Overnight frost is due to strike in Britain as temperatures plummet to 5C and more heavy rain sweeps in.
The October cold snap is set to continue across the UK, with little in the way of sun on Monday as persistent rain and chilly temperatures dominate.
Met Office forecaster Luke Miall said today will be “quite grey, quite grotty” in a major U-turn from the milder conditions of Sunday.
He said as the day progresses, “cloud will continue to invade its way eastwards and that rain pushes its way in, bringing some heavy rain at times”.
Temperature charts show much of the country struggling to remain in double figures, with the south coast the coldest this morning.
Meteorologist Sarah Keith-Lucas said the week will start “quite unsettled – quite cool and breezy, especially over the next couple of days”.
And while things are expected to settle and become drier in the days to come, showers could “linger” in the south, she continued.
Ms Keith-Lucas said on Monday there will be “some rain from the word ‘go'” across Scotland and Northern Ireland.
A big band of rain will edge its way eastwards across England and Wales, bringing patchy showers, with temperatures averaging around 10 or 11 degrees.
The area of low pressure responsible for holding the rain in place on Monday will move further towards the south east before sitting in the near continent for much of the week “throwing showers in”.
The forecaster described the days to come as “cool, showery, breezy weather persisting”.
The Environment Agency has issued three flood alerts for England on Monday around Bournemouth and the south Midands.
But through the middle of the week many could see some drier and brighter conditions by day, with sunshine, continued Ms Keith-Lucas.
“With those clear skies, overnight that means a return to some frosts – more particularly across the northern half of the UK could be a bit frosty.
“Perhaps some mist and fog overnight as well,” she added.
It comes after temperatures were expected to dip to 1C in parts of Scotland over the weekend, with some snow settling on hills in the far north.
Some forecasters say temperatures as low as -10 could be on the cards next month in an early winter.
UK 5 day weather forecast
Rain slowly moving eastwards bringing a damp, and chilly day for many though eastern England starting dry. Brightening up for western parts with some sunshine but also showers to end the day.
Heavy showers along the western side, perhaps dying out in the northwest later. Eastern areas staying mostly cloudy and damp with the chance of heavier rain. Chilly and murky between.
Eastern and central parts staying cloudy and damp with some rain but brightening up in the north and west. Still some showers here, particularly in the southwest. Staying cold.
Outlook for Wednesday to Friday:
Showers mainly across eastern areas on Wednesday, some heavy and it will be breezy. Thursday and Friday largely dry with sunny intervals. Becoming less windy but still rather cold.