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

Saturday Night
A rather cloudy evening and night across Scotland, Ireland and northern England, with some light rain gradually moving eastwards. Further southeast, central and southern England will remain dry with clear spells. Minimum temperatures of around 15C in the north and 17C in the south.
 

Sunday
A couple of weather fronts will bring outbreaks of rain across 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 largely dry. Highs of 30C in the far southeast, but a much cooler 16C in the northwest.

Monday
The day will begin rather cloudy across Scotland, with perhaps a little light rain, but this should clear fairly quickly. High pressure will then build from the south, bringing dry and sunny conditions to most areas. Later, cloud will thicken across Ireland, with strengthening winds and some light rain reaching western coastal areas towards the end of the day. Highs of 25 to 27C in the south and 14 to 16C in the northwest.