Today has been the hottest day of the year so far in the UK, the Met Office has said.
A high of 30C (86F) was recorded in Chertsey, Surrey.
It is the highest temperature in the UK since 10 September last year, the weather agency said.
Winterbourne in Gloucestershire recorded a high of 28.7C, while it was 28C in Pershore, Worcestershire, and 27C in Usk, Monmouthshire.
It could get even hotter on Wednesday – some areas could experience highs of 31C (87.8F), the Met Office added.
A yellow alert from the UK Health Security Agency (UKHSA) is in place for most of England until 5pm on Thursday.
It has warned there could be “significant impacts” in the health and social care sector, and an increase in mortality in over-65s and people with health conditions.
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Conditions are expected to cool a little just before the weekend, but it will remain warm.
The Met Office said the hot spell could become a heatwave, which occurs when temperatures go above a set threshold – which varies between regions – for three days in a row.
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Music fans heading to Glastonbury are also set for a treat.
Festival gates open on Wednesday, when temperatures at Worthy Farm are forecast to reach 27C – and the weekend is shaping up to stay largely fine too.
However, there is a chance of a bit of rain on Saturday.
The hot spell marks a break from the rainy spring, which saw 32% more rain than average in England and Wales, making it the fifth wettest for England and the eighth wettest for Wales, said the Met Office.
