There was a soggy start to the Bank Holiday weekend for many today with heavy rain on the eastern side of the country.
By contrast, as expected, western areas were mainly dry.
Brendan Jones, senior forecaster with MeteoGroup, the weather division of the Press Association, said rainfall overnight included 40mm (one and a half inches) around York, including 15mm in one hour at 6am.
"Most of the eastern side of England and parts of eastern Scotland saw rain overnight, and there have been some lively thunderstorms today in Sussex, Essex and Yorkshire," he said.
"We expect the rain to intensify in the south east during the afternoon and to continue until tomorrow lunchtime, tailing off then to give a drier afternoon and evening.
"The west will remain dry with one of two exceptions and east and west should both have warm weather on Bank Holiday Monday, with temperatures rising as high as 25 or 26 in the London area."
There was torrential rain for music lovers at Leeds Festival in Bramham Park, starting late in the evening and continuing through the night.
Festival staff managed to keep the arena passable by covering the ground in woodchips, and as the West Yorkshire site opened to welly-wearing revellers this morning the mud was at least manageable.
Conditions mean it will be a dreary kick-off to the UK's largest carnival tomorrow, with the loud, colourful procession met with rain, improving slightly in the afternoon.
But the weather is unlikely to put people off attending the Notting Hill Carnival, one of the liveliest events on the London calendar.