Climate averages 1991–2020
São Luís weather
in August.
A hot, fairly dry month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in São Luís: daytime highs average 30.6°C and nights cool to about 25.3°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 28 mm of rain on roughly 9 days, which makes August a fairly dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average August day.
The nearest other city in this atlas is São José de Ribamar (27 km away). In August its highs average 29.8°C, 0.7°C cooler than São Luís, with 25 mm of rain.
Among the 448 cities listed in Brazil, São Luís ranks joint 76th of 448 for the warmest August highs and joint 182nd of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; São Luís is 4.4°C warmer than that mean.
From August to September, average highs rise by 0.6°C to 31.2°C, and monthly rainfall falls from 28 mm to 11 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- São José de Ribamar in AugustBrazil · 27 kmHigh 29.8°C · Low 25.6°C · 25 mm rain
- Pinheiro in AugustBrazil · 87 kmHigh 30.8°C · Low 23.6°C · 27 mm rain
- Chapadinha in AugustBrazil · 171 kmHigh 33.6°C · Low 23.6°C · 3.8 mm rain
- Santa Inês in AugustBrazil · 174 kmHigh 33.0°C · Low 23.6°C · 11 mm rain
- Bacabal in AugustBrazil · 197 kmHigh 33.9°C · Low 23.9°C · 5.4 mm rain
- Codó in AugustBrazil · 219 kmHigh 34.0°C · Low 23.5°C · 3.7 mm rain
- Caxias in AugustBrazil · 279 kmHigh 34.8°C · Low 23.3°C · 3.0 mm rain
- Parnaíba in AugustBrazil · 284 kmHigh 33.4°C · Low 24.8°C · 2.6 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.