Treharris Weather Forecast, Merthyr Tydfil CF46 5

Today 26 Nov Wales

A dry and cold start but any brightness in the east short-lived. Some rain arriving in the west this morning and turning increasingly wet and breezy more widely this afternoon. Chilly, but turning milder in the south and west later. Maximum Temperature 8C.

Tonight 26 Nov Wales

Rain will continue to clear east this evening, with many places turning drier overnight, albeit with patchy drizzle in places. Widely murky with hill fog developing readily across higher ground. Breezy, especially along the coast, and very mild by morning Minimum Temperature 7C.

Thu 27 Nov Wales

A damp, grey, rather windy day with outbreaks of rain moving in from the west at times. Becoming drier overnight. Milder than recent days but much breezier too. Maximum Temperature 13C.

Fri 28 Nov Wales

Staying changeable with showers or longer spells of rain. Drier and brighter periods are also likely, more especially over the weekend. Turning colder once again and rather windy at times.

Sat 29 Nov Wales

Staying changeable with showers or longer spells of rain. Drier and brighter periods are also likely, more especially over the weekend. Turning colder once again and rather windy at times.

Sun 30 Nov Wales

Staying changeable with showers or longer spells of rain. Drier and brighter periods are also likely, more especially over the weekend. Turning colder once again and rather windy at times.

Mon 1 Dec Wales

Changeable and often unsettled conditions are expected across the UK during this period. Low pressure systems will tend to dominate meaning showers or longer spells of rain for much of the UK, though some brief drier, more settled interludes are also possible. The wettest weather is perhaps more likely in parts of the west, but heavy rain is possible almost anywhere at times through this period. The greatest chance of snow will probably be over northern high ground. Given the dominance of low pressure, strong winds are also likely at times. Overall, temperatures are predicted to be close to average, though colder conditions may occasionally encroach into northern areas. Some frost is to be expected where drier, clearer conditions develop overnight.

Tue 2 Dec Wales

Changeable and often unsettled conditions are expected across the UK during this period. Low pressure systems will tend to dominate meaning showers or longer spells of rain for much of the UK, though some brief drier, more settled interludes are also possible. The wettest weather is perhaps more likely in parts of the west, but heavy rain is possible almost anywhere at times through this period. The greatest chance of snow will probably be over northern high ground. Given the dominance of low pressure, strong winds are also likely at times. Overall, temperatures are predicted to be close to average, though colder conditions may occasionally encroach into northern areas. Some frost is to be expected where drier, clearer conditions develop overnight.

Treharris Weather Forecast

Today 26 Nov Wales

Tonight 26 Nov Wales

Thu 27 Nov Wales

Fri 28 Nov Wales

Sat 29 Nov Wales

Sun 30 Nov Wales

Mon 1 Dec Wales

Tue 2 Dec Wales

Temperature Forecast Met Office

Temperature Real-Time

Cobbacombe Cross (Devon) Radar

National Satellite

National Synoptic

Treharris Temperature Statistics

November Temperature

St-athan (30km)

Lowest 9 January, 2025

Average 2025

Highest 12 August, 2025

Lowest 26 October, 2025

Average October

Highest 3 October, 2025

Lowest 21 November, 2025

Average November

Highest 5 November, 2025

Climate (2020–Present)

St-athan (30km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025