São Luís
Brazil
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
São Luís, Brazil

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.

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

The last month of the summer, February, is also a moderately hot month in São Luís, Brazil, with average temperature varying between 29.4°C (84.9°F) and 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. In February, the average heat index is calculated to a very hot 37.9°C (100.2°F). Weather in February »

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

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

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 is essentially the same as in April - a hot 30.1°C (86.2°F). Weather in May »

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

July, the same as June, in São Luís, Brazil, is another hot 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 São Luís, Brazil, the average high-temperature in July is almost the same as in June - a still tropical 30.2°C (86.4°F). Weather in July »

August, the last month of the winter, in São Luís, is another tropical month, with temperature in the range of an average low of 23°C (73.4°F) and an average high of 30.7°C (87.3°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 »

The first month of the spring, September, is still a tropical month in São Luís, Brazil, with temperature in the range of an average low of 23.5°C (74.3°F) and an average high of 31°C (87.8°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 »

October, the same as September, in São Luís, Brazil, is another hot spring month, with average temperature varying between 31.2°C (88.2°F) and 23.7°C (74.7°F). An excellent water temperature of 27.5°C (81.5°F) and only 1 rainfall days, with 7.6mm (0.3") of accumulated rainfall, makes October a prime for swimming and other water activities. Weather in October »

November, the last month of the spring, in São Luís, is another hot month, with average temperature varying between 24°C (75.2°F) and 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 »

December, the first month of the summer, in São Luís, is also a hot month, with temperature in the range of an average low of 24°C (75.2°F) and an average high of 31.1°C (88°F). The perfect water temperature of 28.1°C (82.6°F) with 77.4mm (3.05") of accumulated rainfall and only 4 rainfall days, makes December a great period for swimming and other water activities. Weather in December »

How many days does it rain in São Luís?

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

When are the longest days in São Luís?

January and December, with an average of 12.3h of daylight, are months with the longest days in São Luís.

When is the highest UV index in São Luís?

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

What are the coldest months in São Luís?

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

What month is the sea warmest in São Luís?

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

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

March has the least sunshine of the year in São Luís, with an average of 3.5h of sunshine.

What is the most humid month in São Luís?

April is the most humid month, with an average relative humidity of 90%.

What is the rainiest month in São Luís?

April is the month with the most rainfall. Rain falls for 22 days and accumulates 475.9mm (18.74") of precipitation.

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

Months with the shortest days in São Luís are May through August, with an average of 12h of daylight.

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

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

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.

What month is the sea coldest in São Luís?

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

What is the driest month in São Luís?

The month with the least rainfall is October when the rain falls for 1 days and typically collects 7.6mm (0.3") of precipitation.

What is the warmest month in São Luís?

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

What is the least humid month in São Luís?

The least humid month is December, with an average relative humidity of 71%.
Average temperature - São Luís, Brazil
Average humidity - 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).

Average rainfall days - 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).

Average daylight / Average sunshine - São Luís, Brazil

Months with the longest days are January and December (Average daylight: 12.3h).
Months with the shortest days are May, June, July and August (Average daylight: 12h).

The month with the most sunshine is August (Average sunshine: 8.4h).
The month with the least sunshine is March (Average sunshine: 3.5h).

Average UV index - São Luís, Brazil

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