Monmouth weather in September 2025

Expect daytime maximum temperatures of 18°C in Monmouth in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 14 days with some rainfall and typically 78 mm of rainfall in the month.

  • 18°C maximum daytime temperature in September in Monmouth18
    18°C max day temperature
  • 4 hours of sunshine per day
  • 14 days with some rainfall in September in Monmouth14
    14 days with some rainfall
  • 9°C minimum night-time temperature in September in Monmouth9
    9°C min night temperature
  • 13 hours of daylight per day in September in Monmouth13
    13 hours of daylight per day
  • No heat & humidity in September in Monmouth0
    No heat & humidity
  • 78 mm monthly rainfall in September in Monmouth78
    78 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Monmouth4
    4 (Moderate) UV index

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The September weather guide for Wales (Monmouth) 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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How hot is it in Monmouth in September?

Daytime temperatures usually reach 18°C in Monmouth in September, falling to 9°C at night.

How sunny is it in Monmouth in September?

There are normally 4 hours of bright sunshine each day in Monmouth in September - that's 35% of daylight hours.

Does it rain in Monmouth in September?

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

Monmouth September sunrise & sunset times

Browse the sunrise and sunset times for Monmouth in September 2025. Select a month to view Monmouth 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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