Builth Wells weather in September 2026

Expect daytime maximum temperatures of 16°C in Builth Wells, 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 111 mm of rainfall in the month.

  • 16°C maximum daytime temperature in September in Builth Wells16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Builth Wells16
    16 days with some rainfall
  • 8°C minimum night-time temperature in September in Builth Wells8
    8°C min night temperature
  • 13 hours of daylight per day in September in Builth Wells13
    13 hours of daylight per day
  • No heat & humidity in September in Builth Wells0
    No heat & humidity
  • 111 mm monthly rainfall in September in Builth Wells111
    111 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Builth Wells4
    4 (Moderate) UV index

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The September weather guide for Wales (Builth Wells) 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 hot is it in Builth Wells in September?

Daytime temperatures usually reach 18°C in Builth Wells in September, falling to 10°C at night.

How sunny is it in Builth Wells in September?

There are normally 5 hours of bright sunshine each day in Builth Wells in September - that's 37% of daylight hours.

How warm is the sea around Builth Wells in September?

The average sea temperature around Builth Wells in September is 17°C.

Does it rain in Builth Wells in September?

There are usually 15 days with some rain in Builth Wells in September and the average monthly rainfall is 91mm.

Builth Wells September sunrise & sunset times

Browse the sunrise and sunset times for Builth Wells in September 2026. Select a month to view Builth Wells sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:25 19:01
Tuesday, 15th September 2026 05:48 18:29
Wednesday, 30th September 2026 06:13 17:53

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