Friday
High pressure lies south-west of Britain, whilst weak fronts affect northern areas. Sunshine for the south & east, but largely cloudy west & north. Patchy rain for Northern Ireland, southern Scotland & north-west England, sinking south across Ireland and into north Wales later, but amounts generally small. A few showers possible in north-east England. A westerly breeze. A fresh 16 to 19C north-west, but quite humid at 22 to 26C south & east.

Friday night
Pressure builds slowly across the country, and fronts slipping southwards will weaken overnight. Fairly cloudy, particularly in the west, whilst some clear breaks will develop for the east and north. A little rain or drizzly for west Wales & south-west England, also southern Ireland, but should mostly fade. Light winds overall. Lows around 13 to 15C south, 8 to 12C north, locally cooler in Scotland.

Saturday
High pressure influences the country, bringing a fair day to most places. Variable cloud, but there should be a good deal of sunshine, generally best in the east & north-east. The south-west could stay dull with murk around the coasts. Chance of an afternoon shower for central England & Wales. Winds generally light. Fronts bring a risk of patchy rain to north-west Scotland, and a fresh south-westerly breeze. Highs 17 to 25C, warmest far south.

Sunday
Slack pressure across Britain and Ireland. Expect some warm sunshine, and many places will stay dry all day. A risk of thundery showers breaking out, mainly in the south, which may merge into an organised cluster of thunderstorms for southern England later. Fronts bring outbreaks of rain to western parts of Scotland & Ireland. Winds mostly very light, breezy in the far north. Highs 17 to 21C north & west, 22 to 25C south & east.