Sunday 2 Jan - Tuesday 11 Jan
A corridor of thicker cloud and rain likely moving northeastwards on Sunday, remaining mild to the southeast of this, but temperatures returning close to normal to its west. As the cloud and rain clear, northwesterly winds are likely to develop early in the following week. These winds will be strong at times, likely bring showers, and these showers will likely become wintry for at least a short time across the far north. However, moving beyond the midweek period changeable conditions with westerly winds are likely to spread across the UK. Spells of rain will be accompanied by milder conditions, these will likely be interspersed with showers and nearer average temperatures. During this time the most unsettled conditions will most likely be towards the northwest, and most settled towards the southeast.
Wednesday 12 Jan - Wednesday 26 Jan
Unsettled conditions are most likely through much of the period with spells of rain interspersed with drier but still showery interludes. Strong winds likely at times. Early in this period there is a chance of a spell of cold weather bringing a greater chance of snow particularly to northern regions. However, near or above average temperatures are the most likely outcomes. Through the end of the period there is a greater chance of some more settled spells developing, particularly across the S. This would increase the incidence of overnight frost and fog.
https://www.metoffice.gov.uk/