How hot?! Heat weather warning as temperatures soar in West Sussex
Experts are warning temperatures could hit 32C in parts of the country.
Another heat health warning has been issued for parts of the UK heading into the weekend as temperatures are expected to soar to 32C.
The UK Health and Safety Agency and the Met Office have put the warning in place from 9am on Friday to 9am on Monday, covering most of England.
The warning covers the South East, South West, East Midlands, West Midlands, East of England, Yorkshire and the Humber, and London.
London is expected to be the hottest part of the UK with potential highs of 31C or 32C, but temperatures will be in the high 20s for large parts of England.
Met Office forecaster Marco Petagna told the PA news agency: "Tomorrow we're looking at a North West/South East split across the UK, with Scotland and possibly Northern Ireland seeing some showering bits of rain, but particularly toward the north and west of Scotland by the looks of things.
"A little bit breezy in the north west there as well but despite that, even with the cloud there, it's going to be a warm day.
"Certainly, the warmest conditions will be developing across England and Wales, and especially towards the South East, with plenty of sunshine developing after a bit of a grey start.
"There's a possibility of a bit of drizzle across western hills, but much of the UK away from the west will be very warm if not hot sunshine during the day.
"As we head into the afternoon we're looking at highs in the north touching 24C or 25C, and in the South East many places getting into the high 20s. London could see 29C, maybe even 30C.
"Sunday is a bit more of an east/west split developing because we're going to see a band of showery rain moving in from the west during the day and could turn quite rainy and thundery, particularly across north western areas.
"Ahead of it, particularly across the east and South East of England another very hot day. Highs in the South East up to 31, possibly even 32C."
The hottest day of the year so far fell on June 10 when 32.2C was recorded in Surrey.
Thousands who are descending on Somerset for Glastonbury will welcome the warm weather, although they could see some rain and thunder moving in from the west.
Mr Petagna said: "For those headed to the festival, tomorrow looks like another fine day, plenty of sunshine there.
"There will be an increased chance on Sunday, from that weather front I mentioned from the west, of a little bit of rain developing across Glastonbury.
"You need to keep an eye on that as it could be very sharp.
"Very warm throughout, temperatures in the mid 20s, 25C or 26C and the fresher air coming in for when things are finishing up on Monday."