Cefn Mawr Weather Forecast, Powys SY16 3

Today 20 Aug Wales

A little damp in places first thing with some light drizzle possible. Most places staying dry though with increasing amounts of warm sunshine developing by this afternoon. Slightly breezier than yesterday. Maximum Temperature 23C.

Tonight 20 Aug Wales

A mainly sunny evening followed by a dry night with largely clear skies. Turning rather chilly, especially in the countryside, where a few localised fog patches may form later. Minimum Temperature 6C.

Thu 21 Aug Wales

A cool start but quickly warming up in the strong August sunshine. Some cloud is likely at times but feeling warm in the sunshine with lighter winds than on Wednesday. Maximum Temperature 23C.

Fri 22 Aug Wales

High pressure will bring a settled picture through this period. Remaining dry with a mixture of cloud and sunny periods. Chilly nights at first but feeling warm in the sunshine.

Sat 23 Aug Wales

High pressure will bring a settled picture through this period. Remaining dry with a mixture of cloud and sunny periods. Chilly nights at first but feeling warm in the sunshine.

Sun 24 Aug Wales

High pressure will bring a settled picture through this period. Remaining dry with a mixture of cloud and sunny periods. Chilly nights at first but feeling warm in the sunshine.

Mon 25 Aug Wales

High pressure is likely to be the dominant feature at first, which would bring widely fine and dry weather for the Sunday of the Bank Holiday weekend. Whilst this is happening, low pressure in the Atlantic is expected to bring a change in weather to the UK, though the timing of any specific features is currently uncertain. From early to mid-week, high pressure is likely to become increasingly eroded from the west as areas of low pressure and frontal systems start to move in from the Atlantic, leading to more changeable conditions with spells of rain through the remainder of the week and the following weekend. Temperatures likely warm or very warm to start before quickly trending towards average.

Tue 26 Aug Wales

High pressure is likely to be the dominant feature at first, which would bring widely fine and dry weather for the Sunday of the Bank Holiday weekend. Whilst this is happening, low pressure in the Atlantic is expected to bring a change in weather to the UK, though the timing of any specific features is currently uncertain. From early to mid-week, high pressure is likely to become increasingly eroded from the west as areas of low pressure and frontal systems start to move in from the Atlantic, leading to more changeable conditions with spells of rain through the remainder of the week and the following weekend. Temperatures likely warm or very warm to start before quickly trending towards average.

Cefn Mawr Weather Forecast

Today 20 Aug Wales

Tonight 20 Aug Wales

Thu 21 Aug Wales

Fri 22 Aug Wales

Sat 23 Aug Wales

Sun 24 Aug Wales

Mon 25 Aug Wales

Tue 26 Aug Wales

Temperature Forecast Met Office

Temperature Real-Time

Clee Hill (Shropshire) Radar

National Satellite

National Synoptic

Cefn Mawr Temperature Statistics

August Temperature

Lake Vyrnwy Saws (27km)

Lowest 9 January, 2025

Average 2025

Highest 11 July, 2025

Lowest 2 July, 2025

Average July

Highest 11 July, 2025

Lowest 2 August, 2025

Average August

Highest 12 August, 2025

Climate (2020–Present)

Lake Vyrnwy Saws (27km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025