Cardiff weather in September 2025

Expect 64°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Cardiff in September. Check more long-term weather averages for Cardiff in September before you book your next holiday to Wales in 2025/2026.

  • 64°F maximum daytime temperature in September in Cardiff64
    64°F max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Cardiff15
    15 days with some rainfall
  • 50°F minimum night-time temperature in September in Cardiff50
    50°F min night temperature
  • 13 hours of daylight per day in September in Cardiff13
    13 hours of daylight per day
  • No heat & humidity in September in Cardiff0
    No heat & humidity
  • 3.6 inches monthly rainfall in September in Cardiff3.6
    3.6 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Cardiff4
    4 (Moderate) UV index
  • 63°F sea temperature in September in Cardiff63
    63°F sea temperature

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The September weather guide for Wales (Cardiff) 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)

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More about Wales

How hot is it in Cardiff in September?

Daytime temperatures usually reach 64°F in Cardiff in September, falling to 50°F at night.

How sunny is it in Cardiff in September?

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

How warm is the sea around Cardiff in September?

The average sea temperature around Cardiff in September is 63°F.

Does it rain in Cardiff in September?

There are usually 15 days with some rain in Cardiff in September and the average monthly rainfall is 3.6 inches.

Cardiff September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 18:59
Monday, 15th September 2025 05:48 18:27
Tuesday, 30th September 2025 06:12 17:52

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