C | 140 | 10.0 | 10.410 h |
| August | 20.6°C11.0°C | 11.0°C | 120 | 10.2 | 11.011 h |
| September | 21.6°C12.8°C | 12.8°C | 146 | 11.1 | 11.912 h |
| October | 23.8°C15.2°C | 15.2°C | 170 | 12.4 | 12.813 h |
| November | 26.0°C16.8°C | 16.8°C | 122 | 10.9 | 13.614 h |
| December | 28.4°C19.2°C | 19.2°C | 124 | 11.8 | 14.014 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
March in nearby cities
- Guaíba in MarchBrazil · 13 kmHigh 27.6°C · Low 19.6°C · 111 mm rain
- Canoas in MarchBrazil · 14 kmHigh 27.5°C · Low 19.2°C · 111 mm rain
- Alvorada in MarchBrazil · 15 kmHigh 27.3°C · Low 19.5°C · 121 mm rain
- Viamão in MarchBrazil · 21 kmHigh 26.8°C · Low 19.5°C · 121 mm rain
- Gravataí in MarchBrazil · 25 kmHigh 27.3°C · Low 19.0°C · 121 mm rain
- São Leopoldo in MarchBrazil · 31 kmHigh 27.3°C · Low 18.8°C · 128 mm rain
- Novo Hamburgo in MarchBrazil · 41 kmHigh 26.9°C · Low 18.1°C · 128 mm rain
- Sapiranga in MarchBrazil · 49 kmHigh 27.2°C · Low 18.6°C · 132 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 Porto Alegre) is explained once on the Porto Alegre year overview and on the Sources, method and limits page.
Canoas and Guaíba lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.