The February average is 8.2C, compared to 9.8C so far this year.
The highest temperature recorded for the month was 19.7C in Greenwich, east London, in 1998.
Ms Roberts added: “It will vary day to day but generally speaking the south east corner of the country will tend to see the best of the sunshine.
“There’s some rain and showers in the forecast. We have got showers for various parts of the country tomorrow, the North West particularly, but also some showers in the South East.”
Monday morning will be mostly cloudy with a chance of some sunny spells in the North East in the afternoon.
Tuesday could be much brighter for eastern parts of the country, the Met Office predicts.
The unseasonably mild weather saw the warmest Valentine’s Day in more than 20 years on Thursday with a maximum of 16.1C recorded in the Welsh town of Bala, Gwynedd.