Weather in Cotonou in September 2025
Average weather
Average temperature in Cotonou in September
The temperature in September is +82°F on average, with a range between a maximum of +84°F during the day and a minimum of +75°F at night.
The average maximum temperature goes up 20% by the end of the month, compared with the beginning of the month, from +82°F to +84°F.
Is Cotonou warm or cold in September?
Cotonou is typically warm in September.
Maximum temperatures go up compared to the previous month from +79°F to +81°F. The minimum temperature also goes up from +75°F to +75°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the coolest months in Cotonou, here is the comparison with other months:
Climate in Cotonou in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +79°F | +81°F | +82°F | ||||
| Min. temperature | ||||||
| +72°F | +73°F | +73°F | ||||
| Max. temperature | ||||||
| +84°F | +86°F | +88°F | ||||
| Rainfall | ||||||
| 80 mm | 111 mm | 109 mm | ||||
| Wind | ||||||
| 5 m/s | 4 m/s | 3 m/s | ||||
| Humidity | ||||||
| 88% | 87% | 85% | ||||
| Air pressure | ||||||
| 1012 HPa | 1012 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 0 | 0 | 0 | ||||
| Cloudy days | ||||||
| 8 | 4 | 2 | ||||
| Rainy days | ||||||
| 22 | 21 | 18 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +79°F to +81°F during the day. Prepare for more rain. Average rainfall goes from 80 mm to 111 mm. It feels drier, as humidity decreases from 88% to 87%. Winds are calmer in comparison to August, going down from 5 m/s to 4 m/s on average. The amount of sunny days stay about the same, averaging 0 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Cotonou is gradually decreasing during September, going from 5 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Cotonou?
Climate Change Over the Years
The climate in Cotonou in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1983 (+82°F) and the highest in 2019 (+85°F). The driest year was 1998 with only 665 mm of rainfall, and the wettest year was 1988 with 1691 mm.
FAQ
Is September a good time to visit Cotonou?
Can you sunbathe in Cotonou in September?
Is Cotonou rainy in September?
Is it sunny in Cotonou in September?
Monthly weather in Cotonou
Source of the data
For this page, we’ve looked at the typical weather in Cotonou, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.