Barmouth weather in September 2025

Expect daytime maximum temperatures of 16°C in Barmouth 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 161 mm of rainfall in the month.

  • 16°C maximum daytime temperature in September in Barmouth16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Barmouth16
    16 days with some rainfall
  • 9°C minimum night-time temperature in September in Barmouth9
    9°C min night temperature
  • 13 hours of daylight per day in September in Barmouth13
    13 hours of daylight per day
  • No heat & humidity in September in Barmouth0
    No heat & humidity
  • 161 mm monthly rainfall in September in Barmouth161
    161 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Barmouth4
    4 (Moderate) UV index
  • 16°C sea temperature in September in Barmouth16
    16°C sea temperature

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The September weather guide for Wales (Barmouth) 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 Barmouth in September?

Daytime temperatures usually reach 16°C in Barmouth in September, falling to 9°C at night.

How sunny is it in Barmouth in September?

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

How warm is the sea around Barmouth in September?

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

Does it rain in Barmouth in September?

There are usually 16 days with some rain in Barmouth in September and the average monthly rainfall is 161mm.

Barmouth September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:27 19:04
Monday, 15th September 2025 05:51 18:31
Tuesday, 30th September 2025 06:16 17:55

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