Floods are predicted across the South of England while dry spells mixed with sudden storms could dominate the Northern regions.
The South will be hit by outbreaks of rain throughout the day, with downpours predicted to be worst in the Midlands and East Anglia.
Muggy temperatures could scrape 14C in the South, but are likely to average around 9C.
There will be more sunshine in the North, but isolated storms could bring outbursts of hail and thunder throughout the day.
A week after Brits basked in glorious sunshine, conditions will dramatically worsen over the next few days.
Light downpours are predicted today, but from Sunday evening a low pressure system from the East will bring up to 70mm rainfall on Monday.
The Met Office has issued yellow weather warnings from Sunday through to Monday for the East Midlands, East of England, London and the South East, as well as Yorkshire and Humber.
And flood alerts are currently in place for the South East, South West and the Midlands.
Tonight temperatures will drop to a minimum of 5C as further outbreaks of rain and drizzle will hit the North, with some possible in the South.
Last night's frost in Scotland could return tonight, but showers will largely die out across the UK, paving the way for a grey and damp day.
The felt temperature could be several degrees colder as winds batter the UK, ahead of a few wet and windy days.
Helen Roberts from the Met Office said the April showers were "not unusual for this time of year."
She said: "Bright spells should be fairly limited to the Western fringes today, and there'll be a lot of cloud.
"There'll be less rainfall tomorrow, but a low pressure system from the East will bring further wet and windy weather on Monday."
Between 20-40mm rain is expeceted to fall in the UK on Monday, with up to 70mm in the Scottish Highlands – potentially a whole month of rainfall in one day.
The weather is set to become dryer towards the end of next week, when Brits will be hoping for a warmer Bank Holiday weekend.
Last week Brits enjoyed glorious highs of 27C and last Sunday, the hottest London Marathon since 1949.
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