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It's time to dig out the winter duvet, hunt for your thermals and think about putting the central heating back on.

For after a pleasant week, forecasters say the weather will take a chilly turn for the worse this weekend.

Millions are expected to wake up to a frost this morning, while the Scottish highlands could see a dusting of September snow.

Although the cold snap won't last, the first frost of the autumn for many is an unwelcome sign that winter is just around the corner.

The mercury fell to 3c (37f) last night for much of the UK, with forecasters saying there was a 'slight chance' temperatures could sink to minus 2c (28f) in Aberdeen. 'It's pretty cold at the moment, particularly at night,' said the Met Office's spokesman Barry Grommet.

'Generally we are looking at temperatures of 3c and 4c at the lowest and people who are out and about early in sheltered rural areas may see some ground frost.'

'On Saturday morning, there's a tiny chance that Aberdeen could be as cold as minus 2c,' Mr Grommet added. 'And there could be a very light dusting of snow over the mountain tops in Scotland.'

The cold snap last night and tonight comes before the official end of summer - the September 23 autumn equinox - and the frosts will be an expensive headache for farmers harvesting spring barley across the country.