Cotonou Weather in September

With daytime temperatures of 28°C (82°F) and nighttime lows of 24°C (75°F), September in Cotonou brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 134 mm (5.3 in) falls on average.

Rainfall in Cotonou in September

Typically, you can expect about 11 days of rain this month, with 134 mm (5.3 in) on average. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Cotonou in September

Expect highs of 28°C (82°F) in Cotonou in September, with nights dropping to around 24°C (75°F). Overall, the month follows a fairly predictable daily temperature pattern. At 24°C (75°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.

Sunshine in Cotonou in September

The area enjoys a moderate level of sunlight, with around 165 hours. It's a good balance between sunny and cloudy days.

Wind Speed in Cotonou in September

Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.

Average water temperature in September

At 24°C (75°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

For Cotonou itself, August generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Benin, check out our Cotonou's climate page.

Cotonou Temperature in September

Min Temperature 24°C (75°F)  

Max Temperature 28°C (82°F)  

Water Temperature 24°C (75°F)  

Chance of Rain 38%  

Precipitation 134 mm (5.3 in)  

Rainy days 11 days  

Humidity 85%  

Windspeed 5 m/s (10 knots)  

Sunshine 165 hours  

Percentage Sunshine  

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in Cotonou typically stay consistent throughout September, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 24°C (75°F).

Average temperatures in September

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Daily Historical Precipitation

49-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Cotonou in September

Browse day-by-day weather records for Cotonou spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Cotonou historical weather extremes in September

The extremes listed below come from historical weather data collected in Cotonou from 2004 through 2025.

• On September 7, 2020, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
• The coldest September day was on September 5, 2007, with a maximum of 25°C (77°F).
• Nighttime temperatures dropped to 21°C (70°F) on September 7, 2007, marking the coldest September night on record.

What to Wear in Cotonou in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 24°C (75°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Cotonou in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Benin, check out our Cotonou's climate page.

More climate data for Cotonou

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Cotonou climate overview or explore weather in Benin.