Londoners sunbathing in St James park in June 2006
© AFP/FileLONDON (AFP) - Temperatures of 37 degrees Celsius are expected in southeast England and forecasters at Britain's Meteorological Office say one or two areas could experience 39 C (102.2 degrees Fahrenheit).
That would beat the previous high of 38.5 C, recorded at Faversham in Kent, southeast England, on August 10, 2003, and make parts of the Britain hotter than Spain or Greece.
A Met Office spokesman said the present heatwave was due to a period of very settled weather.
"Over coming days, even hotter air will move across from continental Europe causing the temperature to rise even further," he added.
"Our research shows that there is a significant human contribution to these heatwaves because of carbon dioxide emissions over recent decades.
"This is a sign of things to come, with the current temperatures becoming a normal event by the middle of this century."
Forecasters expect Britain to cool down by the weekend but predict that temperatures will remain above average for the rest of the month.
Bookmaker William Hill said it would have to pay out 100,000 pounds (145,000 euros, 182,000 dollars) to punters who have bet on the temperature if the thermometer hits 38 C.
The average maximum temperature for July is 23 C.
©AFP