Cwm Weather Forecast, Blaenau Gwent NP23 7

Today 26 Dec Wales

Boxing Day brings another widely sunny day, but cloud lingers in the south. Remaining breezy at times, with strong gusty winds over hills. Another cold day, with frost reforming overnight. Maximum Temperature 5C.

Tonight 26 Dec Wales

A mix of cloud and some clear spells tonight. Low cloud may filter into the east at times leading to some fog over the Welsh hills. Temperatures dipping below freezing under starry skies leading to some frosty conditions. Feeling cold. Minimum Temperature -3C.

Sat 27 Dec Wales

Sunny spells to start on Saturday but turning increasingly cloudy from the east later with some spots of drizzle. Brisk easterly winds continue to make it feel cold. Maximum Temperature 8C.

Sun 28 Dec Wales

Often cloudy with the odd spot of light rain and drizzle, though some brighter breaks remain possible to the west of hills. Often breezy, causing it to feel colder.

Mon 29 Dec Wales

Often cloudy with the odd spot of light rain and drizzle, though some brighter breaks remain possible to the west of hills. Often breezy, causing it to feel colder.

Tue 30 Dec Wales

Often cloudy with the odd spot of light rain and drizzle, though some brighter breaks remain possible to the west of hills. Often breezy, causing it to feel colder.

Wed 31 Dec Wales

High pressure is likely to be centred to the west or northwest over the North Atlantic through this period with low pressure to the east. Slowly evolving weather patterns are therefore most probable through this time. However, around the turn of the year, an area of low pressure may move through the North Sea bringing a period of wetter and windier weather, especially to the north. With cold air close to the UK, some wintry hazards are possible in places. Into January more settled conditions with colder and drier than average conditions are most probable. There will however be some periods of rain or showers and windier spells. Temperatures will probably be below average for this period overall and so wintry hazards remain a possibility in places.

Thu 1 Jan Wales

High pressure is likely to be centred to the west or northwest over the North Atlantic through this period with low pressure to the east. Slowly evolving weather patterns are therefore most probable through this time. However, around the turn of the year, an area of low pressure may move through the North Sea bringing a period of wetter and windier weather, especially to the north. With cold air close to the UK, some wintry hazards are possible in places. Into January more settled conditions with colder and drier than average conditions are most probable. There will however be some periods of rain or showers and windier spells. Temperatures will probably be below average for this period overall and so wintry hazards remain a possibility in places.

Cwm Weather Forecast

Today 26 Dec Wales

Tonight 26 Dec Wales

Sat 27 Dec Wales

Sun 28 Dec Wales

Mon 29 Dec Wales

Tue 30 Dec Wales

Wed 31 Dec Wales

Thu 1 Jan Wales

Temperature Forecast Met Office

Temperature Real-Time

Clee Hill (Shropshire) Radar

National Satellite

National Synoptic

Cwm Temperature Statistics

December Temperature

St-athan (41km)

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 (41km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025