Treharris Weather Forecast, Merthyr Tydfil CF46 5

Today 18 Jul Wales

Widely cloudy to start with heavy showers initially in the northwest gradually easing and fading away as they spread inland. Brighter skies to follow, with sunny spells more prolonged through the afternoon. Light winds but feeling increasingly muggy. Maximum Temperature 23C.

Tonight 18 Jul Wales

Some late spells of sunshine with clear skies for many overnight. Turning cloudier by dawn with a few showers arriving in the east. Warm, muggy, and rather uncomfortable for sleeping. Minimum Temperature 14C.

Sat 19 Jul Wales

A mixture of sunshine and showers, these heaviest and carrying the risk of thunderstorms and hail in the north and east. Some sunshine in the southwest before rain arrives later. Maximum Temperature 23C.

Sun 20 Jul Wales

Further showers are expected on Sunday with heavy, thundery downpours. Drier and brighter from Monday although a few heavy showers are still possible. Feeling warm in sunny spells.

Mon 21 Jul Wales

Further showers are expected on Sunday with heavy, thundery downpours. Drier and brighter from Monday although a few heavy showers are still possible. Feeling warm in sunny spells.

Tue 22 Jul Wales

Further showers are expected on Sunday with heavy, thundery downpours. Drier and brighter from Monday although a few heavy showers are still possible. Feeling warm in sunny spells.

Wed 23 Jul Wales

Overall a rather more changeable pattern of weather through this period, compared to much of the summer thus far. Wednesday will likely see a continuation of heavy, perhaps thundery showers, although the focus may be more across the north and east by this stage. Thereafter, a general westerly or north-westerly regime looks to become established, with occasional weather systems moving in from the Atlantic. This means further rain or showers and breezy conditions at times, especially in the northwest. This will be interspersed with some drier, sunnier periods. Temperatures are expected to be close to or a little above average for most of the period. This broad pattern is likely to continue through to the end of July.

Thu 24 Jul Wales

Overall a rather more changeable pattern of weather through this period, compared to much of the summer thus far. Wednesday will likely see a continuation of heavy, perhaps thundery showers, although the focus may be more across the north and east by this stage. Thereafter, a general westerly or north-westerly regime looks to become established, with occasional weather systems moving in from the Atlantic. This means further rain or showers and breezy conditions at times, especially in the northwest. This will be interspersed with some drier, sunnier periods. Temperatures are expected to be close to or a little above average for most of the period. This broad pattern is likely to continue through to the end of July.

Treharris Weather Forecast

Today 18 Jul Wales

Tonight 18 Jul Wales

Sat 19 Jul Wales

Sun 20 Jul Wales

Mon 21 Jul Wales

Tue 22 Jul Wales

Wed 23 Jul Wales

Thu 24 Jul Wales

Temperature Forecast Met Office

Temperature Real-Time

Cobbacombe Cross (Devon) Radar

National Satellite

National Synoptic

Treharris Temperature Statistics

July Temperature

St-athan (30km)

Lowest 9 January, 2025

Average 2025

Highest 11 July, 2025

Lowest 8 June, 2025

Average June

Highest 20 June, 2025

Lowest 3 July, 2025

Average July

Highest 11 July, 2025

Climate (2020–Present)

St-athan (30km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025