It's going to be scorching in the South East of England this Monday, with London seeing a top temperature of 29C at 4pm.
The morning will see a band of cloud with some rain over northern England, Scotland, Northern Ireland and Wales.
Meteorologist Annie Shuttleworth said: "We are forecasting that 29C could be the maximum..."
People enjoy the warm weather on Hastings beach in East Sussex - it's going to be another hot day on Monday.
Andrew Matthews
"If we do see that 29C, it would be the warmest day of the year so far and it would be in the South East."
The Met Office's Aidan McGiven said: "It's going to be an uncomfortable night for sleeping."
Monday evening will see the clouds roll in in the South, however the north of England, Scotland, Wales and Northern Ireland are due a clear night.
On Tuesday there's likely to be rain across the North West, however sunshine will follow interrupted by the odd shower.
It'll be pleasant in Scotland and Northern Ireland on Tuesday, but the South East will once again get the best of the weather with highs of 24C.