A chilly, bright start to the day will be replaced with rain later today across London, forecasters predict.
The capital was at a brisk 6c at its coldest today, although it could go as high as 9C.
It comes amid mixed weather across the UK, with a bone-rattling -5.9 recorded overnight in parts of Scotland.
However milder temperatures are on the way, say forecasters.
Alex Burkill, a forecaster at the Met Office, said: "It's going to be much milder than it has been of late for many parts."
Figures could hit double figures in the South West.
London could see temperatures of 10C on Wednesday.
Cold weather - in pictures
Mr Burkill said many places tonight, going in to Monday, would stay above freezing.
He said for the next week or so there would be periods where it will be sunny with clear skies but therefore colder, and periods where the weather would be more unsettled but milder as a result.
"That's why we're going to see a flipflopping in temperatures," he said.
