Climate averages 1991–2020
São Luís weather
in October.
A hot, very dry month: one of the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a hot month in São Luís: daytime highs average 31.2°C and nights cool to about 25.7°C. By daytime temperature it is one of the warmest months of the year.
Expect about 13 mm of rain on roughly 4 days, which makes October a very dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 10 min on an average October day.
The nearest other city in this atlas is São José de Ribamar (27 km away). In October its highs average 30.0°C, 1.2°C cooler than São Luís, with 15 mm of rain.
Among the 448 cities listed in Brazil, São Luís ranks joint 94th of 448 for the warmest October highs and joint 35th of 448 for the driest October (rainfall, lowest first). The mean October high of those 448 cities is 28.3°C; São Luís is 2.9°C warmer than that mean.
From October to November, average highs fall by 0.2°C to 30.9°C, and monthly rainfall rises from 13 mm to 27 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- São José de Ribamar in OctoberBrazil · 27 kmHigh 30.0°C · Low 25.9°C · 15 mm rain
- Pinheiro in OctoberBrazil · 87 kmHigh 32.7°C · Low 24.6°C · 16 mm rain
- Chapadinha in OctoberBrazil · 171 kmHigh 35.5°C · Low 24.6°C · 12 mm rain
- Santa Inês in OctoberBrazil · 174 kmHigh 34.4°C · Low 24.8°C · 19 mm rain
- Bacabal in OctoberBrazil · 197 kmHigh 35.1°C · Low 25.2°C · 17 mm rain
- Codó in OctoberBrazil · 219 kmHigh 35.4°C · Low 24.7°C · 16 mm rain
- Caxias in OctoberBrazil · 279 kmHigh 36.3°C · Low 24.4°C · 14 mm rain
- Parnaíba in OctoberBrazil · 284 kmHigh 33.6°C · Low 25.2°C · 5.6 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.