Climate averages 1991–2020
São Luís weather
in March.
A hot, very wet month: the coolest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a hot month in São Luís: daytime highs average 28.1°C and nights cool to about 24.2°C. By daytime temperature it is the coolest month of the year.
Expect about 440 mm of rain on roughly 30 days, which makes March a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 07 min on an average March day.
The nearest other city in this atlas is São José de Ribamar (27 km away). In March its highs average 27.9°C, about as warm as São Luís, with 452 mm of rain.
Among the 448 cities listed in Brazil, São Luís ranks joint 210th of 448 for the warmest March highs and 439th of 448 for the driest March (rainfall, lowest first). The mean March high of those 448 cities is 27.9°C; São Luís is 0.2°C warmer than that mean.
From March to April, average highs rise by 0.2°C to 28.3°C, and monthly rainfall falls from 440 mm to 414 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
São Luís climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.0°C24.7°C | 24.7°C | 221 | 25.4 | 12.212 h |
| February | 28.3°C24.4°C | 24.4°C | 305 | 26.3 | 12.212 h |
| March, selected | 28.1°C24.2°C | 24.2°C | 440 | 30.3 | 12.112 h |
| April | 28.3°C24.3°C | 24.3°C | 414 | 28.8 | 12.112 h |
| May | 28.8°C24.6°C | 24.6°C | 286 | 26.9 | 12.012 h |
| June | 29.1°C24.7°C | 24.7°C | 153 | 23.0 | 12.012 h |
| July | 29.3°C24.7°C | 24.7°C | 103 | 20.0 | 12.012 h |
| August | 30.6°C25.3°C | 25.3°C | 28 | 9.0 | 12.012 h |
| September | 31.2°C25.5°C | 25.5°C | 11 | 3.2 | 12.112 h |
| October | 31.2°C25.7°C | 25.7°C | 13 | 3.6 | 12.212 h |
| November | 30.9°C25.7°C | 25.7°C | 27 | 6.8 | 12.212 h |
| December | 30.4°C25.5°C | 25.5°C | 73 | 15.2 | 12.312 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
- São José de Ribamar in MarchBrazil · 27 kmHigh 27.9°C · Low 24.6°C · 452 mm rain
- Pinheiro in MarchBrazil · 87 kmHigh 29.1°C · Low 23.4°C · 368 mm rain
- Chapadinha in MarchBrazil · 171 kmHigh 29.7°C · Low 22.9°C · 300 mm rain
- Santa Inês in MarchBrazil · 174 kmHigh 29.4°C · Low 23.3°C · 341 mm rain
- Bacabal in MarchBrazil · 197 kmHigh 29.6°C · Low 23.2°C · 316 mm rain
- Codó in MarchBrazil · 219 kmHigh 29.4°C · Low 22.9°C · 315 mm rain
- Caxias in MarchBrazil · 279 kmHigh 29.6°C · Low 22.8°C · 345 mm rain
- Parnaíba in MarchBrazil · 284 kmHigh 29.1°C · Low 24.6°C · 265 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 São Luís) is explained once on the São Luís year overview and on the Sources, method and limits page.