Arklow weather in September 2025

Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Arklow in September. Check more long-term weather averages for Arklow in September before you book your next holiday to Ireland in 2025/2026.

  • 17°C maximum daytime temperature in September in Arklow17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Arklow16
    16 days with some rainfall
  • 10°C minimum night-time temperature in September in Arklow10
    10°C min night temperature
  • 13 hours of daylight per day in September in Arklow13
    13 hours of daylight per day
  • No heat & humidity in September in Arklow0
    No heat & humidity
  • 87 mm monthly rainfall in September in Arklow87
    87 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Arklow4
    4 (Moderate) UV index
  • 15°C sea temperature in September in Arklow15
    15°C sea temperature

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The September weather guide for Ireland (Arklow) 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 Arklow in September?

Daytime temperatures usually reach 17°C in Arklow in September, falling to 10°C at night.

How sunny is it in Arklow in September?

There are normally 4 hours of bright sunshine each day in Arklow in September - that's 35% of daylight hours.

How warm is the sea around Arklow in September?

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

Does it rain in Arklow in September?

There are usually 16 days with some rain in Arklow in September and the average monthly rainfall is 87mm.

Arklow September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:35 19:13
Monday, 15th September 2025 05:59 18:40
Tuesday, 30th September 2025 06:24 18:04

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