Britons who basked in record-breaking Easter temperatures are set to get a jolt back to reality as they return to work or school this week.
The UK is in for another unseasonably warm day on Tuesday with temperatures expected to hit 22C in the south and the high teens in the north.
But thunderstorms, hail, below-average temperatures and 60mph winds are set to bring a dramatic end to the spring heatwave that Britain has enjoyed for almost a week.
Heavy and thundery rain is forecast over the next few days, raising fears of flash floods that could threaten homes and disrupt travel.
All four of the UK nations have recorded their warmest Easter Monday on record, with 25C recorded at Heathrow and Northolt in London, and in Wisley, Surrey, as warm air was blown in from mainland Europe.
Tuesday got off to a chilly start in the north, where temperatures were slightly below freezing in the Scottish Highlands.
But the day will be mostly dry, sunny and warm in many places.
The UV level will be moderate and pollen level will be high across most of the country.
Hazy conditions were reported around Greater Manchester and parts of Yorkshire due to smoke from wildfires.
Showers could be thundery across the far west and southwest in the morning and later in the day, the Met Office said.
It will be cloudier, cooler and breezier along some North Sea coastal areas.
Overnight, rain could be heavy and thundery as it moves north from the southwest.
Fog is expected over hills in the north and east.
Many places will see thunderstorms from Wednesday to Saturday as temperatures slide to about 14C in the south and 10C in the north.
Turbulent weather could hit at the weekend.
The Met Office said there will be heavy rain and a risk of gales especially in the west and southwest.
Thunder and hail are likely with temperatures colder than average.
The sudden change in conditions comes after England, Northern Ireland, Scotland and Wales all set new temperature records for Easter Monday.
In England, spring sunshine saw highs of 25C at Heathrow and Northolt in London, and Wisley in Surrey, beating the previous English record of 24C in the Solent in 2011.
Temperatures reached 24.2C at Kinlochewe in the Scottish Highlands, 23.6C in Cardiff and 21.4C in Armagh.
The highs beat the countries' previous Easter Monday records of 21.4C at Culzean Castle on Scotland's Ayrshire coast in 2014, 23.2C in Nantmor in north Wales in 1984, and 21.1C in Northern Ireland's County Fermanagh in 1984.
Wales, Scotland and Northern Ireland also enjoyed their warmest Easter Sunday on record.
The Easter heatwave sent Britons to beaches and parks to soak up the spring sunshine.
However, firefighters were called in to battle a large moor fire near Huddersfield, West Yorkshire.
The National Trust said the blaze, covering 300 hectares of Marsden Moor, is likely to have been started by a barbecue on Sunday.
Met Office five-day weather forecast
A mostly dry, sunny and warm for many.
The chance of showers across the far west and southwest first thing and again later in the day, possibly thundery.
It'll be cloudier, cooler and breezy along some North Sea coastal areas.
Becoming increasingly cloudy across southwestern areas, with outbreaks of rain, locally heavy and thundery, moving north.
Elsewhere, mostly dry and cloudy, with some hill fog over northern and eastern parts.
Thundery downpours moving northwards during the day.
Low cloud may affect some North Sea coasts.
Drier, brighter and fresher conditions following to the south, with further thundery showers later.
Thursday to Saturday
Thundery rain clearing north Thursday, with heavy, thundery showers following.
Further heavy and thundery showers Friday.
Possibly a spell of wet and windy weather arriving in the west on Saturday.
Gales and heavy rain
The Met Office says Britons can expect heavy rain and a risk of gales at the weekend
Here is the outlook for Saturday 27 April to Monday 6 May: "Next weekend could be very unsettled, with often heavy rain and the risk of gales, especially in the west and southwest.
"Thunder and hail are likely at times and temperatures will mainly be on the cold side of average.
"Thereafter, for the remainder of April and into early May, unsettled conditions are likely to dominate, with a chance of showers or longer spells of rain and some periods of stronger winds, especially in the west and southwest.
"Whilst some rain is expected at times, there could be a shift towards more settled conditions later.
"Temperatures will most likely be near normal in the west, and slightly warmer than the seasonal average in the south and southeast."
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