Plummeting temperatures could see rain turn into snow as some parts of the UK prepare for a wet start to the week.
Yellow weather warnings for heavy rain and strong winds have been issued for eastern, south-eastern and central England.
The Met Office warned that the weather could cause flooding, power cuts and damage to trees and other structures.
Its website says: “Strong winds are also likely with gusts of 40-45 mph likely inland, particularly during Monday morning, and possible gusts to 50-55 mph along exposed coasts and over hills.
“Coming from an unusual (northerly) direction may increase the likelihood of wind-related impacts.
“Note that these winds will also lead to large waves, and spray and overtopping around some coasts.
“It may also be cold enough for a little sleet or wet snow on high ground but this is unlikely to settle.”
Heavy rain is expected to affect south-eastern parts of England on Monday, with the worst forecast for the morning.
With up to 60-80mm of rain possible, some places could see flooding and experts are warning of difficult driving conditions, potential road closures, and delays or cancellations to train and bus services.
Temperatures could drop as low as 2C (35.6F) on Sunday night with highs of around 8C (46.4F) forecast for the South East on Monday.
Clare Dinnis, flood duty manager for the Environment Agency, said: “Widespread heavy rain from Sunday evening and through Monday could lead to flooding from surface water and rivers in parts of south, south-east and central England.
“Strong winds will also lead to large waves and spray in exposed coastal areas and we encourage people to take care in these locations.
“We expect some travel disruption during Monday morning’s rush-hour. We advise people to listen to their local radio stations and remember not to drive through flood water as just 30cm of fast flowing water is enough to move your car.”