Iona weather in September 2025

Expect 15°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Iona in September based on long-term weather averages. There is usually 20 days with some rainfall and 176 mm of average monthly rainfall in September.

  • 15°C maximum daytime temperature in September in Iona15
    15°C max day temperature
  • 3 hours of sunshine per day
  • 20 days with some rainfall in September in Iona20
    20 days with some rainfall
  • 10°C minimum night-time temperature in September in Iona10
    10°C min night temperature
  • 13 hours of daylight per day in September in Iona13
    13 hours of daylight per day
  • No heat & humidity in September in Iona0
    No heat & humidity
  • 176 mm monthly rainfall in September in Iona176
    176 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Iona3
    3 (Moderate) UV index
  • 14°C sea temperature in September in Iona14
    14°C sea temperature

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The September weather guide for Scotland (Iona) 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 Iona in September?

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

How sunny is it in Iona in September?

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

How warm is the sea around Iona in September?

The average sea temperature around Iona in September is 14°C.

Does it rain in Iona in September?

There are usually 20 days with some rain in Iona in September and the average monthly rainfall is 176mm.

Iona September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:30 19:20
Monday, 15th September 2025 05:57 18:43
Tuesday, 30th September 2025 06:27 18:03

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