On Tuesday a strengthening southerly wind will bring a much warmer day.
Temperatures in the high teens are forecast in Scotland and Northern Ireland, and between 20 to 26 C for England and Wales.
However rain will move into Northern Ireland during the afternoon and then trek slowly eastwards throughout the evening and night. It may become persistent and occasionally heavy, with strong winds and gales for exposed coasts and hills.
Further east, drier and brighter conditions may remain before the rain arrives on Wednesday – it could possibly linger overnight.
Behind the rain it is back to sunny spells and scattered showers, and still windy in the west on Wednesday.
By Thursday, we are expecting high pressure to build, so it should be calmer and drier, and by Friday the north-west becomes the focus for any showers.
Of course the caveat is that forecast details may change, so you can stay up-to-date with the short term forecast for your area here.