Swimming in Wales in august 2025 Sea temperature by city in august
Do you want to go to the beach in Wales in august 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 august in Wales by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Wales in august 2025
Here, find the average sea temperature in Wales in august in several coastal cities.
63°F
min: 61°F / max: 64°F
Conwy
62°F
min: 61°F / max: 63°F
Holyhead
60°F
min: 58°F / max: 61°F
62°F
min: 60°F / max: 64°F
Snowdonia National Park
60°F
min: 59°F / max: 62°F
63°F
min: 61°F / max: 64°F
Aberystwyth
61°F
min: 60°F / max: 62°F
Amlwch
60°F
min: 59°F / max: 62°F
60°F
min: 59°F / max: 62°F
Barry
63°F
min: 61°F / max: 63°F
Buckley
63°F
min: 61°F / max: 64°F
Fishguard
62°F
min: 61°F / max: 64°F
62°F
min: 61°F / max: 63°F
Llanelli
63°F
min: 61°F / max: 65°F
Porthcawl
63°F
min: 62°F / max: 65°F
Where should you go swimming in Wales in the month of august?
Swimming in Wales in august is cool (in the best case scenario)
In august in Wales swimming conditions vary by city. Details below:
Swimming in august in Porthcawl is possible but the sea is generally cool. So though the sea temperature may sometimes reach 65°F, it can also go as low as 62°F. Note that the average is 63°F.
Swimming in august in Cardiff, Conwy, Holyhead, Pembrokeshire, Snowdonia National Park, Swansea, Aberystwyth, Amlwch, Barmouth, Barry, Buckley, Fishguard, Llandudno and Llanelli is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 63°F (min: 61°F/max: 64°F).
Where to go swimming in Wales in august: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in august
Cardiff
| August | |||
| Average sea temperature | 63°F | ||
| Minimum sea temperature | 61°F | ||
| Maximum sea temperature | 64°F | ||
| Average outside temperature | 63°F | ||
| Maximum outside temperature | 67°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 2.8in | ||
| Number of days of precipitation | 4 jour(s) (13%) | ||
| Cloud cover | 50% | ||
| Our opinion | cold swimming |
More information on swimming in Cardiff in august
Conwy
| August | |||
| Average sea temperature | 62°F | ||
| Minimum sea temperature | 61°F | ||
| Maximum sea temperature | 63°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 65°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 4.8in | ||
| Number of days of precipitation | 7 jour(s) (24%) | ||
| Cloud cover | 54% | ||
| Our opinion | cold swimming |
Holyhead
| August | |||
| Average sea temperature | 60°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 61°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 63°F | ||
| Minimum outside temperature | 59°F | ||
| Precipitation | 6.2in | ||
| Number of days of precipitation | 10 jour(s) (33%) | ||
| Cloud cover | 52% | ||
| Our opinion | cold swimming |
Pembrokeshire
| August | |||
| Average sea temperature | 62°F | ||
| Minimum sea temperature | 60°F | ||
| Maximum sea temperature | 64°F | ||
| Average outside temperature | 63°F | ||
| Maximum outside temperature | 65°F | ||
| Minimum outside temperature | 61°F | ||
| Precipitation | 5.8in | ||
| Number of days of precipitation | 8 jour(s) (27%) | ||
| Cloud cover | 50% | ||
| Our opinion | cold swimming |
More information on swimming in Pembrokeshire in august
Snowdonia National Park
| August | |||
| Average sea temperature | 60°F | ||
| Minimum sea temperature | 59°F | ||
| Maximum sea temperature | 62°F | ||
| Average outside temperature | 56°F | ||
| Maximum outside temperature | 59°F | ||
| Minimum outside temperature | 52°F | ||
| Precipitation | 5.8in | ||
| Number of days of precipitation | 8 jour(s) (27%) | ||
| Cloud cover | 62% | ||
| Our opinion | cold swimming |
List of coastal cities in Wales
| Cardiff in august | cold swimming |
| Conwy in august | cold swimming |
| Holyhead in august | cold swimming |
| Pembrokeshire in august | cold swimming |
| Snowdonia National Park in august | cold swimming |
| Swansea in august | cold swimming |
| Aberystwyth in august | cold swimming |
| Amlwch in august | cold swimming |
| Barmouth in august | cold swimming |
| Barry in august | cold swimming |
| Buckley in august | cold swimming |
| Fishguard in august | cold swimming |
| Llandudno in august | cold swimming |
| Llanelli in august | cold swimming |
| Porthcawl in august | cool swimming |