Temperatures will plummet from the start of October as Atlantic storm-driven gales and torrential downpours smash the country, according to some forecasters. The first taste of winter will arrive this weekend with northerly winds possibly bringing the first flurry of snow across the Scottish mountains. Thermometers will nosedive overnight nudging freezing in parts while daytime highs hover widely between 10C (50F) and 17C (62.6F).
However the first big freeze could happen as early as next month with winter set to roar in after the end of September.
Exacta Weather forecaster James Madden said: “The current weather conditions are going to be replaced by something much cooler and more unsettled bringing a pattern which is likely to persist through much of October.
“These colder conditions are likely to be accompanied by some rather notable stormy periods.
“These will develop initially off the east coast of the United States between the end of this month and November, but are shaping up to be particularly troublesome through October.
“There are expected to be at least two or three particularly disruptive storms during this period bringing excessive rainfall and strong winds.”
Wintery conditions could grip the nation well before the official start of the season meaning a bitterly cold winter is on the cards, he warned.
“Odds are favourable for some early shots of colder weather to develop through the second half of the meteorological autumn,” he said.
“This will come as a shock to the system especially the trend over the past couple of years has been for milder autumn and early winter conditions.”
Britain will start to cool down through the coming days with Atlantic low-pressure set to bring outbreaks of wind and rain.
Thermometers will begin to rise over the weekend but only to around average for the time of year, according to The Weather Company’s Eleanor Bell.
She said: “We expect a mixed period ahead as low pressure systems pass to the north bringing rain and blustery conditions.
“It will feel cool with temperatures below normal for the time of year.
“Temperatures are expected to rise back towards normal/slightly above for the time of year next week in a southwesterly flow.
“Volatility in the forecast is expected through the remainder of September with further tropical activity expected in the Atlantic.”
The change in weather has prompted bookies to slash the odds on winter entering the record books as the coldest ever.
Coral is offering 2-1 on an unprecedented seasonal freeze as punters start to hedge their bets on festive snow.
Coral spokesman Harry Aitkenhead said: “2019 has been a mixed year weather wise to say the least and we think we could be headed for a bleak winter.
“We make it 2-1 to be the coldest ever and we look certain to have a freezing festive period to look forward to.”
Temperatures will fall through the weekend with parts of northern Britain braced for frosts as weather models show the slight chance of Scottish mountain snow.
It will follow a rainy end to the week with showers set to give much of the country a drenching on Friday, according to the Met Office.
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Spokesman Oli Claydon said: “Rain will move across much of the UK on Saturday and it will be fairly blustery as this band moves southeastwards.
“Overnight into the weekend clear skies will mean that temperatures will fall and it will be chilly with the chance of grass frost and even an air frost.
“We will start to notice high pressure building on Saturday bringing more settled conditions although there will be a few scattered showers to the north of the country.
“There will be more rain overnight on Sunday and into the start of the new week.”
Britain’s unsettled weather theme is likely to continue past the end of September with October shaping up to be colder than usual, according to the Met Office.
Its long-range outlook states: “It will probably stay changeable as we go through the rest of September and head into the start of October, still with some wind and rain at times, but with some drier interludes too.
“As is typical for this time of year, the driest and brightest weather is most likely in the south, whilst the north or northwest will generally be more unsettled.
“Temperatures will most likely remain near to below average, with the coldest conditions across the north.”
The Met Office said snow over high ground of Scotland this weekend was ‘not out of the question’.