Colwyn Bay weather in September 2025

Expect daytime maximum temperatures of 16°C in Colwyn Bay, Wales in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 16 days with some rainfall and typically 105 mm of rainfall in the month.

  • 16°C maximum daytime temperature in September in Colwyn Bay16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Colwyn Bay16
    16 days with some rainfall
  • 10°C minimum night-time temperature in September in Colwyn Bay10
    10°C min night temperature
  • 13 hours of daylight per day in September in Colwyn Bay13
    13 hours of daylight per day
  • No heat & humidity in September in Colwyn Bay0
    No heat & humidity
  • 105 mm monthly rainfall in September in Colwyn Bay105
    105 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Colwyn Bay4
    4 (Moderate) UV index
  • 16°C sea temperature in September in Colwyn Bay16
    16°C sea temperature

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The September weather guide for Wales (Colwyn Bay) 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 Colwyn Bay in September?

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

How sunny is it in Colwyn Bay in September?

There are normally 4 hours of bright sunshine each day in Colwyn Bay in September - that's 32% of daylight hours.

How warm is the sea around Colwyn Bay in September?

The average sea temperature around Colwyn Bay in September is 16°C.

Does it rain in Colwyn Bay in September?

There are usually 16 days with some rain in Colwyn Bay in September and the average monthly rainfall is 105mm.

Colwyn Bay September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:25 19:04
Monday, 15th September 2025 05:49 18:30
Tuesday, 30th September 2025 06:15 17:54

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