Climate - Cotonou (Benin)

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.

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.
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.
The sea temperature ranges from 25.5 °C (25.5 °F) in August to 29 °C (29 °F) in March, April, May. Here are the average sea temperatures.
On average, there are around 2345 sunshine hours per year. Here are the average sunshine hours per day.

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 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.
On average, there are 215 hours of sunshine per month, i.e. 7 hours per day.
The average humidity is 78%.
The average wind speed is 12 kph (7 kph).
The average sea temperature is of 27.5 °C (81.5 °F).

In February, 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.
On average, there are 210 hours of sunshine per month, i.e. 7.5 hours per day.
The average humidity is 80%.
The average wind speed is 15 kph (9 kph).
The average sea temperature is of 28.5 °C (83 °F).

In March, the warmest month of the year, 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 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 34 °C (93.5 °F).
Precipitation amounts to 75 mm (3 in), distributed over 4 days.
On average, there are 225 hours of sunshine per month, i.e. 7 hours per day.
The average humidity is 80%.
The average wind speed is 16 kph (10 kph).
The average sea temperature is of 29 °C (84 °F).

In April, 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 of the month, the temperature usually drops to around 22 °C (72 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 135 mm (5.3 in), distributed over 7 days.
On average, there are 220 hours of sunshine per month, i.e. 7.5 hours per day.
The average humidity is 81%.
The average wind speed is 15 kph (9 kph).
The average sea temperature is of 29 °C (84 °F).

In May, 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 of the month, the temperature usually drops to around 22 °C (72 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 195 mm (7.7 in), distributed over 11 days.
On average, there are 215 hours of sunshine per month, i.e. 7 hours per day.
The average humidity is 82%.
The average wind speed is 13 kph (8 kph).
The average sea temperature is of 29 °C (84.5 °F).

In June, 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 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 32 °C (89.5 °F).
Precipitation amounts to 355 mm (14 in), distributed over 15 days.
On average, there are 140 hours of sunshine per month, i.e. 4.5 hours per day.
The average humidity is 85%.
The average wind speed is 14 kph (9 kph).
The average sea temperature is of 28 °C (82 °F).

In July, 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.
On average, there are 135 hours of sunshine per month, i.e. 4.5 hours per day.
The average humidity is 87%.
The average wind speed is 17 kph (11 kph).
The average sea temperature is of 26 °C (79 °F).

In August, the coldest month of the year, 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.
On average, there are 150 hours of sunshine per month, i.e. 5 hours per day.
The average humidity is 87%.
The average wind speed is 18 kph (11 kph).
The average sea temperature is of 25.5 °C (77.5 °F).

In September, 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 of the month, the temperature usually drops to around 22 °C (71 °F).
On the warmest days of the month, the temperature usually reaches around 31 °C (88 °F).
Precipitation amounts to 100 mm (3.9 in), distributed over 8 days.
On average, there are 165 hours of sunshine per month, i.e. 5.5 hours per day.
The average humidity is 87%.
The average wind speed is 17 kph (10 kph).
The average sea temperature is of 26 °C (79 °F).

In October, 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 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 °C (90 °F).
Precipitation amounts to 125 mm (4.9 in), distributed over 8 days.
On average, there are 210 hours of sunshine per month, i.e. 6.5 hours per day.
The average humidity is 85%.
The average wind speed is 13 kph (8 kph).
The average sea temperature is of 27.5 °C (81.5 °F).

In November, 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 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 33.5 °C (92 °F).
Precipitation amounts to 40 mm (1.6 in), distributed over 4 days.
On average, there are 245 hours of sunshine per month, i.e. 8 hours per day.
The average humidity is 82%.
The average wind speed is 12 kph (7 kph).
The average sea temperature is of 28.5 °C (83.5 °F).

In December, 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.
On average, there are 225 hours of sunshine per month, i.e. 7 hours per day.
The average humidity is 80%.
The average wind speed is 12 kph (7 kph).
The average sea temperature is of 28.5 °C (83 °F).