The UK will bask in balmy climes for another few days but temperatures are set to drop with some parts even likely to see snow before next weekend, forecasters say.
Britain has enjoyed a recent string of warm and sunny days, giving us false hope that summer weather was here.
In some places there has been glorious temperatures of 19C and 20C highs, with seemingly endless sunshine.
But meteorologists say sunshine conditions will end this by Saturday or Sunday.
People will get a "taste of most of the seasons within the space of a few days", a Met Office forecaster has said, as above-average summery weather makes way for more wintry conditions.
Clocks go forward overnight into Sunday, ushering in British Summer Time.
In Glasgow, the temperature is due to drop by half, from 18.7C on Saturday to just 8C by Thursday.
Hill snow is likely to affect some parts of Scotland on Tuesday night, and possibly across the Pennines and Welsh mountains by Wednesday, said forecaster Marco Petagna.
He said: "We'll get a taste of most of the seasons within the space of a few days."
The UK was bathed in sunshine and blue skies again on Saturday, as a warm and dry spell continued.
The mercury reached a high of 20.5C in Porthmadog in Wales, and much of the country is likely to see temperatures in the mid to high teens again on Sunday.
Greater cloud cover across central and eastern England will mean temperatures are down a few degrees, Mr Petagna said.
He added: "But it's still pretty good for the time of year. The average at the end of March would usually only be 9C or 10C in the north and 10-12C in the south.
"So it's still pretty good at the start of the week."
He said there will be a "more notable change" from midweek, with Thursday looking likely to be "a cold day for most" with highs of between 6C and 11C.
In the Met Office's long-range forecast for the UK, which spans from March 30 to April 8, it expects showers to become more prominent, and even says some snow showers may hit northern areas.
It reads: "Becoming more unsettled to start the period, northern areas will see increasing amounts of cloud with a few showers.
"Breezy and feeling cooler than recently in the far north, with the potential for some snow showers at low levels.
"Temperatures near average in the south. Becoming less settled and colder thereafter, with a mixture of sunshine and showers for most, in addition to an increased likelihood of wintry hazards, particularly to the north.
"Nearer to the end of this period, temperatures are expected to gradually recover to average, though overnight frost remains possible during clearer spells.
"Showers or longer spells of rain look to become more frequent, with drier periods most likely to be short-lived."
