Weather experts have predicted the exact date temperatures will surge above 20C.
Mercury could hit 21C on June 20 across parts of southern England.
WxCharts suggested London, the West Midlands, Bristol, East Anglia and North East could all experience warmer weather.
However, Scotland and Northern Ireland will continue to experience much milder conditions.
Exact date temperatures to FINALLY surge above 20C
WXCHARTS
The June 20 change comes as England and Scotland football fans will start to enjoy the European Championships.
Pub gardens are expected to accommodate for Three Lions and Tartan Army supporters.
Looking ahead to July 11 to July 20, the Met Office said: “A general continuation initially, of sunshine and showers for many areas, the odd one could be heavy across the south.
“Thereafter a build of pressure will probably bring settled conditions across the country for a few days, with dry, sunny conditions prevailing.
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Britons relax on the beach in Broadstairs, Kent, amid a record breaking heatwavePA “While confidence in the timing of any change of type is uncertain, from the middle of the week towards the weekend dry conditions may start to decline with a greater chance of more unsettled weather developing.
“Should this happen, wettest conditions are likely to be in the north and west, with driest weather in the south and east.
“There is still a chance that drier conditions could remain in place more widely.
“Temperatures likely to be near or slightly below average at first, perhaps slightly above normal later.”
People enjoy the warm weather on Hastings beach in East Sussex. gbnews However, NetWeather also issued an update about hot temperatures arriving in the UK for three months.
NetWeather said: “Overall, June-July-August temperatures are forecast to be warmer than the 1991-2020 long-term average during Summer 2024.”
It added: “July forecast to be the hottest month, perhaps up to 2C above the average.”
Explaining its forecast, NetWeather’s long-range summer forecast in August claimed: “Given the predominant wind direction from southwest or south, temperatures will be above average, but not as much as July, given greater chance of unsettled weather off the Atlantic, but still 0.5C-1C above the 30-year average.
“Rainfall could equally be average or above, but less likely to be below.”
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