Temperatures will also soar in the capital reaching highs of 25C according to the Met Office. The north will also be warm with Scotland experiencing temperatures of around 16 to 17 degrees and the north of England sitting at around 20.
For the midlands and the south, clearer skies will continue and so will the high temperatures, the Met Office adds.
Presenter Aidan McGivern said: “Further south we keep the sunshine and the warmth for one more day, before it turns more widely unsettled.”
The mercury will reportedly hit as high as 25 degrees Celsius in London towards the late afternoon, though temperatures will be significantly cooler in the south-western coast – it will be around 18 degrees in Plymouth this afternoon.
Mr McGivern added: “Another sunny day to come for the Midlands, East Anglia, southern England, and much of Wales.
“And warmth – 22 to 25 degrees Celcius, many areas seeing a degree or so higher compared to Tuesday afternoon.”
Cloud cover and heavier rain will begin to move in from the west overnight along with low pressure, marking an end the to the relatively balmy summer heat of last weekend.
Netweather reports a cold front is due across the southeast as well, thanks to low pressure passing over northern Scotland and pulling this cold weather through.
As a result, Thursday and Friday will see a “swathe” of cloud and rain over parts of England and Wales along with higher winds.
According to predictions, this will bring wed and windy conditions across all parts of the UK on Saturday, while a cool and brisk wind will be felt on Sunday.
Despite the falling temperatures towards the weekend, the pollen count will remain high across nearly all of England until at least Friday.
The Met Office states only Scotland will see low counts this week, with the south of England experiencing high counts which spread northwards as the week goes on.
This high count will fall to medium across nearly all of the UK including southern Scotland by the weekend.
Northern Ireland will see a high pollen count on Thursday before returning to a medium count on Friday.