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Climate - Cotonou (Benin)


Average weather, temperature, rainfall, sunshine hours

Flag - Benin

Cotonou, where it is located


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Climate chart - Cotonou
Cotonou's climate is tropical, with a hotter, dry season from December to February and a rainy season from mid-March to October, during which there is a break in August.
The city is located in southern Benin, on the coast of the Gulf of Guinea.
The harmattan, the dust-laden wind, blows in the dry period, but less often than in the north-central of the country.

Cotonou - Climate data


In Cotonou, the average temperature of the coldest month (August) is of 26.1 °C (79.0 °F), that of the warmest month (March) is of 29.4 °C (85.0 °F). Here are the average temperatures.
Cotonou - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January243228768982.4
February263229.2799084.6
March273229.4809085
April263229.1799084.4
May253128.4788983.1
June243027.1768580.7
July242926.4768379.5
August242826.1758379
September242926.6768480
October243027.3768681.1
November253228.4778983.1
December253228.5779083.2
Year2530.727.87787.382

In Cotonou, precipitation amounts to 1310 millimeters (51.6 inches) per year: it is therefore quite abundant. It ranges from 10 mm (0.4 in) in the driest month (January) to 355 mm (14 in) in the wettest one (June). Here is the average precipitation.
Cotonou - Average precipitation
MonthMillimetersInchesDays
January100.41
February351.42
March7534
April1355.37
May1957.711
June3551415
July1455.78
August652.65
September1003.98
October1254.98
November401.64
December200.82
Year131051.675

At Cotonou, the sea temperature ranges from 25.5 °C (78 °F) in August to 29 °C (84 °F) in March, April, May. Here are the average sea temperatures.
Cotonou - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January27.582
February28.583
March2984
April2984
May2984
June2882
July2679
August25.578
September2679
October27.582
November28.584
December28.583
Year27.781.9

In Cotonou, there are on average around 2345 sunshine hours per year. Here are the average hours of sunshine per day.
Cotonou - Sunshine hours
MonthAverageTotal
January7215
February7.5210
March7225
April7.5220
May7215
June4.5140
July4.5135
August5150
September5.5165
October6.5210
November8245
December7225
Year6.42345

Cotonou - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


In January, the weather in Cotonou 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 (88.9 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (68.5 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 10 mm (0.4 in), and all occurs in one day.
The day lasts on average 11 hours and 50 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 27.5 °C (81.5 °F). Therefore, the sea is pleasantly warm and allows long swims.



In February, the weather in Cotonou is usually very hot and muggy. The average temperature is of 29.2 °C (85 °F), with a minimum of 26.1 °C (78.9 °F) and a maximum of 32.3 °C (90.2 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days of the month, the temperature usually reaches around 34.5 °C (93.5 °F).
Precipitation amounts to 35 mm (1.4 in), distributed over 2 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 28.5 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.



In March, the hottest month of the year, the weather in Cotonou is usually very hot and muggy. The average temperature is of 29.4 °C (85 °F), with a minimum of 26.5 °C (79.7 °F) and a maximum of 32.4 °C (90.2 °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 34 °C (93.5 °F).
Precipitation amounts to 75 mm (3 in), distributed over 4 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 60% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.



In April, the weather in Cotonou is usually very hot and muggy. The average temperature is of 29.1 °C (84 °F), with a minimum of 26.2 °C (79.1 °F) and a maximum of 32.1 °C (89.8 °F).
On the coldest nights, the temperature usually drops to around 22 °C (72 °F).
On the warmest days, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 135 mm (5.3 in), distributed over 7 days.
The day lasts on average 12 hours and 20 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.



In May, the weather in Cotonou is usually very hot and muggy. The average temperature is of 28.4 °C (83 °F), with a minimum of 25.4 °C (77.7 °F) and a maximum of 31.4 °C (88.6 °F).
On the coldest nights, the temperature usually drops to around 22 °C (72 °F).
On the warmest days, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 195 mm (7.7 in), distributed over 11 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 29 °C (84.5 °F). Therefore, the sea is pleasantly warm and allows long swims.



In June, the weather in Cotonou is usually warm to hot and muggy. The average temperature is of 27.1 °C (81 °F), with a minimum of 24.4 °C (76 °F) and a maximum of 29.7 °C (85.5 °F).
On the coldest nights, the temperature usually drops to around 21.5 °C (71 °F).
On the warmest days, the temperature usually reaches around 32 °C (89.5 °F).
Precipitation amounts to 355 mm (14 in), distributed over 15 days.
The day lasts on average 12 hours and 30 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 38% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 28 °C (82 °F). Therefore, the sea is pleasantly warm and allows long swims.



In July, the weather in Cotonou is usually warm to hot and muggy. The average temperature is of 26.4 °C (79 °F), with a minimum of 24.2 °C (75.6 °F) and a maximum of 28.5 °C (83.3 °F).
On the coldest nights of the month, the temperature usually drops to around 21.5 °C (71 °F).
On the warmest days of the month, the temperature usually reaches around 30.5 °C (86.5 °F).
Precipitation amounts to 145 mm (5.7 in), distributed over 8 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 26 °C (79 °F). Therefore, the sea is warm enough for swimming.



In August, the least warm month of the year, the weather in Cotonou is usually warm to hot and muggy. The average temperature is of 26.1 °C (79 °F), with a minimum of 24 °C (75.2 °F) and a maximum of 28.2 °C (82.8 °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 29.5 °C (85 °F).
Precipitation amounts to 65 mm (2.6 in), distributed over 5 days.
The day lasts on average 12 hours and 20 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 25.5 °C (77.5 °F). Therefore, the sea is warm enough for swimming.



In September, the weather in Cotonou is usually warm to hot and muggy. The average temperature is of 26.6 °C (80 °F), with a minimum of 24.2 °C (75.6 °F) and a maximum of 29 °C (84.3 °F).
On the coldest nights, the temperature usually drops to around 22 °C (71 °F).
On the warmest days, the temperature usually reaches around 31 °C (88 °F).
Precipitation amounts to 100 mm (3.9 in), distributed over 8 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 17 kph (10 mph).
The average sea temperature is of 26 °C (79 °F). Therefore, the sea is warm enough for swimming.



In October, the weather in Cotonou is usually warm to hot and muggy. The average temperature is of 27.3 °C (81 °F), with a minimum of 24.4 °C (76 °F) and a maximum of 30.2 °C (86.3 °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 32 °C (90 °F).
Precipitation amounts to 125 mm (4.9 in), distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 27.5 °C (81.5 °F). Therefore, the sea is pleasantly warm and allows long swims.



In November, the weather in Cotonou is usually very hot and muggy. The average temperature is of 28.4 °C (83 °F), with a minimum of 25.2 °C (77.4 °F) and a maximum of 31.6 °C (88.9 °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 33.5 °C (92 °F).
Precipitation amounts to 40 mm (1.6 in), distributed over 4 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 82%. Hence, the air is normally humid.
The average wind speed is 12 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.



In December, the weather in Cotonou is usually very hot and muggy. The average temperature is of 28.5 °C (83 °F), with a minimum of 25 °C (76.9 °F) and a maximum of 32 °C (89.5 °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 33.5 °C (92.5 °F).
Precipitation amounts to 20 mm (0.8 in), distributed over 2 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 61% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 12 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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