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Wales weather in May 2025
Expect 16°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Wales in May. Check more long-term weather averages for Wales in May before you book your next holiday to Wales in 2025/2026.
- 16°C max day temperature
16 - 6 hours of sunshine per day
- 15 days with some rainfall
15 - 7°C min night temperature
7 - 16 hours of daylight per day
16 - No heat & humidity
0 - 65 mm of monthly rainfall
65 - 5 (Moderate) UV index
5 - 12°C sea temperature
12
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The May 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 May. 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 warm is it in Wales in May?
Daytime temperatures usually reach 16°C in Cardiff, Wales in May, falling to 7°C at night.
How sunny is it in Wales in May?
There are normally 6 hours of bright sunshine each day in Cardiff, Wales in May - that's 41% of daylight hours.
How warm is the sea around Wales in May?
The average sea temperature around Cardiff, Wales in May is 12°C.
Does it rain in Wales in May?
There are usually 15 days with some rain in Cardiff, Wales in May and the average monthly rainfall is 65mm.
Wales May sunrise & sunset times
Browse the sunrise and sunset times for Wales in May 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 |
|---|---|---|
| Thursday, 1st May 2025 | 04:44 | 19:36 |
| Friday, 16th May 2025 | 04:19 | 20:00 |
| Saturday, 31st May 2025 | 04:02 | 20:19 |
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