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São Luís Weather by Month
Average temperatures, rainfall and humidity for São Luís, Brazil, month by month, built from OpenWeather’s historical records. Use it to see what a typical São Luís month looks like before you travel — then check the live São Luís forecast for the days ahead.
Warmest month
October
32°C average high
Coolest month
March
25°C average low
Wettest month
March
138 mm of rain
Driest month
October
5 mm of rain
Average temperature and rainfall in São Luís by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 31°C | 25°C | 21°C / 36°C | 73 mm | 79% | 15 km/h |
| February | 30°C | 25°C | 22°C / 36°C | 101 mm | 84% | 13 km/h |
| March | 30°C | 25°C | 20°C / 34°C | 138 mm | 85% | 11 km/h |
| April | 31°C | 25°C | 22°C / 34°C | 120 mm | 86% | 10 km/h |
| May | 31°C | 25°C | 23°C / 35°C | 87 mm | 84% | 10 km/h |
| June | 31°C | 25°C | 22°C / 35°C | 39 mm | 80% | 11 km/h |
| July | 31°C | 25°C | 22°C / 34°C | 27 mm | 78% | 12 km/h |
| August | 32°C | 25°C | 23°C / 35°C | 25 mm | 75% | 16 km/h |
| September | 32°C | 26°C | 23°C / 35°C | 6 mm | 72% | 20 km/h |
| October | 32°C | 26°C | 22°C / 39°C | 5 mm | 70% | 21 km/h |
| November | 32°C | 26°C | 17°C / 36°C | 22 mm | 71% | 20 km/h |
| December | 32°C | 26°C | 22°C / 36°C | 25 mm | 72% | 19 km/h |
Best time to visit São Luís
The most comfortable time to visit São Luís is generally July and September to October, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around March, totalling about 669 mm a year.
Travellers who prefer heat should aim for October, when highs average 32°C. March is the month to avoid if rain would spoil your plans — it averages 138 mm, roughly 27× the rainfall of the driest month (October).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the São Luís forecast for what is happening now.
Weather across Brazil right now
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