A Spanish plume will sizzle Brits with scorching temperatures and a 26C heatwave, according to weather maps.
But before that arrives, heavy downpours will drench the UK and bring a dreary washout weekend.
Warmer skies have appeared across the country on Wednesday, allowing families to soak up the sunshine after days of rainfall.
Brits made the most of heading to the beach and the glorious temperatures before more rain hits from Friday.
The Met Office prewarns that "thundery showers" will sweep across the south today, and a month's worth of rainfall could lash those living in the south east.
Downpours will also persist in Scotland and north east England, with the mercury set to dive on Friday as well.
Saturday and Sunday are predicted to feature overcast skies with areas seeing rain and showers down south, as a band of rain sweeps in.
Monday doesn't look much brighter, with the weather agency expecting more heavy rain in the south again.
But, mercury is forecast to soar across the UK following the dreary weekend washout.
Next week will see rocketing temperatures which are expected to continue into July.
The warmer skies are down to a high-pressure front moving in from western ad northern Europe.
A slow-moving jet stream of air will bring warm weather and create pockets of high pressure as it moves across the country.
Temperatures are expected to increase from Tuesday onwards, with a high of 23C likely for England's Euro 2020 game at Wembley if all goes to plan.
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The mercury is then set to soar to 24C on Wednesday and could reach a high of 26C or the remainder of the week.
Also, heat maps show highs of almost 30C later on in the month.
BBC long-range forecasts predict that 'several' or 'multiple' heatwaves will occur in July, following on from the sizzling weather Brits saw at the beginning of June.
Manchester, Coventry, and parts of the north west could see 28C on July 5, and the Yorkshire Dales and Leeds predicted 27C on the same day.
Whereas, further south in the likes of London, Kent, and Essex, basking in 25C.
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