St Mellons Weather Forecast, Cardiff CF3 0

Today 24 Dec Wales

Christmas Eve will be dry and settled. The morning will get off to a cloudy start, but some sunny spells will develop during the day. Feeling colder than of late, with a brisk easterly breeze blowing, adding to the chill. Maximum Temperature 5C.

Tonight 24 Dec Wales

Remaining dry this evening and overnight, with variable, often large amounts of cloud. A colder night than recent, with frost patches possible in some rural areas. Still rather windy, particularly in the west. Minimum Temperature 0C.

Thu 25 Dec Wales

Christmas Day will start quite cloudy again, but plenty of sunshine will develop during the day. It will remain blustery, with gales possible over hills. Feeling rather chilly. Maximum Temperature 5C.

Fri 26 Dec Wales

Staying largely dry on Boxing Day and through the weekend with variable cloud cover. Some clear or sunny spells. Cold throughout with some night frost, and breezy for a while.

Sat 27 Dec Wales

Staying largely dry on Boxing Day and through the weekend with variable cloud cover. Some clear or sunny spells. Cold throughout with some night frost, and breezy for a while.

Sun 28 Dec Wales

Staying largely dry on Boxing Day and through the weekend with variable cloud cover. Some clear or sunny spells. Cold throughout with some night frost, and breezy for a while.

Mon 29 Dec Wales

High pressure is likely to dominate across the UK through to the end of the year, centred to the west over the North Atlantic. This will likely maintain relatively settled conditions at first, but with a few showers possible along some coasts exposed to the northerly wind. Towards the first weekend of January, high pressure is likely to shift a little farther away from the UK, allowing a greater chance of more changeable conditions to develop. This will bring an increased risk of some rain or showers at times which, with cold air close to the UK, may bring some wintry hazards to some places. Temperatures will probably be near or slightly below average for this period overall.

Tue 30 Dec Wales

High pressure is likely to dominate across the UK through to the end of the year, centred to the west over the North Atlantic. This will likely maintain relatively settled conditions at first, but with a few showers possible along some coasts exposed to the northerly wind. Towards the first weekend of January, high pressure is likely to shift a little farther away from the UK, allowing a greater chance of more changeable conditions to develop. This will bring an increased risk of some rain or showers at times which, with cold air close to the UK, may bring some wintry hazards to some places. Temperatures will probably be near or slightly below average for this period overall.

St Mellons Weather Forecast

Today 24 Dec Wales

Tonight 24 Dec Wales

Thu 25 Dec Wales

Fri 26 Dec Wales

Sat 27 Dec Wales

Sun 28 Dec Wales

Mon 29 Dec Wales

Tue 30 Dec Wales

Temperature Forecast Met Office

Temperature Real-Time

Cobbacombe Cross (Devon) Radar

National Satellite

National Synoptic

St Mellons Temperature Statistics

December Temperature

St-athan (27km)

Lowest 9 January, 2025

Average 2025

Highest 12 August, 2025

Lowest 21 November, 2025

Average November

Highest 5 November, 2025

Lowest 17 December, 2025

Average December

Highest 9 December, 2025

Climate (2020–Present)

St-athan (27km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025