Climate and monthly weather forecast
São Luís, Brazil

The best time to visit São Luís

The best months for a swim in São Luís, Brazil, are August through December, with a perfect temperature - varying between 25°C (77°F) and 29°C (84.2°F), and scarce rainfall.

Weather in January

January, like December, is another hot summer month in São Luís, Brazil, with an average temperature ranging between min 23.5°C (74.3°F) and max 30°C (86°F). In São Luís, the average high-temperature in January is relatively the same as in December - a still tropical 30°C (86°F). Weather in January »

Weather in February

February, the last month of the summer in São Luís, is also a moderately hot month, with an average temperature ranging between max 29.4°C (84.9°F) and min 23.1°C (73.6°F). February and March, with an average high-temperature of 29.4°C (84.9°F), are the coldest months. The average heat index in February is appraised at a sweltering 37.9°C (100.2°F). Weather in February »

Weather in March

The first month of the autumn, March, is also a moderately hot month in São Luís, Brazil, with an average temperature ranging between min 23°C (73.4°F) and max 29.4°C (84.9°F). February and March, with an average high-temperature of 29.4°C (84.9°F), are the coldest months. In March, the average heat index is appraised at a torrid 38.2°C (100.8°F). Weather in March »

Weather in April

April, the same as March, is another warm autumn month in São Luís, Brazil, with an average temperature fluctuating between 23.1°C (73.6°F) and 29.6°C (85.3°F). In April, the average high-temperature is relatively the same as in March - a still moderately hot 29.6°C (85.3°F). Weather in April »

Weather in May

The last month of the autumn, May, is a hot month in São Luís, Brazil, with temperature in the range of an average high of 30.1°C (86.2°F) and an average low of 23.1°C (73.6°F). In São Luís, the average high-temperature in May is practically the same as in April - a hot 30.1°C (86.2°F). Weather in May »

Weather in June

The first month of the winter, June, is still a tropical month in São Luís, Brazil, with an average temperature ranging between min 22.9°C (73.2°F) and max 30.4°C (86.7°F). In June, the average high-temperature is almost the same as in May - a still hot 30.4°C (86.7°F). Weather in June »

Weather in July

July, the same as June, in São Luís, Brazil, is another tropical winter month, with temperature in the range of an average low of 22.6°C (72.7°F) and an average high of 30.2°C (86.4°F). In July, the average high-temperature is essentially the same as in June - a still tropical 30.2°C (86.4°F). Weather in July »

Weather in August

August, the last month of the winter in São Luís, is also a hot month, with an average temperature varying between 30.7°C (87.3°F) and 23°C (73.4°F). The ideal sea water temperature of 27.8°C (82°F) and only 4 rainfall days, with 29.4mm (1.16") of accumulated rainfall, makes August the best time for swimming and other water activities. Weather in August »

Weather in September

September, the first month of the spring in São Luís, is still a hot month, with an average temperature ranging between max 31°C (87.8°F) and min 23.5°C (74.3°F). An excellent water temperature of 27.3°C (81.1°F) and only 2 rainfall days, with 23.3mm (0.92") of accumulated rainfall, makes September a prime for swimming and other water activities. Weather in September »

Weather in October

October, like September, is a hot spring month in São Luís, Brazil, with an average temperature ranging between min 23.7°C (74.7°F) and max 31.2°C (88.2°F). The ideal sea water temperature of 27.5°C (81.5°F) and only 1 rainfall days, with 7.6mm (0.3") of accumulated rainfall, makes October the best time for swimming and other water activities. Weather in October »

Weather in November

The last month of the spring, November, is another hot month in São Luís, Brazil, with temperature in the range of an average low of 24°C (75.2°F) and an average high of 31.4°C (88.5°F). An excellent water temperature of 27.8°C (82°F) and only 1 rainfall days, with 10.5mm (0.41") of accumulated rainfall, makes November a prime for swimming and other water activities. Weather in November »

Weather in December

December, the first month of the summer in São Luís, is still a tropical month, with an average temperature ranging between max 31.1°C (88°F) and min 24°C (75.2°F). An excellent water temperature of 28.1°C (82.6°F) and only 4 rainfall days, with 77.4mm (3.05") of accumulated rainfall, makes December a prime for swimming and other water activities. Weather in December »
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FAQ

How many days does it rain in São Luís?

