London is set to hit 26C on Sunday in what could be the year's warmest day, but thunderstorms may quickly follow, the Met Office warns.
Sunbathers enjoyed the weekend sunshine, with Friday and Saturday becoming 2024's warmest days so far at 24C and 25C respectively in London.
Saturday saw this year's highest temperatures, but Met Office meteorologist Simon Partridge said these records “won't last long” with even warmer weather expected Sunday.
He added: “The difference tomorrow is that it is not likely to be as warm for Northern Ireland, Wales or Scotland.
“The really warm air will probably be confined to southern and eastern parts of England, with temperatures expected to peak in central parts of the country at around 27C.”
Parts of the UK will be warm and humid in the morning before thunderstorms and heavy rain are expected in the afternoon.
There are three yellow thunderstorm warnings in place on Sunday.
One covers most areas of the west of the UK, including the majority of Wales, where thunderstorms are expected between midday and 10pm.
The second is for the western half of Northern Ireland between 11am and 7pm.
The third is for western parts of Scotland between 2pm on Sunday to 4am on Monday. Mr Partridge said this warning is slightly different as more significant rainfall is expected.
People in areas with a yellow warning should expect some disruption, especially to travel.
Spray and sudden flooding could lead to difficult driving conditions and there is a slight chance of power cuts, the Met Office said.
On Saturday, temperatures peaked at 25.9C in Herstmonceux, East Sussex, and in northern Scotland a temperature of 25.7C was recorded in Cassley.
Gogerddan in Wales saw 25.1C, while temperatures in Northern Ireland peaked at 23.8C in Magilligan.
Temperatures climbed steadily over the week, with the previous record set on Thursday, with a peak of 24.6C in London’s St James’s Park.
The Royal Life Saving Society UK has warned warmer weather is directly linked to an increase in fatal drowning incidents.
On Friday, 17-year-old Ronalds Abele died after getting into difficulty while swimming at the Embankment, in Wellingborough, and was pulled from the water by emergency services, Northamptonshire Police said. He was pronounced dead in hospital.
