The bank holiday weather has proved to be a washout with rainfall topping 50mm (2in) in some areas overnight.
The Bank Holiday weather has proved to be damp and cool
Forecasters said the holiday weekend was one of the wettest across central and southern England in recent years.
St Catherine's Point on the Isle of Wight saw the most rain overnight, with 52mm (2.05in) of rain over a 12-hour period between 1800 BST and 0600 BST.
Temperatures on Monday were forecast to be between 8C and 9C (46F to 48F) in central and eastern areas of England.
Elsewhere temperatures will be between 10C to 13C (50F to 55F).
The best sunshine is forecast to be found in the far west and south west of England, west Wales, west Scotland and much of Northern Ireland.
A Met Office forecaster said it was one of the wettest Bank Holidays in recent years.
"The rain today is mainly across central and southern England," he said. "It will clear eastwards and will come back into Scotland tomorrow."
He added that southern Britain should see some sunnier spells on Tuesday, but Wednesday would see more rain sweep into the south west, and Thursday and Friday would have further cloud and showers.
The Environment Agency has several flood watches in place, particularly in the south and the Midlands.
Sunday's constant rainfall prevented any play in the second Test between England and West Indies at Headingley, and Monday's match was interrupted by hail showers.
The second day of the Royal Air Force's Spirit of Adventure airshow at Abingdon airfield in Oxfordshire was called off due to rain and low cloud.
Luton International Carnival, which was expected to be attended by more than 100,000 people, has been cancelled due to the bad weather.
But the wet weather did not prevent about a quarter of a million scouts from braving the downpours at the start of celebrations to mark the movement's centenary.
Scout camps have been set up around the country this weekend to mark the start of the movement, begun by Robert Baden-Powell.
The AA said that the roads were busier than usual over the weekend, revealing it was called out to 11,000 breakdowns on Friday compared to the usual average of 9,500.
A Highways Agency spokesman said there had been some minor traffic incidents where the weather was wet.
He advised drivers to watch out for road spray and slow down.
The Association of British Travel Agents (Abta) said that about 1.9m Britons have left the bad weather behind by flying abroad for the bank holiday.
The top five city-break destinations were Paris, Amsterdam, Dublin, Rome and Prague.
A spokesman for Stansted Airport said 300,000 people would leave and return to the airport over the weekend.
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