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.
She said: "Cold air continues to dive south and eastwards through the night on Tuesday night into Wednesday.
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"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.
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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.
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.
Brits enjoyed warmest & wettest spring
By Emily-Jane Heap
BRITAIN had its warmest spring on record — but the wettest in nearly 40 years, the Met Office says.
Provisional figures suggest the average temperature in May was a balmy 13.1C — beating the previous record from 2008 by a whole degree.
The average spring temperature was 9.37C, topping the previous record of 9.12C in 2017.
But the UK also saw 301.7mm of rain between March and May — almost a third more than usual — making it the wettest springtime since 1986.
A Met Office spokesperson said: “While it may not have felt like it for many, with sunshine in relatively short supply, provisional figures show May was the warmest on record in our series back to 1884.
“This warmth was especially influenced by high overnight temperatures, with the average UK minimum temperature for May 1.2°C higher than the previous record.
“Rainfall was above average for the UK, while some areas in the south saw over a third more rain than average."
In contrast, Northern Ireland and Scotland were slightly drier than average in the month.
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.
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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.
Met Office's forecast:
Today:
A band of rain will sink south today, turning heavy at times. Sunny spells and heavy showers later in the north. Staying dry, bright and warm in the southeast at first. Turning increasingly windy through the day and feeling cooler.
Tonight:
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.
Wednesday:
Cool and breezy in the north with a mixture of sunny spells and blustery showers. Largely dry in the south with sunny spells and perhaps just the odd shower.
Outlook for Thursday to Saturday:
Breezy with showers in the north. Mostly dry in the south with sunny spells, and just the odd shower. Cool in the north, but gradually turning warmer in the south.
June 8-June 17:
Blustery showers continuing across the north of the country over the weekend, most frequent in the northwest, but may tend to ease compared to preceding days. Showers possible across southern areas but often dry with variable cloud and sunny spells. Likely remaining changeable across the north through following week and into mid-June with showers or longer spells of rain at times but also some drier interludes. Whilst showers remain possible in the south, there should continue to be a good deal of dry weather here. Small chance of a more widely settled spell developing for a time next week. Rather cool at the start of the period, temperatures probably slowly recovering back to around average with an increasing chance of some warmer spells, especially across the south.
June 18-July 2:
Signals are weak, as is common for this time of year, regarding prevailing weather patterns during the last couple of weeks of June and into the start of July. As is typical, all areas can expected to see some spells of drier, sunnier weather but there will also be showers or longer spells of rain at times. The balance between drier and wetter spells is unclear, if anything for most regions, wetter than average is slightly more likely than drier than average for the period as a whole. Temperatures around or a little above average is most likely. Some warmer spells are possible but there are no meaningful signs regarding if and when they may occur.