Isle of Man weather in September 2025

Expect 15°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Isle of Man in September. Check more long-term weather averages for Isle of Man in September before you book your next holiday to Isle of Man in 2025/2026.

  • 15°C maximum daytime temperature in September in Isle of Man (Douglas)15
    15°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Isle of Man (Douglas)16
    16 days with some rainfall
  • 10°C minimum night-time temperature in September in Isle of Man (Douglas)10
    10°C min night temperature
  • 13 hours of daylight per day in September in Isle of Man (Douglas)13
    13 hours of daylight per day
  • No heat & humidity in September in Isle of Man (Douglas)0
    No heat & humidity
  • 142 mm monthly rainfall in September in Isle of Man (Douglas)142
    142 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Isle of Man (Douglas)3
    3 (Moderate) UV index
  • 15°C sea temperature in September in Isle of Man (Douglas)15
    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 the Isle of Man in September?

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

How sunny is it in the Isle of Man in September?

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

How warm is the sea around the Isle of Man in September?

The average sea temperature around Douglas, Isle of Man in September is 15°C.

Does it rain in the Isle of Man in September?

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

Isle of Man September sunrise & sunset times

Browse the sunrise and sunset times for Isle of Man in September 2025. Select a month to view Isle of Man sunrise and sunset times for the next 12 months. The Isle of Man sunrise and sunset times shown below are for Douglas.

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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