São Luís Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit São Luís.
Climate overview of São Luís
São Luís, Maranhão, Brazil, enjoys a steady climate throughout the year, with daytime temperatures typically around 30°C (86°F). August is the warmest month at 31°C (88°F), while March is the coolest at 29°C (84°F).
With around 2171 mm (85 in) of annual rainfall, São Luís has a notably wet climate. However, this rainfall is not evenly distributed, the city has distinct dry (August to November) and wet (January to May) seasons. The wettest month is March. The sunniest month is August, with 8.7 hours of sunshine per day on average.
São Luís Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in São Luís - and find the best time to visit.
Monthly Temperature in São Luís
The temperature in São Luís remains steady throughout the year, providing a consistently very warm climate. Average daytime temperatures reach a very warm 31°C (88°F) in August. In March, the coolest month of the year, temperatures drop to a comfortable 29°C (84°F).
At night, temperatures range from around 26°C (79°F) in August to 25°C (77°F) in March.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in São Luís
São Luís has a relatively rainy climate with high precipitation levels, averaging 2171 mm (85 in) of rainfall annually. São Luís can be quite wet during March, receiving approximately 434 mm (17 in) of precipitation over 31 rainy days.
In contrast, during the driest month (September), you will experience much drier conditions, with 18 mm (0.7 in) of precipitation spread across 6 rainy days. For more details, please visit our São Luís Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in São Luís
São Luís can be enjoyed more throughout the sunniest month of August under a blue sky, with approximately 8.7 hours of sunshine daily. In contrast, the city experiences much darker days in March, with only 3.6 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in São Luís by Month
The city experiences its highest humidity in April, reaching 90%. In November, the humidity drops to its lowest level at 79%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit São Luís
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September and October
- Warmest weather: all year round
- Most sunshine: August, September and October
- Fewest rainy days: October and November
- Wettest months: January, February, March, April and May, when rainfall is highest.
- Seasonal pattern: Distinct dry (August to November) and wet (January to May) seasons
Frequently asked questions about the climate in São Luís
What is the best time to visit São Luís?
September and October typically offer the most optimal weather in São Luís. In contrast, January, February, March, April and May tend to have less optimal conditions. São Luís has distinct dry (August to November) and wet (January to May) seasons.
What temperatures can I expect in São Luís?
Daytime highs range from 29°C (84°F) in March to 31°C (88°F) in August. Nighttime lows range from 25°C (77°F) to 26°C (79°F). Temperatures stay relatively stable year-round.
How much rain does São Luís get?
Annual rainfall is around 2171 mm (85 in). March is the wettest month with 434 mm (17 in), while September is the driest with 18 mm (0.7 in).
How sunny is São Luís?
São Luís receives around 2,355 hours of sunshine per year. August is the sunniest month with 260 hours, while March is the cloudiest with just 107 hours. Overall, São Luís enjoys abundant sunshine.
São Luís 3-Day Forecast
São Luís on the map
São Luís is highlighted - select any city to see its climate.
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