Monday
A very warm day, hot in the south, also very humid. Sunshine and high-level cloud, which may cover the sky more widely over north and western areas, obscuring the sun for periods. A risk of isolated thundery bursts of rain forming in west and southwest areas, then mainly later in the day across Wales and northern England, but many places miss these. Some patchy rain or drizzle near west coasts of Scotland and Ireland. Light southeasterly breezes, locally gustier along southern coasts. Temperatures rising to 32C in southern England, 26 to 29C for the Midlands and Wales. 21 to 24C for northern England, Scotland and Northern Ireland.

Monday night
Potential for local thundery bursts of rain for northern England and southern Scotland, drifting eastwards. Some places just seeing odd spots, but risk of localised heavier showers or thunderstorms. Smaller risk of an isolated thundery shower for southeastern England. Variable amounts of high cloud. Light winds overall, more breeze near the east coast. A very humid night, lowest temperatures 15 to 18C for many, towns and cities in the south staying around 20C. Nearer 12C for Scotland and coastal eastern England.

Tuesday
A scorching hot day for central and southern areas, also extremely humid. Strong sun and thin high cloud. Dry overall. Some misty low cloud around coasts in the west of Ireland, also possibly western Scotland. Light southerly winds, variable and little wind for central and western England, also Wales and southern Ireland. Southwesterly breezes for Scotland and far north of Ireland. Temperatures soaring into the 30s across the Midlands, south and east of England, also east and south Wales, highs toward 36C in the Home Counties and London area. Nearer 24C in Cumbria, Scotland and northern Ireland, local 26C east Scotland.

Wednesday
Exceptionally hot and humid across central and southern England and Wales. Widespread strong sunshine, some thin high cloud toward the southwest. Low cloud and fog around the northwest of Ireland and western Scotland where it will be much cooler, some drizzle locally. Easterly breezes for the south of England, strongest along Channel coasts. Light winds further north. Top temperatures reaching 29 to 33C widely for much of England and Wales, up to 35 or 36C in southern counties. 24 to 28C for Ireland and the far north of England. 22 to 25C Scotland and Northern Ireland, but only 16C if foggy in the northwest.