Nic Lonsdale, duty watch manager at Portland Coastguard, said: "We are urging people to observe the warning signs and stay away from the edge." The cliffs at Durdle Door and Lulworth have been crumbling since the start of year.
In January, the steps to the famous landmark collapsed. Earlier this month, coastguards warned that the path was beginning to fall away.
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Hundreds of passengers in the south have been arrested on suspicion of being drunk on a plane or at an airport in the last two years.
The Bournemouth Spur Road is to fully reopen after nine months of major works. The A338 has undergone a £22m rebuild.
Friday morning's forecast for the east of the region