Climate averages 1991–2020
São Luís weather
in April.
A hot, very wet month: the joint 10th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a hot month in São Luís: daytime highs average 28.3°C and nights cool to about 24.3°C. By daytime temperature it is the joint 10th warmest of the 12 months.
Expect about 414 mm of rain on roughly 29 days, which makes April a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 03 min on an average April day.
The nearest other city in this atlas is São José de Ribamar (27 km away). In April its highs average 28.1°C, about as warm as São Luís, with 437 mm of rain.
Among the 448 cities listed in Brazil, São Luís ranks joint 147th of 448 for the warmest April highs and 438th of 448 for the driest April (rainfall, lowest first). The mean April high of those 448 cities is 27.0°C; São Luís is 1.3°C warmer than that mean.
From April to May, average highs rise by 0.5°C to 28.8°C, and monthly rainfall falls from 414 mm to 286 mm.
The annual picture
April 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 | 28.1°C24.2°C | 24.2°C | 440 | 30.3 | 12.112 h |
| April, selected | 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
April in nearby cities
- São José de Ribamar in AprilBrazil · 27 kmHigh 28.1°C · Low 24.6°C · 437 mm rain
- Pinheiro in AprilBrazil · 87 kmHigh 29.2°C · Low 23.4°C · 367 mm rain
- Chapadinha in AprilBrazil · 171 kmHigh 29.5°C · Low 22.9°C · 312 mm rain
- Santa Inês in AprilBrazil · 174 kmHigh 29.4°C · Low 23.4°C · 310 mm rain
- Bacabal in AprilBrazil · 197 kmHigh 29.6°C · Low 23.3°C · 265 mm rain
- Codó in AprilBrazil · 219 kmHigh 29.4°C · Low 22.9°C · 263 mm rain
- Caxias in AprilBrazil · 279 kmHigh 29.6°C · Low 22.9°C · 282 mm rain
- Parnaíba in AprilBrazil · 284 kmHigh 29.2°C · Low 24.7°C · 268 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.