Friday
High pressure will dominate across much of the British Isles, bringing a dry day with plenty of sunshine. The best of the sunshine will be across central and southern England, where it will feel very warm. Northern and western Scotland will be breezier and cloudier, with outbreaks of rain. Thicker cloud may also bring the odd spot of drizzle to the far north of Ireland. Highs of 22 to 24C in the southeast, but nearer 16C in the northwest.

Friday Night
Rain will continue across northwestern Scotland through the evening and overnight. Thicker cloud, along with a few showers, will spread into western Ireland and perhaps towards the Irish Sea. Farther east, conditions will remain dry with clear spells. Minimum temperatures of 16C in the southeast and 14C in the northwest.
 

Saturday
England, Wales, and southern and eastern Scotland will have a largely dry day, with the best of the sunshine in the south. Ireland and the remainder of Scotland will be mostly cloudy, with outbreaks of rain focused mainly across western and northwestern areas. Maximum temperatures of 26 to 27C in the southeast, but only around 15C in the northwest.
 

Sunday
A couple of weather fronts will bring outbreaks of rain to Scotland, Ireland, and northern England during Sunday. Wales, central England, and southern England will remain dry with plenty of sunny spells. Later in the day, the rain will become increasingly confined to Scotland, while Ireland turns predominantly dry. Highs of 30C in the far southeast, but a much cooler 16C in the northwest.