High pressure dominates on Saturday with a northerly flow bringing cool conditions and sunny spells. Showers are likely over northern and eastern parts of Scotland, spreading into northwest England and over the Pennines through the afternoon. These may merge in places to give longer spells of rain. A slight chance of light scattered showers for central and southern parts of England too through the afternoon. On the whole, it will be dry for most and feeling cool. Highs at 15 to 17C for Scotland, Northern Ireland and Wales; 19 to 23 or 24C across Ireland and England.
Showers and outbreaks of rain will ease into Saturday night leaving a dry night for the British Isles. Cloudier skies over eastern areas with clearer conditions to the west. Overnight lows ranging from 7 to 13C.
High pressure looks set to dominate over the UK and Ireland on Sunday too bringing further dry weather with good spells of sunshine. There is a low risk of a shower forming over southwestern parts of the UK on Sunday but these should be light and fairly isolated. The best of the sunshine over the island of Ireland and the north of Scotland. Temperatures rising to between 19 and 23C but much cooler on eastern coasts at just 15 to 17C.
High pressure should bring another fair day on Monday. They will be plenty of sunshine and it should be dry for most. The best of the sunshine in the northeast and along eastern coasts. Low pressure will bring building cloud from the west and could bring a spot of light rain into far western parts of Ireland and the UK through the late afternoon. Temperatures at 19 to 22C in the west, cooler at 15 to 17C in the east.