Douglas weather in September 2025

Expect daytime maximum temperatures of 15°C in Douglas, Isle of Man in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 16 days with some rainfall and typically 142 mm of rainfall in the month.

  • 15°C maximum daytime temperature in September in Douglas15
    15°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Douglas16
    16 days with some rainfall
  • 10°C minimum night-time temperature in September in Douglas10
    10°C min night temperature
  • 13 hours of daylight per day in September in Douglas13
    13 hours of daylight per day
  • No heat & humidity in September in Douglas0
    No heat & humidity
  • 142 mm monthly rainfall in September in Douglas142
    142 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Douglas3
    3 (Moderate) UV index
  • 15°C sea temperature in September in Douglas15
    15°C sea temperature

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The September weather guide for Isle of Man, represented by Douglas, (Douglas) 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 warm is it in Douglas in September?

Daytime temperatures usually reach 15°C in Douglas in September, falling to 10°C at night.

How sunny is it in Douglas in September?

There are normally 4 hours of bright sunshine each day in Douglas in September - that's 33% of daylight hours.

How warm is the sea around Douglas in September?

The average sea temperature around Douglas in September is 15°C.

Does it rain in Douglas in September?

There are usually 16 days with some rain in Douglas in September and the average monthly rainfall is 142mm.

Douglas September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 19:08
Monday, 15th September 2025 05:51 18:34
Tuesday, 30th September 2025 06:18 17:56

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