High pressure will expand eastward across the isles on Tuesday, bringing seasonable warmth and generally tranquil conditions.
Skies will feature broken cloud and sunny spells across Wales and England as a light to moderate breeze blows from the west and southwest.
Across Scotland, clouds will limit sunshine with a few, isolated showers.
High pressure will remain mostly in control on Wednesday with dry conditions for most locations except for far southern England, where a thundery rain will develop throughout the day.
Clouds will increase from south to north across the Isles on Wednesday night as a thundery rain moves northward out of Spain.
Rain can be heavy at times across Wales and England on Thursday with the potential for flooding, mainly in low-lying and poor drainage areas.
By Ben Noll, Meteorologist