Even areas further north including Hull and Newcastle are expected to reach the mid to high 20s as the weekend progresses, with temperatures building day-on-day, according to the Met Office.
The sunshine is due to last until so-called ‘Freedom Day’ on Monday, the day when the last of the Covid-19 restrictions are due to be lifted.
The hottest day of the year so far was 29.7C recorded at Teddington in south-west London on June 14.
But we are still a long way away from record temperatures for this time of year . A scorching 38.7C was recorded at Cambridge Botanical Gardens on July 25 2019.
Met Office meteorologist Simon Partridge said the weather may take people by surprise ‘because so far this summer has not been that great’.
‘Temperatures have generally been below average for quite a while – it’s the difference in temperature in such a short space of time that is the most noticeable,’ he said.
‘But it will affect most of the UK and that is a little bit more unusual – Scotland and Northern Ireland just got their warmest day of the year.
‘Northern Ireland might get closer to its highest-ever temperature, which to be fair is only just above 30C.’
The weather is expected to turn cooler and thundery from the middle of next week.
With Brits expected to make the most of the three days of sun, officials are warning about the dangers of extreme heat.
Public Health England advised people to look out for those who may struggle to keep cool and hydrated, such as older people and those who live alone.
Emergency animal care provider Vets Now also warned rising temperatures could increase the risk of heat stroke in dogs.
The vet service sees a spike in callouts as the weather warms up and has warned that temperatures above 20C put dogs at risk, and that survival rates for dogs with heat stroke is just 50%.
The warnings come after a week of flash flooding in the south east of England, causing disruption to transport in London.
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