Cardiff weather in September 2020

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  • 18°C maximum daytime temperature in September in Cardiff18
    18°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Cardiff15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Cardiff10
    10°C 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
  • 91 mm monthly rainfall in September in Cardiff91
    91 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Cardiff4
    4 (Moderate) UV index
  • 17°C sea temperature in September in Cardiff17
    17°C sea temperature
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The September weather guide for Cardiff, Wales 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.

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Cardiff holiday rentals

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Cardiff hotels

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Cardiff camping & hostels

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How hot is it in Cardiff in September?

Daytime temperatures usually reach 18°C in Cardiff in September, falling to 10°C 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 17°C.

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 91mm.

Cardiff sunrise & sunset times for September 2020

Browse the sunrise & sunset times for Cardiff in September 2020. Select a month to view Cardiff sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Tuesday, 1st September 2020 06:26 19:58
Tuesday, 15th September 2020 06:48 19:26
Wednesday, 30th September 2020 07:12 18:52
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Metric (°C / mm)  |  Imperial (°F / inches)

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Where's hot in Wales in September?

Below are average maximum temperatures at popular destinations in Wales in September. Select a destination to see more weather parameters.

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