São Luis Weather & Climate: Best Time to Visit

The climate in São Luis is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 29°C (84°F) in August, the warmest time of the year, to a moderate 16°C (61°F) during cooler months like January.

At night, you can expect temperatures ranging from 17°C (63°F) in August to around 8°C (46°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, São Luis receives mid-range precipitation levels, with 537 mm (21 in) annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives moderate rainfall, averaging 75 mm (3 in) of precipitation, recorded across 12 rainy days. In contrast, the driest month July brings less rainfall, with 2.6 mm (0.1 in) over a single rainy day. For more details, please visit our São Luis Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in São Luis. While July receives considerable daily sunshine with up to 12.4 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.2 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in São Luis.

The city experiences its highest humidity in December, reaching 77%. In July, the humidity drops to its lowest level at 57%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year