São Luís weather and climate in 2025
Day
31 °C
Night
23 °C
Sea
28 °C
Precipitation
31 mm
in month
Rainy days
7 days
in month
Daylight
12 hours
average
Sunshine
8 hours
average
Humidity
82 %
Day
31 °C
Night
23 °C
Sea
28 °C
Precipitation
31 mm
in month
Rainy days
7 days
in month
Daylight
12 hours
average
Sunshine
8 hours
average
Humidity
82 %
Overview: São Luís
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Weather overview for São Luís
Weather overview
São Luís (Brazil) in general has a tropical climate. Temperatures during the day are in the range from 30 °C (86 °F) in March to 32 °C (90 °F) in November. The highest night temperatures could be experienced in December with 24 °C (75 °F), the lowest in July with 23 °C (73 °F). The driest month is October with just 3 days of rain, on the contrary, the month when it rains the most is March with 27 days of rain.
January weather
The day temperature starts to descent, its value is 31 °C (87 °F) in São Luís. The wet season is at its beginning. The number of rainy days rises similarly to the previous month, and the rainfall amount rises similarly to the previous month as well. The number of sun hours (without clouds) continues to descent, its value is 6 hours.
February weather
There is pending wet season in São Luís. The number of rainy days rises similarly to the previous month, its value is 23 days, and the rainfall amount continues to rise as well, with its value of 312 mm (12.28 in). The number of sun hours (without clouds) continues to descent, with its value being 4 hours.
March weather
The day temperature reaches its minimum, the value of this measure is 30 °C (86 °F) in São Luís. The wet season is taking place. The number of rainy days is on its maximum, the value of this measure is 27 days, while the rainfall amount rises similarly to the previous month. The number of sun hours (without clouds) reaches its minimum, with its value of 4 hours. The minimum of the wind speed can be noticed, the value of this measure is 1.
April weather
The number of rainy days starts to descent, the value of this measure is 26 days in São Luís, while the maximum of the rainfall amount is observable, with its value being 399 mm (15.69 in). There is pending wet season. The number of sun hours (without clouds) starts to rise, with its value being 4 hours. The maximum of the humidity is observable, the value of this measure is 89 %.
May weather
There is pending wet season in May in São Luís. The descent of the number of rainy days can be observed, with its value being 24 days, while the rainfall amount starts to descent, the value of this measure is 310 mm (12.19 in). The number of sun hours (without clouds) continues to rise.
June weather
The number of rainy days descents similarly to the previous month, with its value of 17 days in São Luís, and the descent of the rainfall amount can be observed too, the value of this measure is 153 mm (6.04 in). The day length reaches its minimum in this month. The number of sun hours (without clouds) rises similarly to the previous month, the value of this measure is 7 hours.
July weather
The rainfall amount continues to descent, its value is 132 mm (5.19 in) in São Luís, and the descent of the number of rainy days can be observed as well, with its value being 14 days. The night temperature is on its minimum in this month. The number of sun hours (without clouds) rises similarly to the previous month, the value of this measure is 8 hours.
August weather
The tourist season slowly starts in São Luís, and the dry season is at its beginning as well. The descent of the number of rainy days can be observed, with its value of 7 days, and the rainfall amount descents similarly to the previous month as well, its value is 31 mm (1.20 in). The number of sun hours (without clouds) is on its maximum, with its value of 8 hours.
September weather
The number of rainy days continues to descent, the value of this measure is 4 days in São Luís, and the rainfall amount continues to descent as well, the value of this measure is 18 mm (0.71 in). There is pending tourist season, and the dry season continues as well this month.
October weather
The tourist season is taking place in São Luís, and there is pending dry season too. The minimum of the number of rainy days is observable, its value is 3 days, and the rainfall amount is on its minimum as well, with its value of 10 mm (0.41 in). The maximum of the wind speed is observable in this month.
November weather
The tourist season continues in São Luís, and the dry season is close to its peak too. The maximum of the day temperature can be noticed, its value is 32 °C (90 °F). The humidity reaches its minimum, with its value of 77 %. The number of rainy days rise's start could be observed, with its value of 4 days.
December weather
The tourist season continues in São Luís. The beginning of the rise of the rainfall amount could be noticed, with its value of 71 mm (2.79 in), while the number of rainy days continues to rise, the value of this measure is 9 days. The beginning of the descent of the number of sun hours (without clouds) could be noticed, the value of this measure is 7 hours. The maximum of the day length is observable in December. The maximum of the night temperature is observable.
FAQs
How windy is São Luís in February?
An average wind scale that can be expected in São Luís in February is 1. It is rather a milder or unnoticeable wind, therefore it will not bother you during your holiday.
What is the humidity in São Luís in March?
In March in São Luís, expect humidity around 88 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.
What is the air temperature in São Luís in April at night?
The average night temperature in April in São Luís is 23 °C (74 °F). A very pleasant temperature for long evening walks, fun over a drink outside, or doing sports in the morning. If possible, look for a hotel with air conditioning.
Is there a dry season in May in São Luís?
No, May is not a dry month in São Luís, expect rain approximately 24 days in a month.
Is there a wet season in June in São Luís?
No, there is no wet season in São Luís in June - you can expect 17 days of rain during the month.
How many sunny hours can I expect in São Luís in July?
In São Luís in July, you can expect around 8 hours of sunshine.
Are there good conditions to visit in São Luís in August?
August is one of the best months to visit São Luís. The temperature during the day will be nice 31 °C (88 °F). The seawater temperature reaches ideal 28 °C (82 °F). At night, temperatures hover around a pleasant 23 °C (74 °F). There are only 7 days of rain in the whole month, so you can leave your umbrella at home.
How many days of precipitation on average can I expect in São Luís in September?
There are 4 days, which are rainy in September in São Luís, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 0.9 days of the week, or in general - 13 % days.
What is the sea temperature in São Luís in October?
The temperature of the sea in October in São Luís is 27 °C (81 °F). Seems like an ideal temperature for swimming, you can stay in the sea for a long time and enjoy it as well.
What temperature can I expect during the day in São Luís in November?
In November in São Luís, the average daily temperatures will be 32 °C (90 °F). The great temperature for lying by the sea or pool and sunbathing, everywhere else you will probably be a bit hot. Don't forget to drink during the day, in these temperatures you should hydrate yourself a lot.
Is it hot in December in São Luís?
In São Luís in December, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
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