Friday
Any early showers will quickly clear, leaving a largely dry and increasingly hot day across England and Wales with prolonged spells of sunshine. Temperatures will rise sharply, becoming locally very hot in the south and east. Ireland will remain very warm but generally cloudier, with scattered showers developing, particularly across northern and western areas. Scotland will also see a mix of sunshine and showers, although southern districts will remain very warm while fresher conditions persist further north. Highs reaching 32 to 34C across parts of England, 28C in Wales, and 25 to 26C across Ireland and southern Scotland.

Friday Night
A warm and humid night is expected across southern and eastern England, where temperatures will remain unusually high. Elsewhere, fresher air will gradually spread eastwards. Cloud will increase across Ireland and Scotland, with outbreaks of rain arriving later in the night. Minimum temperatures generally between 16 and 18C, but remaining as high as 24 to 25C across parts of southern and eastern England.

Saturday
Cloudier conditions will develop across Ireland and Scotland, bringing outbreaks of rain at times. Western parts of England and Wales may also see some patchy rain later in the day. Further east, however, it will remain dry, sunny and very warm, with locally hot conditions continuing across central, southern and eastern England. Temperatures reaching 29 to 30C in eastern Wales and eastern England, while most other areas see highs between 18 and 20C.

Sunday
A marked change arrives as cooler Atlantic air spreads across the British Isles. Temperatures will return closer to seasonal values, accompanied by a brisk westerly breeze. Northern Ireland, western Scotland and northwestern England will experience extensive cloud and some outbreaks of rain, while brighter conditions develop further south and east. Highs of 16 to 18C across Ireland and Scotland, and 22 to 24C in southeast England.