Warmer temperatures will return on Sunday after a wet and windy start to the bank holiday weekend for much of the UK.
But forecasters say temperatures could reach highs of 26C in London on Monday, with coastal areas likely to see highs of around 20C.
After a day of cooler temperatures on Saturday, the mercury is expected to climb on Sunday and Monday, with wall-to-wall sunshine in the west and sunny spells in the east.
Many areas will still see scattered showers throughout the weekend, the Met Office said.
On Sunday, many northern and central areas will start the day with clouds, but light spells of rain will fade and skies will start to brighten.
Southern England and Northern Ireland should see sunnier conditions and it will feel warmer and less windy, the Met Office said.
Monday will be warm and mostly fine for southern areas, forecasters said.
Rain in the far northwest will move southeast into central areas on Tuesday with brighter drier weather expected for the rest of the week.
But Brits are being warned to stay away from beaches and continue to abide by social distancing measures as sunny weather returns.
Councillor Carmen Appich, from Brighton & Hove City Council, has urged anyone thinking of travelling to the city “to consider very carefully how their journey will impact on others”.
Hastings Borough Council meanwhile has said the area is “closed to visitors from outside the town”.
Holidaymakers are similarly being told that the “clear advice” from the Isle of Wight Council is they should stay away.
After pictures showed crowds at Southend in Essex earlier this week, the council’s leader said the easing of lockdown restrictions has put the council in a “very difficult position”.
Councillor Ian Gilbert said on Friday: “For many weeks we ran a successful Don’t Visit Southend campaign, but the Government’s lifting of restrictions have put us in a very difficult position as day trips and sunbathing are allowed, and takeaways can be open for business.”