Climate - Bissau (Guinea Bissau)

The climate of Bissau is tropical, with a dry season from November to May, and a rainy season from June to October due to the African monsoon. Although the rainy season is quite short, the rains are particularly abundant, especially in August.
During the day it is hot all year round, but from December to February, nights are quite cool, plus the humidity is quite low.
In the dry period, the Harmattan, the dry and dust-laden wind from the Sahara, can blow.
The city is the capital of Guinea-Bissau and is located on the coast, near the estuary of the Geba River. In front of the coast there are several islands.

Bissau - Climate data

In Bissau, the average temperature of the coldest month (January) is of 25.8 °C (78.5 °F), that of the warmest month (May) is of 28.8 °C (83.9 °F). Here are the average temperatures.
In Bissau, precipitation amounts to 2015 millimeters (79.3 inches) per year: it is therefore abundant. It ranges from 0 mm (0 in) in the driest month (March) to 680 mm (26.8 in) in the wettest one (August). Here is the average precipitation.
At Bissau, the sea temperature ranges from 24 °C (75 °F) in February, March to 28.5 °C (83 °F) in July, October, November. Here are the average sea temperatures.
In Bissau, there are on average around 2555 sunshine hours per year. Here are the average hours of sunshine per day.

Bissau - Weather by month

Based on the period 1991-2020

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In January, the least warm month of the year, the weather in Bissau is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.8 °C (79 °F), with a minimum of 18.9 °C (66 °F) and a maximum of 32.8 °C (91.1 °F).
On the coldest nights of the month, the temperature usually drops to around 15.5 °C (60.5 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (96.5 °F).
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 11 hours and 30 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 36%.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 25 °C (77 °F). Therefore, the sea is warm enough for swimming.

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In February, the weather in Bissau is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 27.2 °C (81 °F), with a minimum of 19.6 °C (67.4 °F) and a maximum of 34.8 °C (94.7 °F).
On the coldest nights of the month, the temperature usually drops to around 16.5 °C (62 °F).
On the warmest days of the month, the temperature usually reaches around 38 °C (100 °F).
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 11 hours and 50 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 38%.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 24 °C (75.5 °F). Therefore, the sea is warm enough for swimming.

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In March, the weather in Bissau is usually very hot. However, there are remarkable differences between night and day. The average temperature is of 28.4 °C (83 °F), with a minimum of 21.2 °C (70.2 °F) and a maximum of 35.5 °C (95.9 °F).
On the coldest nights, the temperature usually drops to around 19 °C (65.5 °F).
On the warmest days, the temperature usually reaches around 39 °C (102.5 °F).
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 12 hours and 5 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 74% of the time.
The average humidity is 49%.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 24 °C (75 °F). Therefore, the sea is warm enough for swimming.

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In April, the weather in Bissau is usually very hot. However, there are remarkable differences between night and day. The average temperature is of 28.8 °C (84 °F), with a minimum of 22.2 °C (71.9 °F) and a maximum of 35.4 °C (95.7 °F).
On the coldest nights, the temperature usually drops to around 19.5 °C (67 °F).
On the warmest days, the temperature usually reaches around 39.5 °C (103.5 °F).
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 72% of the time.
The average humidity is 54%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 24.5 °C (75.5 °F). Therefore, the sea is warm enough for swimming.

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In May, the hottest month of the year, the weather in Bissau is usually very hot. The average temperature is of 28.8 °C (84 °F), with a minimum of 23.4 °C (74.2 °F) and a maximum of 34.2 °C (93.6 °F).
On the coldest nights, the temperature usually drops to around 21 °C (70 °F).
On the warmest days, the temperature usually reaches around 38 °C (100 °F).
Precipitation amounts to 17 mm (0.7 in), distributed over 2 days.
The day lasts on average 12 hours and 40 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 61%.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 26 °C (79 °F). Therefore, the sea is warm enough for swimming.

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In June, the weather in Bissau is usually very hot and muggy. The average temperature is of 28.8 °C (84 °F), with a minimum of 24.8 °C (76.6 °F) and a maximum of 32.9 °C (91.2 °F).
On the coldest nights, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days, the temperature usually reaches around 36.5 °C (97.5 °F).
Precipitation amounts to 175 mm (6.9 in), distributed over 11 days.
The day lasts on average 12 hours and 50 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 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 July, the weather in Bissau is usually very hot and muggy. The average temperature is of 27.6 °C (82 °F), with a minimum of 24.5 °C (76.1 °F) and a maximum of 30.7 °C (87.3 °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 34 °C (93 °F).
Precipitation amounts to 470 mm (18.5 in), distributed over 22 days.
The day lasts on average 12 hours and 40 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 32% of the time.
The average humidity is 81%. 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 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In August, the weather in Bissau is usually warm to hot and muggy. The average temperature is of 27.0 °C (81 °F), with a minimum of 24.2 °C (75.6 °F) and a maximum of 29.8 °C (85.7 °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 32.5 °C (91 °F).
Precipitation amounts to 680 mm (26.8 in), distributed over 24 days.
The day lasts on average 12 hours and 30 minutes.
There are on average 3 hours of sunshine per day. So, the sun shines 24% of the time.
The average humidity is 85%. 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 September, the weather in Bissau is usually very hot and muggy. The average temperature is of 27.6 °C (82 °F), with a minimum of 24.4 °C (75.8 °F) and a maximum of 30.9 °C (87.6 °F).
On the coldest nights, the temperature usually drops to around 22 °C (71.5 °F).
On the warmest days, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 435 mm (17.1 in), distributed over 21 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 41% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 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 October, the weather in Bissau is usually very hot and muggy. The average temperature is of 28.6 °C (83 °F), with a minimum of 24.8 °C (76.7 °F) and a maximum of 32.3 °C (90.2 °F).
On the coldest nights, the temperature usually drops to around 22 °C (72 °F).
On the warmest days, the temperature usually reaches around 34.5 °C (94 °F).
Precipitation amounts to 195 mm (7.7 in), distributed over 13 days.
The day lasts on average 11 hours and 50 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 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 November, the weather in Bissau is usually very hot. The average temperature is of 28.3 °C (83 °F), with a minimum of 23.7 °C (74.6 °F) and a maximum of 32.9 °C (91.2 °F).
On the coldest nights, the temperature usually drops to around 20 °C (67.5 °F).
On the warmest days, the temperature usually reaches around 35 °C (94.5 °F).
Precipitation amounts to 40 mm (1.6 in), distributed over 2 days.
The day lasts on average 11 hours and 35 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 64%.
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 December, the weather in Bissau is usually warm to hot. The average temperature is of 26.2 °C (79 °F), with a minimum of 20 °C (68 °F) and a maximum of 32.4 °C (90.3 °F).
On the coldest nights of the month, the temperature usually drops to around 17 °C (62.5 °F).
On the warmest days of the month, the temperature usually reaches around 35 °C (95 °F).
Precipitation amounts to only 2 mm (0.1 in), distributed over 0 days.
The day lasts on average 11 hours and 25 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 48%.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 27 °C (81 °F). Therefore, the sea is pleasantly warm and allows long swims.