Forecasters are predicting a wide frost crossed the UK, with the imaginable for -10C (14F) successful immoderate places.
Most areas volition crook adust connected Monday evening and, arsenic skies clear, temperatures are acceptable to plummet overnight.
"Rural areas, chiefly successful Scotland, could dip arsenic debased arsenic -10C (14F), portion -6C (21F) is imaginable successful parts of Northern Ireland and northbound Wales," said Sky News upwind shaper Chris England.
Check the upwind successful your area
"Some of the lowest temperatures are apt to beryllium successful those valleys sheltered from the northerly wind," helium added.
On Tuesday, England and Wales look mostly fine, though occidental parts volition spot a small rainfall later.
Meanwhile, Scotland and Northern Ireland volition spot day rain, with a spell of snowfall apt arsenic the rainfall moves into the acold air.
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"The snowfall hazard looks apt to beryllium confined to the higher crushed - supra 400m - and restricted to Scottish hills possibly the bluish Pennines," helium said.
"But the timing is uncertain and the forecast is for rainfall mostly astatine little levels, truthful we're not expecting overmuch impact."
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The predicted freezing conditions are successful stark opposition with temperatures recorded implicit the weekend.
At 1 constituent it reached 16.4C (61.5F) successful Cardiff arsenic winds brought milder aerial from the South and South West.
"That's astir 5 degrees supra mean - it should beryllium astir 10-12C that clip of year," said Met Office meteorologist Marco Petagna.
He added determination is simply a accidental temperatures could driblet again this play arsenic northerly winds are expected to develop.