Isle of Arran weather in September 2025

Expect 14°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Isle of Arran in September based on long-term weather averages. There is usually 21 days with some rainfall and 172 mm of average monthly rainfall in September.

  • 14°C maximum daytime temperature in September in Isle of Arran14
    14°C max day temperature
  • 3 hours of sunshine per day
  • 21 days with some rainfall in September in Isle of Arran21
    21 days with some rainfall
  • 8°C minimum night-time temperature in September in Isle of Arran8
    8°C min night temperature
  • 13 hours of daylight per day in September in Isle of Arran13
    13 hours of daylight per day
  • No heat & humidity in September in Isle of Arran0
    No heat & humidity
  • 172 mm monthly rainfall in September in Isle of Arran172
    172 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Isle of Arran3
    3 (Moderate) UV index
  • 14°C sea temperature in September in Isle of Arran14
    14°C sea temperature

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The September weather guide for Scotland (Isle of Arran) 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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More about Scotland

How warm is it in Isle of Arran in September?

Daytime temperatures usually reach 14°C in Isle of Arran in September, falling to 8°C at night.

How sunny is it in Isle of Arran in September?

There are normally 3 hours of bright sunshine each day in Isle of Arran in September - that's 27% of daylight hours.

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

The average sea temperature around Isle of Arran in September is 14°C.

Does it rain in Isle of Arran in September?

There are usually 21 days with some rain in Isle of Arran in September and the average monthly rainfall is 172mm.

Isle of Arran September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 19:14
Monday, 15th September 2025 05:53 18:38
Tuesday, 30th September 2025 06:22 17:58

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