Wales should expect a mostly wet and mild Christmas with a small possibility of light hill snow on high ground.
The normal average temperature for the end of December is 7C.
Wales will experience mild weather on Christmas Day, with a little rain expected and a very small possibility of light hill snow.
Any significant snowfall on Christmas Day will come on higher ground in northern England such as the Pennines, or Scotland.
The Met Office said specific locations for snow are still unclear as the boundary between where cold and milder air will be - and therefore which areas might see snow - is still uncertain.
A Met Office spokesperson said: "What's happening now is we've got some warmer air coming in from the south-west, but we've still got this cold pool of air over the north and over Scotland.
"Because the high pressure has moved out of the way, it allows these systems to move in from the south-west so we are going to see bands of weather fronts bringing some rain.
"For much of the country it looks like Christmas Day will see some rain showers, and some heavier bursts mixed in, but overall a mild showery day."
These mild temperatures mean there is little risk of frost and ice across most of the UK, and any rainfall will be short-lived and unlikely to cause any disruption.
There is a risk of fog across southern parts of England and Wales on Christmas Eve which could affect travel, but this will be clear by Christmas Day.