Saturday 1 Jan - Monday 10 Jan
On Saturday, New Year's Day, rain is likely to move east and northeast across the UK, followed by showers. The wettest weather further north and west, with the southeast remaining drier. Strong winds are expected in the west, and it will continue to be very mild. Thereafter, the unsettled weather will continue to dominate, with Atlantic weather systems moving in from the west, interspersed with showery and brighter spells. The wettest areas are expected to be western hills, with the southeast remaining driest. It will also continue to be windy, with gales possible along western coasts. Temperatures likely mild or very mild at first, but returning closer to average into the new year. There is the chance of a brief settled spell towards the end of the period.
Tuesday 11 Jan - Tuesday 25 Jan
There is the potential for a short-lived settled spell to start this period, which would mean cooler and drier weather but also an increased risk of overnight fog and frost. Later in the month, milder but more unsettled weather is expected to return, with the associated hazards of strong winds and heavy rain.
https://www.metoffice.gov.uk/