Bank Holiday Monday is forecast to be the hottest since records began.
Temperatures could hit 29C (84.2F) as people round off their three-day weekend - making it the hottest in 40 years, according to Sky weather presenter Jo Edwards.
She said: "We've got two records to break this bank holiday weekend.
"The first, for hottest spring Bank Holiday Monday, is almost a dead cert now! The figure to beat is 23.6C (74.5F) while the figure forecast for the day is 27C (80.6F).
"In fact, there’s a 30% chance of some sheltered spots actually registering 28C (82.4F) or 29C (84.2F) on Monday which would be a very firm victory."