A three-day heat alert has been issued as temperatures rise to 34ºC.
The notice covers parts of England from midnight on Friday to midnight on Sunday.
The NHS England and the Met Office have issued a level two heat health alert for the East Midlands, the East of England, the South East and the South West, which means that there are 60% of heat wave possibilities during this period.
A level 1 warning covers parts of the north of England, where the probability of heat wave conditions is 30%, while there is a 40% chance in the West Midlands.
Met Office Chief Meteorologist Dan Rudman said: “Temperatures will continue to rise as we move into the week, well above average on Friday, when many parts of the southern half are likely to rise. The UK is above 30 ° C and even reaches 34 ° C in some places.
“This is the first heat period this year and it is unusual for the temperature to exceed these values in June. Many areas will also see some warm nights with minimum temperatures expected to be in adolescence or even below 20ºC for a few nights.
“The heat is the result of a mixture of heating in the house during the day due to the high pressure, as well as a flow of air from the south that introduces some of the warm air from the continent to the coasts of the United Kingdom “.
Agostinho Sousa, Head of Extreme Events and Health Protection at the UK Health Security Agency, added: “Temperatures are expected to reach 30ºC in some parts of the south on Friday and we want everyone to enjoy the warm weather. safe when you arrive and stay tuned for good health tips for dealing with warmer conditions.
“During periods of heat, it is especially important to continue to monitor the most vulnerable people, such as the elderly and those with heart or lung disease. Be sure to watch for signs of heat exhaustion and follow our simple tips. health to fight the heat “.
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((Steve Parsons / PA))
As of Wednesday, as clouds, rain and wind conditions continue in the northwest, it will become warmer in the south as the pressure increases.
This will lead to stable conditions that will allow temperatures to rise day by day and become warm, or even hot, for a while on Friday.
A UK heat wave threshold is reached when a location records a period of at least three consecutive days with maximum daily temperatures reaching or exceeding the heat wave temperature threshold, which varies by county.
The highest temperature in the UK so far this year is 27.5 ºC at Heathrow on 17 May.
It is still relatively unusual for temperatures to reach 30ºC in June.
The highest temperature recorded in June was 35.6 ºC at Southampton Mayflower Park on June 28, 1976.