With temperatures set to reach highs of 26C (79F) over the bank holiday weekend, councils with responsibility for beaches and beauty spots are warning people to keep away.
Pictures of crowds flocking to beaches in Brighton and Southend in recent days have raised concerns over social distancing.
Following the easing of some lockdown measures last week, there are no restrictions on how far people can travel to get to the countryside, National Parks and beaches in England.
The Met Office is forecasting that temperatures could hit 26C (79F) in London on Monday, with coastal areas likely to see highs of around 20C (68F).
Saturday is expected to be the coldest day, before the mercury climbs on Sunday and Monday, with wall-to-wall sunshine in the west and sunny spells in the east.
Councillor Carmen Appich, from Brighton & Hove City Council, urged anyone thinking of travelling to the city "to consider very carefully how their journey will impact on others".
If youre thinking of visiting the coast in Devon this bank holiday, please #thinktwice about the distance you're travelling & if you could stay closer to home? Overnight stays are not permitted & you must always keep to social distancing to protect local communities.#WeAreDevon pic.twitter.com/pP1lhfhyPh
— Devon County Council (@DevonCC) May 22, 2020
Hastings Borough Council said the area is "closed to visitors from outside the town".
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Holidaymakers are being told that the "clear advice" from the Isle of Wight Council is they should stay away.
People are similarly being advised not to visit Blackpool and Morecambe Bay to help prevent the spread of COVID-19.
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."
"Wish you weren't here!" is Sefton Council in Merseyside's take on the picture postcard message it is sending to people thinking of travelling to its beaches from across the North West.
— seftoncouncil (@seftoncouncil) May 22, 2020
In Cornwall, council leaders warned there is no lifeguard cover and a large coastal swell and spring tide will bring hazardous sea conditions over the weekend.
Rob Nolan, cabinet member for environment and public protection at Cornwall Council, said people should not be holidaying in Cornwall and must return to their "principle residence" each night.
Devon County Council asked people to "think twice" about visiting the coast and to consider if they could remain closer to home.