
Half a month's rain could fall in a single day in parts of the country this week.
The South West and Wales are likely to be the worst affected, with up to 25mm on Tuesday.
Towards the end of the week there will be spells of sunshine and showers, with temperatures climbing to 15C (59F) or 16C (61F) in London on Thursday and Friday.
The maximum for Tuesday in London will be 12C (54F).
Matt Dobson, a forecaster with MeteoGroup, the weather division of the Press Association, said towards the end of May we would see a return to more "settled" weather.
He said: "There is some rain on the way. Tuesday is looking like the wettest day of the week for southern parts of the country.
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