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São Luís, Brazil climate
As Tropical savanna (dry summer)
São Luís has a remarkably steady tropical climate (Tropical savanna (dry summer), Köppen As). The hottest month is November with an average daily high near 90°F, while the coldest is March averaging around 76°F at night. Precipitation totals about 43 inches a year and is strongly seasonal — April alone averages 8.8 inches while October barely receives 0.07 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)São Luís climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 88 | 87 | 88 | 89 | 89 | 89 | 90 | 90 | 91 | 90 | 90 |
| Avg temp (°F) | 83 | 82 | 82 | 82 | 82 | 82 | 82 | 83 | 84 | 84 | 84 | 84 |
| Avg low (°F) | 77 | 76 | 76 | 76 | 76 | 76 | 76 | 77 | 77 | 78 | 78 | 78 |
| Precipitation (in) | 5.1 | 6.2 | 7.9 | 8.8 | 6.8 | 3.5 | 2.5 | 0.7 | 0.3 | 0.1 | 0.2 | 1.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 88 | 87 | 88 | 89 | 89 |
| Avg temp (°F) | 83 | 82 | 82 | 82 | 82 | 82 |
| Avg low (°F) | 77 | 76 | 76 | 76 | 76 | 76 |
| Precipitation (in) | 5.1 | 6.2 | 7.9 | 8.8 | 6.8 | 3.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 89 | 90 | 90 | 91 | 90 | 90 |
| Avg temp (°F) | 82 | 83 | 84 | 84 | 84 | 84 |
| Avg low (°F) | 76 | 77 | 77 | 78 | 78 | 78 |
| Precipitation (in) | 2.5 | 0.7 | 0.3 | 0.1 | 0.2 | 1.2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 79 | 83 | 80 | 67 | 50 | 40 | 28 | 28 | 37 | 49 | 58 |
| Relative humidity (%) | 83 | 87 | 90 | 91 | 90 | 87 | 84 | 77 | 73 | 72 | 73 | 75 |
| Wind speed (mph) | 3.3 | 3.2 | 3.0 | 2.8 | 2.8 | 2.9 | 2.9 | 3.2 | 3.5 | 3.7 | 3.7 | 3.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 79 | 83 | 80 | 67 | 50 |
| Relative humidity (%) | 83 | 87 | 90 | 91 | 90 | 87 |
| Wind speed (mph) | 3.3 | 3.2 | 3.0 | 2.8 | 2.8 | 2.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 40 | 28 | 28 | 37 | 49 | 58 |
| Relative humidity (%) | 84 | 77 | 73 | 72 | 73 | 75 |
| Wind speed (mph) | 2.9 | 3.2 | 3.5 | 3.7 | 3.7 | 3.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Marechal Cunha Machado Intl, a weather station, about 10 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.