Roseau weather in September 2025

Expect 31°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Roseau in September. Check more long-term weather averages for Roseau in September before you book your next holiday to Dominica in 2025/2026.

  • 31°C maximum daytime temperature in September in Roseau31
    31°C max day temperature
  • 7 hours of sunshine per day
  • 23 days with some rainfall in September in Roseau23
    23 days with some rainfall
  • 23°C minimum night-time temperature in September in Roseau23
    23°C min night temperature
  • 12 hours of daylight per day in September in Roseau12
    12 hours of daylight per day
  • Very high heat & humidity in September in RoseauVH
    Very High heat & humidity
  • 250 mm monthly rainfall in September in Roseau250
    250 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Roseau11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Roseau29
    29°C sea temperature

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The September weather guide for Dominica (Roseau) 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 Roseau in September?

Daytime temperatures usually reach 31°C in Roseau in September with very high heat and humidity, falling to 23°C at night.

How sunny is it in Roseau in September?

There are normally 7 hours of bright sunshine each day in Roseau in September - that's 59% of daylight hours.

How warm is the sea around Roseau in September?

The average sea temperature around Roseau in September is 29°C.

Does it rain in Roseau in September?

There are usually 23 days with some rain in Roseau in September and the average monthly rainfall is 250mm.

What is the chance of a hurricane in Roseau in September?

On average 1.2 days in September in Roseau are likely to be affected by the passage of one or more tropical storms.

Roseau September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:53 18:18
Monday, 15th September 2025 05:54 18:07
Tuesday, 30th September 2025 05:55 17:55

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