BRITAIN'S set for a freak sunny snap over the next 48 hours as temperatures could reach up to 17C.
High pressure from the continent is drawing up warmer air from the south, with most of the country looking likely to enjoy the milder weather.
But it's not to last, as things will take a dramatic plunge towards the end of the week - before snow strikes by the end of the month.
Met Office meteorologist Clare Nasir said: "A puddle of very warm air will stretch across the UK for the next 48 hours.
"Temperatures will reach 15 or 16, and this could grow in areas with more sunshine, especially along the east coast.
"Places with shelter from the southernly breeze will see temperatures rising."
Aidan McGivern, of the Met Office, said: "All areas are going to be relatively mild even despite clear spells for central and southern parts of the country.
"We start off with sunshine but a big contrast for western Scotland.
SPONSORED: Save £100s off your energy bill every year
SWITCHING energy firms can save you hundreds of pounds every year.
Switchcraft finds the best deal for you - and continues you switch you on to cheaper deals, so you never have to do it yourself.
£5 cashback is paid into your bank account within 4 months of completing the switch. Pre-paid meter customers will receive a £5 Amazon voucher. Promotion ends 31/12/18. Open to those 18 and over. UK residents only. Click here for full T&Cs.
NewsUK has a brand partnership with Switchcraft.
"At 9am rush hour it's going to be steady, heavy rainfall for the far north of Scotland, down through western parts of the country and the south west.
"For north Wales and the north west of England we start off with some dampness. But the worst of the wet weather will be for Dumfries and Galloway, where there's a yellow warning in force due to the risk of localised flooding.
"Gales around some western coasts, in addition to the rainfall, but the worst conditions do tend to ease off through the morning.
"The rainfall spreads north and it turns drier and brighter for the whole of north west England, west Wales and sunshine breaking out for much of England and Wales then.
"We keep cloudy skies for Scotland and Northern Ireland and some bits and pieces of rainfall.
"But the southerly wind is going to be mild, particularly for north Wales and northern parts of Scotland - 16 perhaps 17C.
"Through Wednesday evening we continue to see that keen wind. Again, winds touching gale-force around the far north west and rainfall here as well."
Thursday will see another mild start, with some sunshine for eastern Scotland, northern England and parts of Wales.
But much of the country will see cloudier skies, especially England and Wales, as the day unfolds.
We pay for your stories! Do you have a story for The Sun Online news team? Email us at [email protected] or call 0207 782 4368 . You can WhatsApp us on 07810 791 502. We pay for videos too. Click here to upload yours.