BBC Weather’s Matt Taylor warned a huge band of persistent rain will spark thunderstorms across Wales and stop at the border of Scotland. Gale force winds will also strengthen across southwest England to up to 50mph. On Friday, temperatures in Scotland will plunge to at least 1C.
Mr Taylor said: “You will see a few rainbows across the country, a bit of thick cloud, a bit of rain and even the odd rumble of thunder.
“It’s a sun and showers day for the vast majority but also towards the southwest of the UK we’re going to see winds pick up a bit later.
“The skies will change every so often, some sunshine and showers with rumbles of thunder across Wales this morning.
“A persistent zone of thick cloud is pushing its way to East Anglia and northern England during rush hour.
“Winds will strengthen to around 40 to 50mph in southwest England but showers will be most frequent close to coastal counties.
“This evening and overnight the rain will push its way southwards with England and Wales most likely to see rain at times.
“In between those when skies clear it will be another rather cool night. Temperatures across parts of Scotland could drop below freezing.
“Tomorrow, it’s going to be a blustery day wherever you are.”
Britons had been making the most of the balmy weather – which saw temperatures hit 25.4C in Yeovilton, Somerset, on Monday, but they are set to see temperatures plunge by up to 10C in the next few days.
Met Office operational meteorologist Martin Bowles said: “We are saying there could be a 10C change in the maximum temperature.
“We have had this period of rather summery weather over the last few days – that is going to change on Tuesday and Wednesday, quite significantly.”
It comes as warm air from southern Europe is replaced by cold air from the north Atlantic which should see temperatures drop today.
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Mr Bowles said: “It is when the astronomical autumn begins so it is quite appropriate we are getting quite a significant change in weather.”
He added: “You would expect a gradual change as we move later in the year, it just happens that as we have got these low pressure systems coming in tomorrow that it coincides with the autumnal equinox.”
In a forecast covering Wednesday to Friday, the Met Office said: “Turning much colder than recently and unsettled with showers and occasional longer spells of rain.
“Some drier, brighter interludes are also likely, especially in the west on Friday.”
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