A final dose of sun will give way to a two-week deluge as autumn roars in.
The South will be hotter than Ibiza today, with a 700-mile-wide “tropical thrust” bringing sweltering 27C highs.
The Weather Outlook forecaster Brian Gaze noted: “Saturday looks toasty for the South.”
READ MORE: Exactly where in UK 'will feel like 30C' this weekend as hot weather blast continues
Sunseekers grabbing their last day at the beach are set to pack beaches in Bournemouth and Brighton with a combined 200,000 visitors.
And Tesco is expected to flog 1.5million packs of sausages, 1.5m burgers and 4m ice creams.
But conditions are already cooler in the North, with highs of just 18C predicted along with grey skies and outbreaks of rain.
And forecasters have warned it will be all downhill from here. Ladbrokes slashed the odds on the wettest day of the year coming before the end of this month from 5-1 to 3-1.
Spokesman Alex Apati warned: “Things are about to take a complete turn for the worse, with record-breaking rain ready to batter Brits.”
As we reported earlier, warm weather will return to Britain this weekend with some places set to "feel like" 30C.
It comes following a week-long heatwave last week when temperatures exceeded 30C for seven consecutive days.
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Although actual temperatures don't look likely to reach those highs again, wind conditions and humidity are expected to make Saturday (September 16) feel much hotter than it actually is, especially in southern-central regions and the south-east.
According to data from Netweather's "feels like" readings, 26C heat tomorrow afternoon in both Southampton and Oxford will be more like 30C.
Rebekah Sherwin, deputy chief meteorologist at the Met Office, said: "The notable change in our weather occurs through Saturday evening as increasingly humid air moves up from the south bringing thunderstorms and heavy downpours.
"These heavy showers and thunderstorms will spread across much of the UK through the day on Sunday with nowhere immune from the chance of seeing them.
"Some downpours could lead to impacts on the transport network and with thunderstorms likely in places some temporary power disruption is possible.
"There is also the risk of hail and strong winds in places. It is likely that severe weather warnings will be issued as the confidence over the most likely areas to be affected increases. Stay up to date with the weather in your area, as forecasts can change quickly."
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