A yellow heat health alert has been extended for Norfolk as temperatures are set to reach 30C.
The weather alert warns of "significant impact" across the health and social care sector due to the high temperatures.
The alert, issued by the UK Health Security Agency and Met Office, will now last until Friday.
This afternoon Diss, Thetford and Norwich are all set to reach a blistering 30C at around 2pm - three degrees hotter than Lisbon in Portugal at the same time.
In west Norfolk places such as Downham Market and King's Lynn will see highs of 28C.
READ MORE: Where will be the hottest place in Norfolk this week as temperatures hit 30C?
The cooling sea breeze will keep north Norfolk notably cooler, with Cromer and Wells reaching highs of 25C.
Punters making a trip to the east coast will enjoy temperatures of around 26C with Great Yarmouth and Gorleston peaking at 3pm today.
A yellow heat warning has been issued for the East of England (Image: UKHSA)
A spokesman for the UKHSA said there should be a focus on those "particularly in the 65+ age group or those with health conditions, but impacts may also be seen in younger age groups".
An increased demand for remote healthcare services is likely with temperatures in care settings, including hospitals and care homes, possibly exceeding the "recommended threshold".
The Met Office has also issued a yellow weather warning for thunderstorms which is in place across Norfolk on Thursday from midday.
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