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Temperatures are set to tumble over the Bank Holiday weekend, while rail and road passengers are warned to prepare for disruption and delays.BBC weather forecasters warn of cold winds and rain over much of the UK, although some areas will see some sun.
Engineering work is set to take place on lines used by nearly all the major UK rail companies.
The AA has predicted congestion on the roads as people visit DIY stores and garden centres.
'Dry affair'
BBC weather forecaster Peter Gibbs said temperatures were on a "definite downward trend" as the weekend got underway and there would be a return of "significant rain" in England and Wales.
Although there would be some sunshine, cold winds and night frosts were to be expected.
He said the Bank Holiday Monday would be a "dry affair" generally but there would be winds coming in from a northerly direction.
Network Rail has said a number of tracks will be closed during the three-day holiday, but the works are part of its £35bn, five-year investment programme.
It said that work will be undertaken on more than 300 projects and the National Rail website lists service alterations for 23 of the 28 UK train companies on either Saturday, Sunday or Monday.
In London some services out of Liverpool Street station and the Thameslink route are affected.
Elsewhere, trains will be diverted between Rugby and Birmingham, and also between Swindon and Bristol.
'Grass-cutting'
Network Rail advised people to plan their journey in advance and check before they travel.
There is planned engineering work on nine of the London Underground Tube networks. The Jubilee line will be closed for three days.
Hundreds of motorcylists in Manchester are expected to take part in a protest against high petrol prices later on Saturday.
Greater Manchester Police said they will try to minimise any disruption casued by the "May-Hem" event, but warned drivers to be aware of "significant delays" in the area.
A planned strike by AA patrol staff will no longer be taking place this weekend but the company has warned people to plan their journeys in advance.
AA president Edmund King said: "This Bank Holiday is often referred to as a "grass-cutting weekend" as people tend to stay at home.
"They tend to travel further afield over the later Bank Holidays when the weather is a bit warmer.
"However, we expect many people will take a chance with the weather and travel, so there will inevitably be some traffic building up on popular routes."This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.