FORECASTERS have warned snow could start falling tomorrow as temperatures plummet and "cold Arctic air" sweeps across the UK.
Brits are set to bask in 22C temperatures today before the mercury dips.
The Met Office yesterday predicted when summer will finally hit, after an unsettled start to the warmer season.
And while parts of the country will still enjoy temperatures in the low 20s today, forecasters warn they won't last for long.
Met Office meteorologist Annie Shuttleworth said snow could fall in the Scottish Highlands tomorrow.
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She said: "Cold air continues to dive south and eastwards through the night on Tuesday night into Wednesday.
"And this occluded front brings a focus of some quite heavy showers through Wednesday morning.
"Those showers could fall as snow over the high ground of Scotland, which is not that typical for early summer but isn't completely unusual.
"Snow is only really expected over and above 600 meters in Scotland."
Ahead of the white stuff's possible arrival, Brits will get a taste of summer.
Londoners will enjoy 22C temperatures from 1pm today, while Norwich will be basking in 21C.
But the Met Office has warned cold Arctic air will cool things down across the UK.
Forecasters said: "After a warm weekend, things are set to change this week as we introduce a cooler northwesterly flow of air."
It showed that as the week goes on Scotland's temperatures will dip to 13C on Thursday, while London will drop to around 17C.
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The Met said in its five-day forecast said the weather would become unsettled from tonight.
Forecasters said: "Rain will clear the southeast during the evening.
"Staying windy in the north with scattered showers, hail is possible in Scotland. Dry in the south overnight with clear skies. Chilly."
The Met Office said tomorrow would likely be "cool and breezy" in the north, but there could be sunny spells and blustery showers.
It said the south would likely be dry with sunny spells, with the odd shower.
The Met last night revealed when it thought summer would finally hit.
Forecasters said there will be some unsettled weather patterns and intermittent downpours until late June.
Next week could bring some blustery showers to those in the north with "changeable" weather patterns expected amid "drier interludes".
But the forecast suggests southern parts of the UK will experience a "good deal" of dry spells.
Temperatures are likely to take a dip mid-June for most, but by the end of June, meteorologists are predicting them to rise above average.
Hay fever suffers have also been advised to keep an eye on pollen levels this week as the mercury rises.
The National Pollen and Aerobiology Research Unit said: “Grass pollen has a very high risk in the South, Midlands and Wales on sunny days in warm weather.
“Expect the high risk to arrive in the North from June 3.”
It comes after Brits soaked up the sunshine on Sunday, with temperatures hitting 23C in parts of the south east.
This was in stark contrast to torrential downpours last week which sparked danger to life and flood warnings across the UK.
Heavy rain saw rail services cancelled and delays, as well as travel chaos on the roads.
