Summertime highs are expected on Sunday as parts of Britain are likely to enjoy the hottest day of the year so far.
A top temperature of 25C (77F) is forecast for the south east of the country, which would eclipse this year's record of 22.1C (72F).
After a sunshine-filled day and cloudless skies for most on Saturday, fortunes are set to change in some parts with the weather returning to normal for spring.
There will be a north-west, south-east split on Sunday, as conditions cool for Scotland and Northern Ireland, before other parts see a dramatic 10-degree drop on Monday.
Met Office forecaster Emma Boorman said: "From Monday onwards it's really all-change.
"The rain and cloud across the far north west is associated with a cold front.
"That will be making its way to the south east during Sunday night and introducing a much colder feel as we head into the start of the new working week.
"Temperatures in some places, for example, could be a solid 10 degrees cooler on Monday than they were on Sunday."