Cotonou weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Cotonou in September. Check more long-term weather averages for Cotonou in September before you book your next holiday to Benin in 2025/2026.

  • 29°C maximum daytime temperature in September in Cotonou29
    29°C max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in September in Cotonou11
    11 days with some rainfall
  • 23°C minimum night-time temperature in September in Cotonou23
    23°C min night temperature
  • 12 hours of daylight per day in September in Cotonou12
    12 hours of daylight per day
  • Moderate heat & humidity in September in CotonouM
    Moderate heat & humidity
  • 112 mm monthly rainfall in September in Cotonou112
    112 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Cotonou11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in Cotonou26
    26°C sea temperature

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The September weather guide for Benin (Cotonou) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Cotonou in September?

Daytime temperatures usually reach 29°C in Cotonou in September with moderate heat and humidity, falling to 23°C at night.

How sunny is it in Cotonou in September?

There are normally 5 hours of bright sunshine each day in Cotonou in September - that's 42% of daylight hours.

How warm is the sea around Cotonou in September?

The average sea temperature around Cotonou in September is 26°C.

Does it rain in Cotonou in September?

There are usually 11 days with some rain in Cotonou in September and the average monthly rainfall is 112mm.

Cotonou September sunrise & sunset times

Browse the sunrise and sunset times for Cotonou in September 2025. Select a month to view Cotonou sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:43 18:57
Monday, 15th September 2025 06:41 18:50
Tuesday, 30th September 2025 06:38 18:42

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