Valentia Island weather in September 2025

Expect 16°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Valentia Island in September. Check more long-term weather averages for Valentia Island in September before you book your next holiday to Ireland in 2025/2026.

  • 16°C maximum daytime temperature in September in Valentia Island16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 17 days with some rainfall in September in Valentia Island17
    17 days with some rainfall
  • 10°C minimum night-time temperature in September in Valentia Island10
    10°C min night temperature
  • 13 hours of daylight per day in September in Valentia Island13
    13 hours of daylight per day
  • No heat & humidity in September in Valentia Island0
    No heat & humidity
  • 130 mm monthly rainfall in September in Valentia Island130
    130 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Valentia Island4
    4 (Moderate) UV index
  • 15°C sea temperature in September in Valentia Island15
    15°C sea temperature

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The September weather guide for Ireland (Valentia Island) 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 Ireland

How warm is it in Valentia Island in September?

Daytime temperatures usually reach 16°C in Valentia Island in September, falling to 10°C at night.

How sunny is it in Valentia Island in September?

There are normally 4 hours of bright sunshine each day in Valentia Island in September - that's 29% of daylight hours.

How warm is the sea around Valentia Island in September?

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

Does it rain in Valentia Island in September?

There are usually 17 days with some rain in Valentia Island in September and the average monthly rainfall is 130mm.

Valentia Island September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:54 19:28
Monday, 15th September 2025 06:16 18:56
Tuesday, 30th September 2025 06:41 18:21

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