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Wales weather in August 2025
Expect daytime maximum temperatures of 20°C in Wales, UK in August based on long-term weather averages. There are 6 hours of sunshine per day on average with 15 days with some rainfall and typically 81 mm of rainfall in the month.
- 20°C max day temperature
20 - 6 hours of sunshine per day
- 15 days with some rainfall
15 - 12°C min night temperature
12 - 15 hours of daylight per day
15 - No heat & humidity
0 - 81 mm of monthly rainfall
81 - 6 (High) UV index
6 - 18°C sea temperature
18
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Recommended for Wales
The August 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 August. 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 / mm) | Imperial (°F / inches)
More about Wales
How hot is it in Wales in August?
Daytime temperatures usually reach 20°C in Cardiff, Wales in August, falling to 12°C at night.
How sunny is it in Wales in August?
There are normally 6 hours of bright sunshine each day in Cardiff, Wales in August - that's 41% of daylight hours.
How warm is the sea around Wales in August?
The average sea temperature around Cardiff, Wales in August is 18°C.
Does it rain in Wales in August?
There are usually 15 days with some rain in Cardiff, Wales in August and the average monthly rainfall is 81mm.
Wales August sunrise & sunset times
Browse the sunrise and sunset times for Wales in August 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 |
|---|---|---|
| Friday, 1st August 2025 | 04:37 | 20:00 |
| Saturday, 16th August 2025 | 05:00 | 19:33 |
| Sunday, 31st August 2025 | 05:24 | 19:01 |
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