“It may be hotting up for some as 28C and 29C are possible in East Anglia in the southeast on Saturday”
Met Office experts predict hot air from the south will send temperatures rocketing later today.
BBC Weather meteorologist Chris Fawks said: “It will be cloudy but a mild start to the day with a little bit of dampness around, particularly western areas.
“Towards Thursday afternoon some more general rain will spread into Northern Ireland, Scotland and northwest England with that rain setting in as it turns heavier.
“Where cloud breaks across eastern England it will become quite warm.”
It could even reach 15C in London before the mercury continues to rise as we head into the weekend.
But other parts of England could expect to feel highs of 23C while regions of Scotland and Northern Ireland will hover around the low teens.
The climbing temperatures will continue to rise, sparking a potential heatwave on Saturday and Sunday.
Alex Deakin added: “The warmer air is pushing up across the south but notice it doesn’t get to everyone.
“It is going to warm up for some with the peak of the temperatures in England and Wales on Saturday but the cooler conditions persisting in the northwest corner.
“It may be hotting up for some as 28C and 29C are possible in East Anglia in the southeast on Saturday.
“The weekend shapes up with some warmth and sunshine for many but not all and we could see some thunderstorms developing on Sunday as well.”
Should the prediction hold it would smash this year’s record of 25.8C set on April 19.