Friday
A cold front forms a divide between cool conditions in northern Britain and Ireland, and warm conditions toward the south. The Midlands, south & east stay dry with sunny spells. Early murk or fog will break up. Wet for north/west Wales and northern England, with rain or drizzle on and off much of the day, heavy at times, especially over hills. A few showers for western Scotland, but dry with sunshine in eastern Scotland, also Northern Ireland. Highs 10 to 13C north, 18 to 22C south.

Friday night
A frontal system remains across Wales and northern England, with further pulses of rain, persistent over several hours. This zone gradually sinks south-eastwards, to affect the north/west Midlands by early Saturday. South & south-east England stays dry, with variable cloud, and some fog patches forming. Blustery near coasts in west & east. Dry for much of Scotland & Northern Ireland, with local coastal showers. Slight frost in rural Scotland. Lows 0 to 4C north; 7 to 11C south.

Saturday
Low pressure and a slow-moving front affects central-southern Britain. Wet and cold in a swathe from south-west to north-east across England & Wales. The area of rain will drift slowly south-eastwards, with some heavy and persistent falls. The far south-east may stay dry until afternoon. Brisk northerly winds. Scotland, Northern Ireland & northern England will be dry with sunny spells. A few showers around coasts. Highs 14 to 16C south-east, 10 to 12C north. Just 6 to 9C in rain.

Sunday
A ridge of high pressure topples across Britain and Ireland, bringing a fair day to many places with good sunny spells. Remnants of rain from Saturday may affect the far south of England in the morning, but will clear. A fresh north-easterly wind will affect south-eastern coasts. Meanwhile, a freshening south-westerly will affect the north & west of Britain & Ireland, reaching gale force some coasts and over the hills. Rain moves into western Scotland, becoming heavy. Highs 10 to 15C.