Highs of up to 17C (62.6F) are predicted for Norfolk and Cambridgeshire on Wednesday, with the mercury rising to around 15C (59F) or 16C (60.8F) across parts of South East and central England.
While much of Scotland, Northern Ireland and part of North Wales have been braced to expect heavy rain, the rest of the UK has been told to expect mild and often dry conditions.
Met Office spokesman Oli Claydon said: “A few days of milder temperatures are forecast.
“Through the week we’re into double figures (in Celsius) for many places, including parts of Scotland.
“It will be a noticeable change from what we’ve had in recent weeks.”
Wednesday’s predicted highs are well above the UK average maximum temperature for February, which stands at 6.6C (43.9F).
In fact, 17C (62.6F) will eclipse the average maximum temperature for May, which is 14.8C (58.6F) for the UK, and 15.8C (60.4F) for England.
The rain is forecast to move down across the UK from Wednesday into Thursday, but is likely to clear by Friday.
More sunshine is predicted for the end of the working week, with sunshine and mild temperatures again reaching up to 15C (59F) across the UK.
Mr Claydon said: “It will feel more like spring, especially in the sunshine.”
Here is the full Met Office weather forecast for the North West:
This evening and tonight (February 23):
A wet and windy evening with rain, heaviest in the north, continuing into the night. Rain will turn more showery in the south with winds easing by dawn. Feeling mild. Minimum temperature 10C.
Wednesday (February 24):
Another unsettled day with outbreaks of rain continuing throughout much of the day and easing overnight. Less breezy than of late and staying mild. Maximum temperature 14 °C.
Outlook for Thursday to Saturday (February 25 - February 27):
Turning increasingly settled with plenty of sunshine and lighter winds throughout the period. Largely dry with the odd light shower possible. Some early fog and feeling mild.