The freak April freeze will continue again today with widespread frost and temperatures plunging as low as -7C.
Forecasters have said that an Arctic chill that arrived last week is still lingering with the mercury expected to barely rise above single digits on Wednesday.
Rain will also batter parts of the UK with Wales and the south bearing the brunt of the deluge.
Met Office forecaster Aidan McGivern said that most will be waking up to another bitingly cold day today with fog possible, but with sunshine arriving later on.
He said: “A widespread frost and some fog patches to wake up to on Wednesday.
“They will give way to sunny spells and there will be fewer showers compared to the last few days.
“We have still got the cold air in place across the UK that was brought down from the Arctic at the end of last week, it’s now lingering.”
Forecasters expect temperatures to sink to minus 4 for some parts of Wales and Northern Ireland and reaching as low as minus 7 in some parts of Scotland.
By the late afternoon temperatures will peak just above single figures in some areas and the UK will turn relatively warmer, with highs of about 13 C in southern England.
There will also be scattered showers throughout the day in many parts of the country, which will turn into sunnier weather as the day goes on.
Most of the rainfall that is expected to hit will batter Wales and parts of the south coast and south west England.
Flooding remains a possibility in some regions and the Environment Agency has issued five flood alerts for the country.
Looking ahead forecasters went on to warn of yet another freezing cold start for Thursday as the April freeze continues this week.
UK Weather Forecast
A few showers, mainly in the southwest, but dry for the vast majority with good sunny spells. Temperatures still below average for many but feeling warm in sunshine and light winds away from the east England coast.
Another chilly night, particularly in the east with a fairly widespread frost again, but dry. The odd fog patch possible in the west.
Fine with good sunshine for most though a few showers feeding into east England through the day, perhaps reaching central parts. Cool in the breezier east.