Friday
A mostly dry and sunny start for central and southern Ireland, Wales, England, as well as southern and eastern Scotland. Western Scotland and Northern Ireland will begin the day cloudy and wet. Through the afternoon, drier and brighter conditions will gradually spread eastwards, with any rain soon clearing. Highs reaching 28 to 29C across much of England, locally 31C in the southeast, around 25C across parts of Scotland, and nearer 20C over Ireland.

Friday Night
A dry evening with some late sunshine, especially across southern and eastern areas. Ireland will turn cloudier overnight into Saturday, with some rain reaching far western parts by dawn. Minimum temperatures widely around 12 to 14C in the north and west, but staying much warmer at 20 to 22C in the southeast.
 

Saturday
Cloudier conditions for Ireland and Scotland with scattered showers, a few of them heavy across parts of Ireland. England and Wales will enjoy a largely dry and sunny day, although a few isolated showers may develop across northern England. Temperatures reaching 18 to 20C for many areas, but locally up to 28C in the far southeast.
 

Sunday
A rather cloudy day with outbreaks of rain affecting western and northern Ireland, western Scotland and northwest England. Elsewhere, only a few scattered showers are expected. Highs around 18C in the north and west, but nearer 22C in the south and east.