Wales climate

World Climates covers 4 places in Wales. By annual mean temperature, the warmest is Swansea (11 °C52 °F) and the coolest is Valley (11 °C52 °F). The wettest is Valley with 1,123 mm44 in of precipitation per year, the driest Cardiff with 967 mm38 in.

The most common climate types (Köppen classification computed from these averages) are temperate oceanic (Cfb, 4 places).

The highest monthly average high is in Newport (21 °C69 °F in July); the lowest monthly average low is in Cardiff (3 °C38 °F in February).

Across the places in Wales, the months that most often rank as the most comfortable are June, July and August (4, 4 and 4 of 4 places respectively).

Temperature and rainfall across Wales

Annual mean temperatures in Wales range from 11 °C52 °F to 11 °C52 °F. The typical place (the median of all 4) has a year average of 11 °C52 °F. Annual precipitation ranges from 967 mm38 in to 1,123 mm44 in. The median place receives about 1,036 mm41 in in an average year.

In 0 places of 4, the coldest month has an average low below 0 °C (32 °F). In 0 places, the warmest month has an average high above 30 °C (86 °F). No place here gets less than 250 mm (10 in) of precipitation a year. None gets more than 2,000 mm (79 in) a year.

Averaged over all 4 places, August is the warmest month, with a mean of 16 °C62 °F. February is the coldest, with 6 °C43 °F. The wettest month on average is December (116 mm4.6 in). The driest is April (59 mm2.3 in). Single places can differ a lot from this average, so check the page of each city.

The table below lists the places sorted by population. The largest ones covered here are Cardiff, Swansea and Newport. Each city page has a chart and a table for every month. It also shows the best time to visit and what to pack. The figures are 25-year averages for 2001–2025 from NASA POWER. They describe grid cells of roughly 50–70 km, not single weather stations.

Climate of each place in Wales

Cardiff has a temperate oceanic climate (Köppen Cfb). Its year average is 11 °C52 °F. The warmest month is July, with an average high of 21 °C69 °F. The coldest is February, with an average low of 3 °C38 °F. About 967 mm38 in of precipitation falls in a year. December is the wettest month and April the driest. By our comfort score, the best months to visit are June–September.

Swansea has a temperate oceanic climate (Köppen Cfb). Its year average is 11 °C52 °F. The warmest month is August, with an average high of 19 °C66 °F. The coldest is February, with an average low of 4 °C40 °F. About 1,105 mm43 in of precipitation falls in a year. December is the wettest month and April the driest. By our comfort score, the best months to visit are June–September.

Newport has a temperate oceanic climate (Köppen Cfb). Its year average is 11 °C52 °F. The warmest month is July, with an average high of 21 °C69 °F. The coldest is February, with an average low of 3 °C38 °F. About 967 mm38 in of precipitation falls in a year. December is the wettest month and April the driest. By our comfort score, the best months to visit are June–September.

Valley has a temperate oceanic climate (Köppen Cfb). Its year average is 11 °C52 °F. The warmest month is August, with an average high of 17 °C62 °F. The coldest is February, with an average low of 5 °C42 °F. About 1,123 mm44 in of precipitation falls in a year. December is the wettest month and April the driest. By our comfort score, the best months to visit are June–September.

Frequently asked questions

Which is the warmest place in Wales?

By annual mean temperature, the warmest place in Wales is Swansea at 11 °C52 °F. The coolest is Valley at 11 °C52 °F.

Where does it rain the most in Wales?

Valley gets the most precipitation, 1,123 mm44 in in an average year. The driest place is Cardiff with 967 mm38 in.

How many places in Wales does this site cover?

World Climates has climate data for 4 places in Wales. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.

When is the best time to visit Wales?

It depends on the place. Across Wales, the months that most often rank as the most comfortable are June, July and August. Check the page of each city for its own best months.