A "polar maritime air mass" is set to make Britain colder and windier next week with the potential for snow in parts of the country.
The harsh conditions are expected to last from Monday evening through to Tuesday afternoon.
Weather experts warned that there is a small chance of power cuts and cancellations to public transport.
Elsewhere in the country, next week looks set to begin wet.
Rain from the north will spread to the south east providing a drizzly commute for Londoners.
As the rain clears, temperatures will drop to lower figures by Wednesday and Thursday. Londoners can expect highs of 5C to 6C with temperatures falling as low as 1C or 2C during the night.
Outside of the city, in the south east temperatures could reach below zero on Wednesday and Thursday night.
A Met Office spokesman said: "A polar maritime air mass will feed in behind the rain on Monday, turning things colder and windy with frequent showers bringing some snow."
This weekend is set to be cloudy with temperatures peaking at 5C to 7C for London.