Holyhead weather in September 2025

Expect 17°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Holyhead in September. Check more long-term weather averages for Holyhead in September before you book your next holiday to Wales in 2025/2026.

  • 17°C maximum daytime temperature in September in Holyhead17
    17°C max day temperature
  • 5 hours of sunshine per day
  • 16 days with some rainfall in September in Holyhead16
    16 days with some rainfall
  • 11°C minimum night-time temperature in September in Holyhead11
    11°C min night temperature
  • 13 hours of daylight per day in September in Holyhead13
    13 hours of daylight per day
  • No heat & humidity in September in Holyhead0
    No heat & humidity
  • 77 mm monthly rainfall in September in Holyhead77
    77 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Holyhead4
    4 (Moderate) UV index
  • 15°C sea temperature in September in Holyhead15
    15°C sea temperature

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The September weather guide for Wales (Holyhead) 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 Wales

How warm is it in Holyhead in September?

Daytime temperatures usually reach 17°C in Holyhead in September, falling to 11°C at night.

How sunny is it in Holyhead in September?

There are normally 5 hours of bright sunshine each day in Holyhead in September - that's 36% of daylight hours.

How warm is the sea around Holyhead in September?

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

Does it rain in Holyhead in September?

There are usually 16 days with some rain in Holyhead in September and the average monthly rainfall is 77mm.

Holyhead September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:28 19:07
Monday, 15th September 2025 05:52 18:34
Tuesday, 30th September 2025 06:19 17:57

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