Showers could dampen some street celebrations over the Diamond Jubilee weekend, but the Queen's Thames river pageant is set to be dry this Sunday.
Cooler, wetter and windier weather is bringing the heatwave of the last week to an end, and experts are predicting a mixed outlook for the bank holiday break.
Tom Tobler, a forecaster from Meteogroup, the weather division of the Press Association, said: "Through the Jubilee weekend it will feel a lot cooler than the warm weather of recent days.
"On Saturday, some places could get temperatures into the high teens in southern and central England. But further north it will be cooler.
"It should be mainly dry across the country with a fair amount of cloud around. The best of the sunshine will be in northern and eastern parts of the country."
The Queen will probably be in one of the pockets of better weather for her trip to the Epsom Derby on Saturday, with temperatures reaching about 17C.
But Mr Tober warned a weather front moving into the UK on Saturday night could result in heavy downpours for south-western parts of the country on Sunday.
He added: "The South West will see the heaviest of the rain, but this could spread across southern Wales and central England. The maximum temperatures will be 13-14C on Sunday."
There will be scattered showers across the rest of the country.
Forecaster Julian Mayes said: "It'll be clearer, drier and quite bright generally in the north, working its way southwards. It looks as though the North East and Yorkshire is going to be cloudy and damp, but the South and south-east England will have quite a lot of sunshine."