Climate in Wales (United Kingdom)

Index

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• Introduction - Valley, Lake Vyrnwy, Cardiff
• Best Time
• What to pack

Introduction

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In Wales, a country belonging to the United Kingdom and overlooking the Irish Sea, the climate is oceanic, cool, humid and cloudy for most of the year.
The wind blows frequently too.
However, there are differences depending on the area. The coasts are milder, while the inland areas, where hills and low mountains are found, are colder, and can experience heavy snowfalls in winter.
Precipitation is abundant on the south-western coast and in inland hills, where it exceeds 1,500 millimeters (60 inches) per year, while it drops to 850-1,000 mm (33-40 in) on the remaining coasts.
Snow is rare on the coasts, while it becomes more frequent in the inland hills. It snows on average for about 10 days a year in Swansea, on the southern coast, for 25 days in the inland hills, and for more than 40 days in Snowdonia.
In winter, the temperature generally reaches -5/-6 °C (21/23 °F) on the coldest days along the coasts, and lower values in inland areas.
However, from time to time there may be more intense cold spells than usual. In December 2010, the temperature dropped to -17.5 °C (0.5 °F) in Llysdinam, Powys, to the east of the mountains, while in January 1940, it even dropped to -23.3 °C (-10 °F) in Rhayader, in the same area.
In summer, the temperature rarely reaches 30 °C (86 °F), and it does so only on the hottest days.
The record heat in Wales is 37.1 °C (98.8 °F), set in July 2022 in Hawarden Bridge, northeast of Snowdonia and a short distance from Liverpool. The previous record was 35 °C (95 °F), set in August 1990 in the same location.

Valley

The island of Anglesey is located in the northwest. In the RAF (Royal Air Force) station of Valley, the average temperature goes from 6 °C (43 °F) in February to 16 °C (61 °F) in August. Here are the average temperatures.

Rainfall amounts to 855 mm (33.5 in) per year. The wettest season is autumn. Here is the average rainfall.

In the interior of Wales, there are hills and low mountains, where the climate becomes colder and wetter as the altitude increases.
In the national park of Snowdonia, we find Mount Snowdon, which reach 1,085 meters (3,560 feet) and is the highest in Wales. It is believed that one of the peaks of the area (Crib Goch) is the rainiest point in the whole of Great Britain: 4,475 mm (176 in) of rain fall there per year. On these peaks, it can snow from October to May. Temperatures vary a lot, and can become mild under the influence of south-west air masses.

Lake Vyrnwy

Already on the banks of Lake Vyrnwy, at an altitude of 360 meters (1,180 ft), the temperature is lower than at sea level. Here are the average temperatures.

Precipitation is plentiful, given that it amounts to 1,680 mm (66 in) per year. Here is the average rainfall.

In the south-west of Wales, we find then the Brecon Beacons National Park, whose highest point is Pen y Fan, 886 meters high.

Cardiff

In Cardiff, the capital, located in the south, in the Bristol Channel, the average temperature ranges from around 5.5 °C (42 °F) in January to 16.5 °C (61.5 °F) in July.
Here, the temperature reached -10.2 °C (13.5 °F) in January 1987 and 33.5 °C (92.5 °F) in August 1990.
Here are the average temperatures.

In Cardiff, 1,150 mm (45 in) of rain fall per year, with a maximum between October and January and a relative minimum between April and June. Here is the average precipitation.

In Wales, the sky is often cloudy, however, the coasts, where there are 1,500/1,600 hours of sunshine per year, are the sunniest areas. In Cardiff, the sun shines for about 6 hours per day from May to August (which, considering the length of the days, are not many). Here are the average sunshine hours per day in Cardiff.

The temperature of the sea in Wales remains very cool, if not cold, even in summer: in August, the temperature of the Atlantic Ocean reaches 16 °C (61 °F). Here are the average water temperatures at Swansea (located on the coast, west of Cardiff).

Best Time

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The best time to visit Wales is summer, from June to August, since it is the mildest period of the year.

What to pack

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In winter: pack warm clothes, such as a sweater, a coat, a wind jacket, and a raincoat. For colder periods: pack gloves, a hat, and a scarf.
In summer: pack clothes for spring and autumn, a jacket and a sweater, and a raincoat or umbrella.

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