In São Luís, Brazil, during the entire year, the rain falls for 130 days and collects up to 2290.2mm (90.17") of precipitation.

What is the month with the highest UV index in São Luís?

January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index.

What is the coldest month in São Luís?

The coldest months in São Luís are February and March, with an average high-temperature of 29.4°C (84.9°F).

When is the sea warmest in São Luís?

The month with the warmest seawater is March, with an average sea temperature of 28.9°C (84°F).

What is the month with the least sunshine in São Luís?

The month with the least sunshine in São Luís, Brazil, is March, with an average of 3.5h of sunshine.

What is the most humid month in São Luís?

With an average relative humidity of 90%, April is the most humid month in São Luís.

What is the wettest month in São Luís?

The month with the most rainfall in São Luís is April, when the rain falls for 22 days and typically aggregates up to 475.9mm (18.74") of precipitation.

What is the month with the shortest days in São Luís?

The month with the shortest days in São Luís is June, with an average of 11h and 59min of daylight.

What are the months with the lowest UV index in São Luís?

The months with the lowest UV index are June and July, with an average maximum UV index of 10.

What month has the most sunshine in São Luís?

August has the most sunshine of the year in São Luís, with an average of 8.4h of sunshine.

When is the sea coldest in São Luís?

With an average sea temperature of 27.3°C (81.1°F), September is the month with the coldest seawater in São Luís.

What is the driest month in São Luís?

October is the month with the least rainfall in São Luís. Rain falls for 1 days and accumulates 7.6mm (0.3") of precipitation.

What is the warmest month in São Luís?

With an average high-temperature of 31.4°C (88.5°F) and an average low-temperature of 24°C (75.2°F), November is the warmest month in São Luís, Brazil.

What is the least humid month in São Luís?

With an average relative humidity of 71%, December is the least humid month.

When are the longest days in São Luís?

The month with the longest days in São Luís is December, with an average of 12h and 16min of daylight.

Is there Daylight Saving Time (DST) in São Luís?

São Luís, Brazil, does not observe Daylight Saving Time (DST). -03 timezone is used over the entire year.

Average temperature
São Luís, Brazil

Average temperature - São Luís, Brazil

The warmest month (with the highest average high temperature) is November (31.4°C).
The months with the lowest average high temperature are February and March (29.4°C).

The months with the highest average low temperature are November and December (24°C).
The coldest month (with the lowest average low temperature) is July (22.6°C).

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Average humidity
São Luís, Brazil

Average humidity - São Luís, Brazil

The month with the highest relative humidity is April (90%).
The month with the lowest relative humidity is December (71%).

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Average rainfall
São Luís, Brazil

Average rainfall - São Luís, Brazil

The wettest month (with the highest rainfall) is April (475.9mm).
The driest month (with the least rainfall) is October (7.6mm).

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Average rainfall days
São Luís, Brazil

Average rainfall days - São Luís, Brazil

The month with the highest number of rainy days is March (23 days).
The months with the least rainy days are October and November (1 days).

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Average sea temperature
São Luís, Brazil

Average sea temperature - São Luís, Brazil

The best month for swimming (with the highest average sea temperature) is March (28.9°C).
The coldest month (with the lowest average sea temperature) is September (27.3°C).

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Average daylight / Average sunshine
São Luís, Brazil

Average daylight / Average sunshine - São Luís, Brazil

The month with the longest days is December (Average daylight: 12h and 16min).
The month with the shortest days is June (Average daylight: 11h and 59min).

The month with the most sunshine is August (Average sunshine: 8h and 24min).
The month with the least sunshine is March (Average sunshine: 3h and 30min).

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Average UV index
São Luís, Brazil

Average UV index - São Luís, Brazil

The months with the highest UV index are January, February, March, April, September, October, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 10).

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