Temperatures could be higher than expected today, hitting 25C in parts of Britain as the "remarkably" warm and dry April continues.
But despite forecasters predicting "clear blue skies" for Thursday and Friday, the country will be unable to make the most of the sunny weather as the coronavirus lockdown continues.
BBC meteorologist Darren Bett said with winds light it will feel warmer and temperatures could peak at 25C in central southern areas - but "widely 19 or 20C for England and Wales".
Mr Bett said pollen levels will, however, be high again today.
"It's tree pollen season, of course, and the big culprit is the oak tree - and high levels again on Friday," he said.
He said temperatures will start at around 1C in Aberdeen and "4 or 5C" for much of the rest of the UK with the chance of a "touch of frost" before quickly climbing.
According to the Met Office, Wednesday's highest temperature of 22.6C was recorded at Bournemouth, while 20C conditions were observed in other parts of England and South Wales.
Meteorologist Luke Miall said Thursday will see "pretty much clear blue skies across the whole country".
He said some high level cloud would turn the sunshine hazy in the afternoon, but lighter winds would mean warmer conditions.
On Friday, the good weather is largely set to continue, with the exception of a little more cloud first thing in the morning in eastern areas.
Mr Miall said temperatures recorded so far in April were averaging 2.5C above normal for the month.
He said there had been "barely any rainfall" in some areas since the start of the month, which meant it was on track to be one of the driest Aprils.
Although a chance of rain on Thursday next week could affect that possibility, Mr Miall said.
Summing up the month he added: "April's been remarkably warm and remarkably dry so far."
Bookmaker Ladbrokes has cut odds to 4/5 on this week beating the hottest day of the year so far when 26C was recorded in Treknow, Cornwall, on April 10.
The Met Office's Simon Partridge told the Mirror Online earlier this week the lowest averages for the month are currently sitting at 2.4C above the 11.5C average for April.
The hottest ever April day was April 16, 1949 which saw parts of Britain reach 29.4C.
As of this week the UK has already seen 81 per cent of its average amount of sunshine for the month and only 17 per cent of rainfall.
UK 5 day weather forecast
Today:
Another fine, dry and bright day with plenty of sunshine. Winds will be mostly light, though sea breezes will affect some coastal areas. Feeling warm.
Tonight:
Dry with largely clear skies for most. Cloud is likely to develop in some North Sea coastal areas from East Anglia northwards and then spread inland during the early hours.
Friday:
Fine, dry and bright with plenty of warm sunshine for most. Early low cloud over parts of eastern and central UK will soon retreat back to North Sea coasts.
Outlook for Saturday to Monday:
Many places dry and warm with sunny spells on Saturday. Turning less settled and cooler from the north on through Sunday and Monday with some showers developing.
