Saturday
A dry day overall, with high pressure centred to the south-west. Early low cloud and murk, partcularly in the north & west, but breaking up in most places to give good spells of sunshine. Sunniest around southern coasts. Patchy drizzle around low cloud, focused on western Scotland. Small risk of an isolated shower. Light winds from the west or north-west. Coastal sea breezes. Highs 28 to 31C southern England; 23 to 26C Midlands; 18 to 22C north & west Britain & Ireland.

Saturday night
Most places will be dry overnight, with lengthy clear spells. Thicker cloud toward the north-west, with patchy rain or drizzle for western Scotland. Very little wind inland. A breeze from the east/north-east on southern coasts, whilst Scotland sees a southwesterly breeze. Staying warm and humid in the south-east 14 to 18C, but lowest temperatures nearer 10 to 13C elsewhere, locally cooler in rural northern Britain.

Sunday
High pressure resides across central and southern Britain, resulting in a fair and warm day for most places. Lots of sunshine. Fronts over the Atlantic encroach toward the north-west, with skies clouding over, and patchy rain developing later for western Scotland and the north-west of Ireland. Southwesterly winds will freshen here too, otherwise light winds and coastal sea breezes. Highs 17 to 21C north & west; 24 to 27C Midlands, 28 to 30C south-east.

Monday
High pressure weakens across southern areas, but should maintain a dry and very warm day for central-southern England and Wales with light winds. Sunshine becoming hazy. Fronts slipping southwards across Scotland and Ireland bring cloudy skies and patchy rain, most persistent toward the west, accompanied by a fresh southwesterly breeze. Feeling humid, 17 to 22C north, 25 to 30C Midlands and south, locally 32C in the south-east.