São Luís weather in March

March is one of the least pleasant months in São Luís: highs of 28°C (83°F) and about 322 mm (12.7 in) of rain on average. Nights average 25°C (76°F) and cloud cover 82% (NASA POWER, 2001–2025 averages). The sea averages 30°C (86°F). It is the 2nd wettest month of the year and the 2nd coolest. Compared with February, it is about as warm and wetter; April brings highs of 28°C (82°F) and 357 mm (14.1 in) of rain.

Is March a good time to visit São Luís?

least pleasant month Weather score 34/100.

March is one of the least pleasant months for weather in São Luís. For better conditions, consider Jul–Dec.

See São Luís's sky and forecast now

Does it rain a lot in São Luís in March?

Yes, it is one of the rainy months: about 322 mm (12.7 in) falls in an average March. It is the 2nd wettest month of the year.

How warm is São Luís in March?

Days average 28°C (83°F) and nights 25°C (76°F).

São Luís weather by month

Month	High	Low	Rain	Cloud	Sea	Weather
January	30°C (85°F)	25°C (76°F)	191 mm	73%	30°C (85°F)	fair
February	29°C (83°F)	25°C (76°F)	247 mm	81%	30°C (86°F)	least pleasant
March	28°C (83°F)	25°C (76°F)	322 mm	82%	30°C (86°F)	least pleasant
April	28°C (82°F)	25°C (77°F)	357 mm	82%	30°C (86°F)	least pleasant
May	28°C (83°F)	25°C (77°F)	238 mm	67%	31°C (87°F)	least pleasant
June	29°C (84°F)	25°C (76°F)	149 mm	50%	30°C (87°F)	fair
July	29°C (84°F)	24°C (76°F)	88 mm	38%	30°C (86°F)	best
August	31°C (87°F)	24°C (76°F)	23 mm	26%	30°C (85°F)	best
September	32°C (89°F)	25°C (76°F)	23 mm	25%	29°C (84°F)	best
October	31°C (89°F)	25°C (77°F)	15 mm	34%	29°C (84°F)	best
November	31°C (88°F)	25°C (78°F)	17 mm	46%	29°C (84°F)	best
December	31°C (87°F)	25°C (78°F)	47 mm	58%	29°C (84°F)	best

Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated Oct 31, 2026. How we rate months