Temperatures could reach their lowest so far this autumn, with a frosty night ahead, the Met Office has warned.
On Sunday night, temperatures equalled the lowest of the autumn so far, reaching minus 8.1C (17.4F) in Tulloch Bridge and Dalwhinnie in the Highlands.
Much of Glasgow woke up to -3C today, with similar temperatures expected later this evening.
In Northern Ireland the lowest temperature recorded was minus 5.1C (22.8F) in Katesbridge, County Down.
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The Met Office said Monday night would be cold and frosty for many areas and could be the coldest night across the UK as a whole.
Locally, temperatures could drop as low as minus 9C (15.8F) in rural Scotland and minus 7C (19.4F) in parts of England and Wales.
But a spokesman said the current cold spell may soon come to an end, with temperatures recovering throughout the week.
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People across the UK can expect sunshine on Monday and temperatures will rise across the board, reaching 5C (41F) to 6C (42.8F) in the north and peaking at 8C (46.4F) to 10C (50F) in the south.
Throughout the week, more cloud will push through in the south-west from the Atlantic, bringing an increasing chance of rain.
There is also a chance of showers along the North Sea coast and in the far east of Scotland.
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