Monmouth weather in September 2025

Expect daytime maximum temperatures of 64°F in Monmouth, Wales 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 3.1 inches of rainfall in the month.

  • 64°F maximum daytime temperature in September in Monmouth64
    64°F max day temperature
  • 4 hours of sunshine per day
  • 14 days with some rainfall in September in Monmouth14
    14 days with some rainfall
  • 48°F minimum night-time temperature in September in Monmouth48
    48°F 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
  • 3.1 inches monthly rainfall in September in Monmouth3.1
    3.1 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Monmouth4
    4 (Moderate) UV index

More about Monmouth

Monmouth by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Wales

Parkdean Resorts: February 2026 half term breaks from £99

  • Enjoy UK holidays at February half term 2026
  • Pay just £99 for 3 night stays at UK holiday parks
  • Book longer stays from £179 - 7 night stays
Go to Parkdean Resorts deal >>

View all Parkdean Resorts offers

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)  |  Imperial (°F)

Back to top

More about Wales

How hot is it in Monmouth in September?

Daytime temperatures usually reach 64°F in Monmouth in September, falling to 48°F 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 3.1 inches.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^