This New Year’s night could be the mildest on record with temperatures as high as 15C, the Met Office said.
The prediction comes after parts of the UK had a white Christmas, with snowfall in Yorkshire and Scotland.
Empty pressure systems moving across the Atlantic Ocean carried the change, bringing in milder air and wet weather, the Met Office said.
Forecasters had said that the previous New Year’s record of 14.8C (58.6F) in 2011 was similar or even surpassed in parts of the UK.
Met Office meteorologist Greg Dewhurst said: “The record is 14.8C on New Year’s Eve and that was in 2011, temperatures seem to be 14C to 15C (57.2F-59F), so it’s possible that temperatures could be that value,” he said.
Dewhurst said the weather will be “on the mild side” all week.
“We’ll be seeing temperatures all over the country, through the rest of this week, above average for this time of year,” Dewhurst said.
“The average temperature in the UK around this time of year should be around 7C-8C (44.6F-46.4F).
“In advance, we are going to altitudes of about 12C-14C (53.6-57.2F), possibly locally 15C in one or two places, so it will be well above average.”
“It’s not going to be blue skies all week,” Dewhurst added. “There will be occasional clouds, such as strong winds and heavy rain, especially in the north and west of the United Kingdom.”
He said there were no weather warnings at the site but parts of the UK would be hit by storm strength later in the week.
“Gales are possible at times in the south and west as we move through the week,” he said.