Forecasters are expecting the mercury to hit 30C this weekend in the UK higher than parts of Spain and the South of France.
A Met Office spokesman said the summer temperatures are on their way, but not before a potential frost.
Grahame Madge said, “The indication is that we could see highs of 28C (82F), isolated highs of around 28C, on Saturday, and the most likely candidate places for those would be places like Norwich, north London, those sorts of areas away from the coast, but in the south-east corner of the UK.
“And on Sunday we could see highs of 29C (84F), even possibly 30C.
“So, Sunday looks very much as though it’s going to be a warmer day than Saturday. So we have got that warmth coming through.
“Once this warm front, and the air behind it, starts to pull across the UK then we will see temperatures starting to rise.”
He added, “Tonight, for example, some parts of England could see a frost before this warm front starts to work its way across.
“We’re expecting its arrival overnight so probably getting into the western parts of Britain by just after midnight.
“And then it will work its way across, reaching all parts of the UK by later in the week and the weekend.”