Altnaharra, in Sutherland, the most northern region of the Highlands, had reached the low by 9pm on Friday

The UK has recorded its chilliest January night of -17.3C in 15 years, as forecasters predicted it could get even colder over the weekend with temperatures falling as low as -20C in some locations.

Altnaharra, in Sutherland, the most northern region of the Highlands, reached the low by 9pm on Friday. It is the coldest January overnight temperature since 2010, when it dropped below minus 15C several times at locations across the UK, including minus 22.3C on 8 January in Altnaharra.