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Wales weather in September 2025
Expect 64°F 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 2025/2026.
- 64°F max day temperature
64 - 5 hours of sunshine per day
- 15 days with some rainfall
15 - 50°F min night temperature
50 - 13 hours of daylight per day
13 - No heat & humidity
0 - 3.6 inches of monthly rainfall
3.6 - 4 (Moderate) UV index
4 - 63°F sea temperature
63
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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.
Top Wales destinations
Below are average maximum temperatures at popular countries, regions and places in Wales in September. Select a holiday destination to see more weather parameters.
All Wales regions
All Wales destinations
- Aberaeron
- Abergavenny
- Aberystwyth
- Bangor
- Barmouth
- Betws-y-Coed
- Brecon
- Builth Wells
- Caernarfon
- Camarthen
- Cardiff
- Chepstow
- Colwyn Bay
- Cowbridge
- Fishguard
- Gower Peninsula
- Haverfordwest
- Hay-on-Wye
- Holyhead
- Lake Vyrnwy
- Llangollen
- Machynlleth
- Monmouth
- Pembroke
- Porthcawl
- Porthmadog
- Pwllheli
- Rhayader
- Rhyl
- St Davids
- Swansea
- Tenby
- Welshpool
- Wrexham
Metric (°C) | Imperial (°F)
More about Wales
How hot is it in Wales in September?
Daytime temperatures usually reach 64°F in Cardiff, Wales in September, falling to 50°F 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 63°F.
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 3.6 inches.
Wales September sunrise & sunset times
Browse the sunrise and sunset times for Wales in September 2025. 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.
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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