A south to south-easterly breeze will push in much warmer air from the European continent.
Temperatures will be around 6 to 10C above average for early April.
Today’s temperatures will be higher than Easter Monday, rising to the high teens and low twenties in most parts.
Across the south Midlands and the west coast of Wales it is likely to reach 22C (72F), making it the warmest day of the year so far.
The previous highest temperature this year was 20.9C (69.6F), recorded on 31 March at Pershore, Worcestershire.
Today will be a sunny day across across England, Wales and much of Scotland. Cloud will arrive in Northern Ireland and the far west of Scotland later with the risk of a shower.
Any showers in Scotland overnight will die out tomorrow morning and the cloud in Scotland and Northern Ireland will break up on Wednesday afternoon.
England and Wales will remain sunny but with lighter winds and it may feel more like a typical summer’s day for many.
The focus of the highest temperatures on Wednesday will be the Midlands, East Anglia and south-east England, where temperatures could reach 25C (77F).
