Weather maps expect Monday to see temperatures well into the low 20s – even the north-eastern Scottish city of Aberdeen will be around 20 degrees. However, there could be a big freeze as early as next weekend as temperatures will plummet to freezing lows, forecasters have claimed.
Using the latest global forecast models, experts have predicted icy conditions to blast the Scottish mountains by the end of September. Brian Gaze, forecaster for The Weather Outlook, tweeted: “Close to an ice day in the Scottish Highlands on Sunday 27 if GFS 00z is right.”
It comes as the latest charts show cold air forming over Scotland and north western areas.
This includes Liverpool and even parts of Wales, which has resulted in forecasters warning of icy conditions.
The north of the UK will cool on Tuesday. However, southern areas could get even warmer with London expected to experience temperatures of around 25 degrees.
A map showing winds across the north of the UK on Tuesday morning
Forecasters expect temperatures to plummet on Wednesday, however, with parts of Scotland even falling into single figures.
Meanwhile, flood alerts are currently in place for five areas in England including the Mersey Estuary in Warrington and the North Devon Coast from Hartland Point to Lynmouth following high tides.
There are also five flood alerts in Wales, particularly for south and south-west parts of the country.
London is due to reach temperatures of around 24 on Tuesday afternoon
There may even be a named storm – Storm Aiden – hitting the UK as a low pressure system approaches from the Atlantic on Wednesday.
It could bring rain and “brisk” winds according to Meteogroup forecaster Ravi Kotecha, and see London hit temperatures as low as 15 degrees from 25 on Tuesday.
Despite this, the Met Office’s Mr Petagna said the UK will “hold on to some fine weather” across Monday and Tuesday.
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Northern areas of Scotland may see some rain on Tuesday evening
However, he added things will turn “increasingly unsettled and cooler” as the week goes on.
Mr Petagna said: “Through this evening during the overnight period it’s dry. There’ll be some clear weather for a time but lots of low clouds and mist and fog forming during the early hours, becoming locally dense that fog, towards the morning in the south.
“So we get off to a slow start on Monday – lots of low clouds, some mist and fog to clear but once that burns back there’s be plenty of fine weather once again.
“Lots of sunshine to look forward to into the afternoon, but notice some wet and windy weather arriving across the far northwest later.
This map shows temperatures could even drop to freezing in the early hours this week
UK Highest temperatures graph
“Through Monday evening that cloud and rain in the far northwest will push a little bit further south-eastwards across other parts of Scotland, but for the bulk of the UK is stays dry and fairly clear too.
“As for the outlook – turning wet and windy and much cooler than of late across the UK.”
The Met Office adds there will be a band of rain which could bring occasionally heavy downpours across Scotland and Northern Ireland on Tuesday.
This could reach northwestern parts of England as well as the afternoon goes on.
From Wednesday to Friday, it adds the weather will be “much colder” than in the past week or so with longer spells of rain to be expected.
From Friday through to the start of October this trend can be expected to continue.
Thanks to last weekend’s heatwave, tourists decided to take advantage of the remaining summer weather.
Brighton is thought to have had around 50,000 daily visitors, while Bournemouth had around 25,000, according to the Mirror.