The weather is expected to be milder than usual this year, particularly in parts of Scotland on Christmas Eve.
This would beat the record for the warmest minimum temperature north of the border – 10.6°C in Dounreay, Caithness – which was set in 1971.
Christmas Day is forecast around a maximum of 13 to 14°C.
The record high for Christmas Day was 15.6°C at Killerton, Devon, in 1920. In Scotland the highest ever temperature was 15.1°C in Dyce, Aberdeenshire, in 2011 and in Urquhart, Ross and Cromarty, in 2016.
He said: “The key notable factor of the weather through this week really is the mild conditions and higher temperatures.
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Read MoreHe added that Christmas Eve was expected to be the mildest day with 14°C and “potentially even up to 15°C in some places”.
Temperatures in Scotland and Northern Ireland were “markedly above average for the time of year”, he added.
He added that temperatures would “tail off slowly” towards the end of the week.
Last year was the hottest Christmas Eve in the UK since 1997 after temperatures of 15.3°C were recorded at Heathrow in west London and Cippenham in Slough.
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