São Luís weather by month & the best time to visit
Brazil · coastal city break · tropical — wet & dry seasons climate
The best time to visit São Luís is October — its sunniest month (Sunshine Score 90/100), with November and August close behind. São Luís averages about 2,413 hours of sunshine a year. Daytime highs around 31°C / 88°F and roughly 15 mm of rain in October.
When is the best time to visit São Luís?
For sunshine, the best time to visit São Luís is October, then November and August. The dullest month is January (66/100, 191 mm of rain). The full month-by-month picture is in the table below.
How sunny is São Luís?
São Luís gets a moderate 2,413 hours of sunshine a year. October (90/100) is noticeably better than January (66). It ranks #77 of 131 destinations in Brazil for annual sunshine, below the national median of 2,486 hours. Rain has a clear season: the wettest stretch, around March, carries about 54% of the annual 1,717 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 66 | 29° / 84°F | 24° / 75°F | 191 mm | 10 | 30° / 86°F |
| February | 66 | 28° / 82°F | 24° / 75°F | 247 mm | 10 | 30° / 86°F |
| March | 66 | 28° / 82°F | 24° / 75°F | 322 mm | 10 | 30° / 86°F |
| April | 66 | 28° / 82°F | 25° / 77°F | 357 mm | 10 | 31° / 88°F |
| May | 66 | 28° / 82°F | 25° / 77°F | 238 mm | 10 | 31° / 88°F |
| June | 66 | 28° / 82°F | 24° / 75°F | 149 mm | 9 | 31° / 88°F |
| July | 77 | 29° / 84°F | 24° / 75°F | 88 mm | 10 | 30° / 86°F |
| August | 89 | 31° / 88°F | 24° / 75°F | 23 mm | 11 | 30° / 86°F |
| September | 89 | 31° / 88°F | 24° / 75°F | 23 mm | 11 | 29° / 84°F |
| October | 90 | 31° / 88°F | 25° / 77°F | 15 mm | 11 | 29° / 84°F |
| November | 90 | 31° / 88°F | 25° / 77°F | 17 mm | 10 | 29° / 84°F |
| December | 84 | 31° / 88°F | 25° / 77°F | 47 mm | 10 | 29° / 84°F |
Sea temperature in São Luís by month
The sea off São Luís is warmest in April at around 31°C / 88°F, and coolest in September at 29°C / 84°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How São Luís compares month by month: São Luís vs Belém · São Luís vs Teresina · São Luís vs Marabá · São Luís vs Cruz · all comparisons
São Luís: questions and answers
What kind of destination is São Luís?
São Luís is a coastal city break in Brazil with a tropical — wet & dry seasons climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does São Luís get a year?
São Luís gets about 2,413 hours of sunshine a year, at its best around October.
When is the best time to visit São Luís?
The sunniest time to visit São Luís is October, when the Sunshine Score peaks at 90/100 (with November and August close behind). Expect daytime highs around 31°C / 88°F.
What is the least sunny month in São Luís?
January is the least sunny month in São Luís, scoring 66/100 with about 191 mm of rain.
What is the sea temperature in São Luís?
The sea in São Luís ranges from about 29°C (September) to 31°C (April). Month-by-month sea temperatures are on this page.
How strong is the sun in São Luís?
The typical midday UV index in São Luís peaks around 11 (extreme) in August, easing to about 9 (very high) in June. Month-by-month midday UV values are in the UV column of the table on this page.
Put the São Luís sunshine badge on your site
A compact badge showing São Luís's sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: