But in spite of fears of a second wave of coronavirus infections, government ministers are reluctant to close the beaches.
Matt Hancock said on TalkRadio that he had the power to do so, but was "reluctant" as "people have had a pretty tough lockdown".
"We will take action" if there's a second spike in cases, he added.
Environment secretary George Eustice also expressed reluctance to close the beaches, instead urging people to follow social distancing guidelines.
Speaking to the BBC, he said:
We just have to recognise yesterday was the hottest day of the year, incredibly hot, a lot of people had the same idea, they all went to the beach, and yes of course those scenes at Bournemouth are a matter for concern.
The British weather being what it is maybe that will be short-lived and people will return to the type of social distancing they've actually demonstrated quite well.
But Bournemouth council leader Vikki Slade has warned that their services are "stretched to the absolute hilt trying to keep everyone safe". She said:
The numbers of people descending down here are like those seen on a bank holiday. We are not in a position to welcome visitors in these numbers now. Please do not come.
Chief medical officer Chris Whitty has warned that coronavirus cases "will rise again" if social distancing guidelines are ignored.
The UK's official death toll from coronavirus is now 43,320, a rise of 149 since Wednesday.
The government are urging people to remain two metres apart, and only to visit the beach with members of their own household.