Sunday
Lower pressure east of Scotland on Sunday. Cooler weather with some cloud and showers and rain across Scotland, edging into Northern Ireland as well. Drier and brighter for England, Wales and most of Ireland, but scattered showers developing here later. These showers turning heavier in Wales, the Midlands and East Anglia as well as parts of northern England through the afternoon. Drier in the far south of England with the best of the sunshine here. Highs at 10 to 15C in across Ireland, Northern Ireland, Scotland and into the northwest of England; 15 to 21C across the rest of England and Wales.

Sunday Night
A band of light, patchy rain edges south across central and southern parts of England and Wales overnight while showers spread across parts of Scotland. A mostly dry night for Ireland, southern Scotland and northern England and this is where we'll find the clearest skies and coldest temperatures at 0 to 5C. A less cold night for England and Wales with lows widely at 6 to 10C here.

Monday
A weak front bringing cloud and some scattered showers in England and Wales through Monday. There will be some brighter or sunny periods here too. Cloud and some showers across Ireland, northern England and Scotland too, those showers may merge into more persistent rain in places. Feeling cooler for all with highs at 9C in northern Scotland, 17C in southern England.
 

Tuesday
A slack pressure flow across Ireland and the UK on Tuesday. There could be some cloud and showery rain moving through Wales and southern England. Northern England, Scotland and Ireland will have sunny spells, but some showers forming over higher ground, especially in Scotland. Highs at 10C in northern Scotland, 15 or 16C in southern England.