Temperatures are expected to plunge to arsenic debased arsenic -7C adjacent week aft a mild weekend.
Sunday could spot highs of 16C, though immoderate of the UK volition beryllium deed by bedewed and windy weather, according to the Met Office.
A somesthesia driblet into the commencement of adjacent week volition bring sub-zero conditions and frost overnight connected Monday, spokeswoman Becky Mitchell said.
Find retired the upwind successful your area
"Temperatures connected Monday could autumn arsenic debased arsenic astir -7C successful parts of agrarian Scotland overnight. That is apt to beryllium the coldest nighttime of the week," she said.
Ms Mitchell said mild upwind this play would bring highs of astir 15C successful southeast England, with apical temperatures of up to 16C successful the southwest connected Sunday.
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"It volition beryllium rather bedewed and windy though, we volition person assorted bands of rainfall coming successful from the west, which could beryllium dense astatine times, and besides precise breezy crossed the full country," she said.
"The rainfall volition beryllium dense successful places, but we're not expecting immoderate ample amounts to origin immoderate important issues."
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The colder upwind volition commencement connected Monday, with temperatures expected to beryllium somewhat beneath average, and showery outbreaks of rainfall and northerly wind.
Tuesday is predicted to spot a set of rainfall gradually moving successful from the west.
"The temperatures this full clip volition beryllium astir mid-single figures, truthful feeling beauteous chilly. We volition person immoderate overnight frost arsenic well, peculiarly connected Monday night," said Ms Mitchell.
"Thereafter temperatures are astir apt turning mean from midweek, with rainfall astatine times and immoderate adust interludes too."