With bookies slashing odds on snow to fall in the UK this month, the Met Office said that the Scottish Highlands, Lake District, are North Pennines are most at risk.
After the UK bathed in sunshine last week, with temperatures hitting a record breaking 29C (84.2F) in central London and 20C north of the border, the hot spell will turn to cold weather and winter flurries are predicted for higher ground.
Areas on higher ground could experience temperatures below freezing.
“Towards the end of the week it is certainly possible that the cold weather will include hail, sleet showers and snow, especially on higher ground,” said Met Office meteorologist John West.
“The areas most at risk are the Lake District, North Pennines and Scottish Highlands, but we are not expecting a big impact.”
He said May will start with unsettled weather, although it should not be a particularly wet month.