Chepstow weather in September 2025

Expect 18°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Chepstow in September based on long-term weather averages. There is usually 14 days with some rainfall and 78 mm of average monthly rainfall in September.

  • 18°C maximum daytime temperature in September in Chepstow18
    18°C max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in September in Chepstow14
    14 days with some rainfall
  • 10°C minimum night-time temperature in September in Chepstow10
    10°C min night temperature
  • 13 hours of daylight per day in September in Chepstow13
    13 hours of daylight per day
  • No heat & humidity in September in Chepstow0
    No heat & humidity
  • 78 mm monthly rainfall in September in Chepstow78
    78 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Chepstow4
    4 (Moderate) UV index

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

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

How sunny is it in Chepstow in September?

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

Does it rain in Chepstow in September?

There are usually 14 days with some rain in Chepstow in September and the average monthly rainfall is 78mm.

Chepstow September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:23 18:57
Monday, 15th September 2025 05:46 18:25
Tuesday, 30th September 2025 06:10 17:50

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