Wales weather in September 2023

Expect 18°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Wales in September. Check more long-term weather averages for Wales in September before you book your next holiday to Wales in 2023/2024.

18
18°C max day temperature
5
5 hours of sunshine per day
15
15 days with some rainfall
10
10°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
91
91 mm of monthly rainfall
4
4 (Moderate) UV index
17
17°C sea temperature

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.

Top Wales destinations

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

Wales regions

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Metric (°C / mm) | Imperial (°F / inches)

More about Wales

How hot is it in Wales in September?

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

How sunny is it in Wales in September?

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

How warm is the sea around Wales in September?

The average sea temperature around Cardiff, Wales in September is 17°C.

Does it rain in Wales in September?

There are usually 15 days with some rain in Cardiff, Wales in September and the average monthly rainfall is 91mm.

Wales September sunrise & sunset times

Browse the sunrise and sunset times for Wales in September 2023. Select a month to view Wales sunrise and sunset times for the next 12 months. The Wales sunrise and sunset times shown below are for Cardiff.