Tuesday 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.
The temperature is the hottest recorded in the UK since 10 September last year, the weather agency said.
Winterbourne in Gloucestershire had 28.7C, Pershore in Worcestershire 28C, and Usk in Monmouthshire 27C.
It could get even hotter on Wednesday as temperatures are again expected to reach the high 20s.
A yellow alert from the UK Health Security Agency (UKHSA) is in place for most of England until 5pm on Thursday.
It warns 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.
Things are expected to cool a little just before the weekend, but it will remain warm.
The Met Office says the hot spell could also become a heatwave, which technically occurs when temperatures go above a set threshold for three days in a row.
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Music fans heading to Glastonbury this week are also set for a treat.
Festival gates open on Wednesday, when Worthy Farm is forecast to get 27C, and the weekend is shaping up to stay dry and warm.
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, according to the Met Office.
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