New Year's Eve could be the mildest on record with temperatures as high as 15C, the Met Office has said.
The previous New Year's Eve record of 14.8C (58.64F) was set in 2011.
However, this year could see that level matched, or even surpassed in some parts of the UK.
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Met Office Meteorologist Greg Dewhurst said: "The record is 14.8C on New Year's Eve and that was in 2011, temperatures look like they'll be 14 to 15C (57.2-59F) so it is possible that temperatures could be that value."
Mr Dewhurst said the weather throughout the week will be "on the mild side", adding: "We're going to see across the whole of the country, through the rest of this week, temperatures that are above average for this time of year.
"The average temperature in the UK around this time of year should be around 7-8C (44.6-46.4F).
"Going forward, we're looking at highs of around 12-14C (53.6-57.2F), possibly locally 15C in one or two spots, so it's going to be well above average."
It comes after parts of the UK had a white Christmas, with snowfall in Yorkshire and Scotland.
However, Mr Dewhurst warned that Britons will not be basking in unseasonable sun.
He continued: "It isn't going to be blue skies all week.
"There's going to be cloud at times as well as strong winds and heavy rain, particularly across the North and the West of the UK.
"This is all being driven by low pressure systems moving across the Atlantic and bringing in the milder air and wet weather."
He added that there were no weather warnings in place, but parts of the UK will be hit by gale force winds later in the week.
Liverpool is set for highs of 12C on New Year's Eve, with lows of 10C.
The predicted weather is described as "partly cloudy changing to sunny intervals by late morning".
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