Climate - Sao Luís (Maranhão)

The climate of São Luís is tropical, with a rainy season from late December to July and a dry season from August to November.
The city is the capital of the state of Maranhão and is located in the north-east of Brazil, on an island near the coast, the island of Upaon-açu (or São Luís). On the island there are also the cities of São José de Ribamar, Paço do Lumiar, and Raposa. In the area, there are branches of some rivers that flow into the sea, the main one being the Mearim River. To the east is the Lençóis Maranhenses National Park, characterized by a surreal landscape, where sand dunes rise over a lagoon.

Best Time

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The best time to visit São Luís is from August to November, being the driest and sunniest of the year.

Sao Luís - Climate data

In Sao Luís, the average temperature of the coldest month (March) is of 27.5 °C (81.5 °F), that of the warmest month (November) is of 29.1 °C (84.4 °F). Here are the average temperatures.
In Sao Luís, precipitation amounts to 2290 millimeters (90.2 inches) per year: it is therefore abundant. It ranges from 8 mm (0.3 in) in the driest month (October) to 475 mm (18.7 in) in the wettest one (April). Here is the average precipitation.
At Sao Luís, the sea temperature ranges from 27 °C (81 °F) in September to 28.5 °C (83 °F) in February, March, April, May, June. Here are the average sea temperatures.
In Sao Luís, there are on average around 2315 sunshine hours per year. Here are the average hours of sunshine per day.

Sao Luís - Weather by month

Based on the period 1991-2020

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In January, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 28.1 °C (83 °F), with a minimum of 24.8 °C (76.7 °F) and a maximum of 31.4 °C (88.4 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (72 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92 °F).
Precipitation amounts to 245 mm (9.6 in), distributed over 13 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In February, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 27.7 °C (82 °F), with a minimum of 24.4 °C (76 °F) and a maximum of 31 °C (87.8 °F).
On the coldest nights of the month, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days of the month, the temperature usually reaches around 33 °C (91.5 °F).
Precipitation amounts to 375 mm (14.8 in), distributed over 17 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 33% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 28.5 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In March, the least warm month of the year, the weather in Sao Luís is usually warm to hot and muggy. The average temperature is of 27.5 °C (82 °F), with a minimum of 24.3 °C (75.8 °F) and a maximum of 30.7 °C (87.2 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72 °F).
On the warmest days, the temperature usually reaches around 32.5 °C (90.5 °F).
Precipitation amounts to 430 mm (16.9 in), distributed over 23 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In April, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 27.6 °C (82 °F), with a minimum of 24.4 °C (75.9 °F) and a maximum of 30.9 °C (87.6 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (73 °F).
On the warmest days, the temperature usually reaches around 32.5 °C (91 °F).
Precipitation amounts to 475 mm (18.7 in), distributed over 22 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 32% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In May, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 28.0 °C (82 °F), with a minimum of 24.5 °C (76.1 °F) and a maximum of 31.4 °C (88.5 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days, the temperature usually reaches around 33.5 °C (92 °F).
Precipitation amounts to 315 mm (12.4 in), distributed over 20 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In June, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 28.0 °C (82 °F), with a minimum of 24.4 °C (76 °F) and a maximum of 31.6 °C (89 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72 °F).
On the warmest days, the temperature usually reaches around 33 °C (91.5 °F).
Precipitation amounts to 175 mm (6.9 in), distributed over 13 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 28.5 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In July, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 28.0 °C (82 °F), with a minimum of 24.4 °C (75.9 °F) and a maximum of 31.6 °C (88.8 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (73 °F).
On the warmest days of the month, the temperature usually reaches around 33 °C (91.5 °F).
Precipitation amounts to 130 mm (5.1 in), distributed over 10 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 64% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 28 °C (82 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In August, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 28.4 °C (83 °F), with a minimum of 24.8 °C (76.6 °F) and a maximum of 32.1 °C (89.7 °F).
On the coldest nights of the month, the temperature usually drops to around 23 °C (73.5 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 30 mm (1.2 in), distributed over 4 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 27.5 °C (81.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In September, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 28.8 °C (84 °F), with a minimum of 25.2 °C (77.4 °F) and a maximum of 32.4 °C (90.4 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73.5 °F).
On the warmest days, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 25 mm (1 in), distributed over 2 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 27 °C (81 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In October, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 29.0 °C (84 °F), with a minimum of 25.6 °C (78 °F) and a maximum of 32.5 °C (90.5 °F).
On the coldest nights, the temperature usually drops to around 23.5 °C (74.5 °F).
On the warmest days, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to only 8 mm (0.3 in), and all occurs in one day.
The day lasts on average 12 hours and 10 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 67% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 27.5 °C (81 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In November, the hottest month of the year, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 29.1 °C (84 °F), with a minimum of 25.8 °C (78.4 °F) and a maximum of 32.5 °C (90.5 °F).
On the coldest nights, the temperature usually drops to around 23.5 °C (74.5 °F).
On the warmest days, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 10 mm (0.4 in), and all occurs in one day.
The day lasts on average 12 hours and 10 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 67% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 27.5 °C (81.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In December, the hottest month of the year, the weather in Sao Luís is usually very hot and muggy. The average temperature is of 29.0 °C (84 °F), with a minimum of 25.7 °C (78.2 °F) and a maximum of 32.4 °C (90.3 °F).
On the coldest nights of the month, the temperature usually drops to around 23 °C (73.5 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 75 mm (3 in), distributed over 4 days.
The day lasts on average 12 hours and 20 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 54% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 28 °C (82 °F). Therefore, the sea is pleasantly warm and allows long swims.