Summary for all mountain areas

A warm and humid day with extensive low cloud affecting many hills and pulses of thundery rain moving north through the morning followed by further clusters of showers or thunderstorms. Becoming largely dry through the afternoon across Wales as winds veer southwesterly. Best of the cloud breaks will be towards the west coast.

Headline for Brecon Beacons

Very humid. Risk isolated thunderstorms. Hill fog lifting PM.

How windy? (On the summits)

Southerly later southwesterly 10-20mph.

Effect of wind on you?

Small.

How Wet? (Precipitation and its impact)

Risk isolated thunderstorms.

Dry much of the day, but risk of isolated heavy showers/thunderstorms developing during the day.

Cloud on the hills?

Lifting to higher tops PM.

Fog fairly extensive across the hills from dawn, in places to lower slopes. Bases will lift and break into the afternoon with cloud mostly becoming confined to higher tops. However, patches may persist at times to lower slopes western Beacons and toward Preseli hills.

Chance of cloud free summits?

20% morning, 70% afternoon.

Sunshine?
Air clarity (below cloud)

Patches of sunshine developing. Murky, visibility reduced considerably by rain, and a general haze at best.

How Cold? (at 750m)

14C, very humid.

Freezing Level

Above the summits.