Average monthly water temperature in Cardiff, the United Kingdom
On this page you find the mean water temperature over the year in Cardiff (Wales), the United Kingdom. Discover when the water is at its warmest and coolest, perfect for planning your visit.
In Cardiff, cooler water temperatures are a year-round feature. The warmest month is August, averaging 16°C (61°F).
The coldest month, February, sees averages of 7°C (45°F). This does not make it a great month for visitors who enjoy swimming.
Cardiff Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cardiff - and find the best time to visit.
Cardiff 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Cardiff climate overview or explore weather in the United Kingdom.
Popular this month
Where to go in August - average daytime high across popular destinations.
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