Swimming in Wales in may 2025 Sea temperature by city in may
Do you want to go to the beach in Wales in may 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in may in Wales by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Wales in may 2025
Here, find the average sea temperature in Wales in may in several coastal cities.
53°F
min: 51°F / max: 55°F
Conwy
52°F
min: 50°F / max: 54°F
Holyhead
51°F
min: 49°F / max: 53°F
52°F
min: 51°F / max: 55°F
Snowdonia National Park
52°F
min: 49°F / max: 54°F
53°F
min: 51°F / max: 55°F
Aberystwyth
52°F
min: 50°F / max: 54°F
Amlwch
51°F
min: 49°F / max: 54°F
52°F
min: 50°F / max: 54°F
Barry
53°F
min: 51°F / max: 55°F
Buckley
52°F
min: 50°F / max: 55°F
Fishguard
53°F
min: 51°F / max: 55°F
52°F
min: 50°F / max: 54°F
Llanelli
53°F
min: 51°F / max: 55°F
Porthcawl
53°F
min: 51°F / max: 56°F
Where should you go swimming in Wales in the month of may?
Swimming in Wales in may is freezing
In may in Wales swimming conditions are generally the same everywhere.
Forget about swimming in Cardiff, Conwy, Holyhead, Pembrokeshire, Snowdonia National Park, Swansea, Aberystwyth, Amlwch, Barmouth, Barry, Buckley, Fishguard, Llandudno, Llanelli and Porthcawl in may! The water temperature is freezing, reaching as low as 51°F (and only 55°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!
Where to go swimming in Wales in may: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in may
Cardiff
| May | |||
| Average sea temperature | 53°F | ||
| Minimum sea temperature | 51°F | ||
| Maximum sea temperature | 55°F | ||
| Average outside temperature | 56°F | ||
| Maximum outside temperature | 59°F | ||
| Minimum outside temperature | 50°F | ||
| Precipitation | 2.3in | ||
| Number of days of precipitation | 4 jour(s) (11%) | ||
| Cloud cover | 47% | ||
| Our opinion | freezing swimming |
More information on swimming in Cardiff in may
Conwy
| May | |||
| Average sea temperature | 52°F | ||
| Minimum sea temperature | 50°F | ||
| Maximum sea temperature | 54°F | ||
| Average outside temperature | 54°F | ||
| Maximum outside temperature | 58°F | ||
| Minimum outside temperature | 50°F | ||
| Precipitation | 3.6in | ||
| Number of days of precipitation | 7 jour(s) (22%) | ||
| Cloud cover | 50% | ||
| Our opinion | freezing swimming |
Holyhead
| May | |||
| Average sea temperature | 51°F | ||
| Minimum sea temperature | 49°F | ||
| Maximum sea temperature | 53°F | ||
| Average outside temperature | 54°F | ||
| Maximum outside temperature | 56°F | ||
| Minimum outside temperature | 50°F | ||
| Precipitation | 3.8in | ||
| Number of days of precipitation | 7 jour(s) (21%) | ||
| Cloud cover | 47% | ||
| Our opinion | freezing swimming |
Pembrokeshire
| May | |||
| Average sea temperature | 52°F | ||
| Minimum sea temperature | 51°F | ||
| Maximum sea temperature | 55°F | ||
| Average outside temperature | 54°F | ||
| Maximum outside temperature | 58°F | ||
| Minimum outside temperature | 52°F | ||
| Precipitation | 3.5in | ||
| Number of days of precipitation | 6 jour(s) (19%) | ||
| Cloud cover | 45% | ||
| Our opinion | freezing swimming |
More information on swimming in Pembrokeshire in may
Snowdonia National Park
| May | |||
| Average sea temperature | 52°F | ||
| Minimum sea temperature | 49°F | ||
| Maximum sea temperature | 54°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 54°F | ||
| Minimum outside temperature | 45°F | ||
| Precipitation | 5in | ||
| Number of days of precipitation | 8 jour(s) (26%) | ||
| Cloud cover | 56% | ||
| Our opinion | freezing swimming |
List of coastal cities in Wales
| Cardiff in may | freezing swimming |
| Conwy in may | freezing swimming |
| Holyhead in may | freezing swimming |
| Pembrokeshire in may | freezing swimming |
| Snowdonia National Park in may | freezing swimming |
| Swansea in may | freezing swimming |
| Aberystwyth in may | freezing swimming |
| Amlwch in may | freezing swimming |
| Barmouth in may | freezing swimming |
| Barry in may | freezing swimming |
| Buckley in may | freezing swimming |
| Fishguard in may | freezing swimming |
| Llandudno in may | freezing swimming |
| Llanelli in may | freezing swimming |
| Porthcawl in may | freezing swimming |