The Met Office has extended the extreme heat amber weather warning across Suffolk.
The alert remains in place until 9pm on Saturday, June 27.
The Met office has warned of adverse health effects, the potential for power cuts, and travel disruption as temperatures soar to dangerous levels.
A red heat-health alert has also been issued by the UK Health Security Agency – only the second of its kind for Suffolk – signalling an increased risk to life across the population.
Severe impacts are expected on health and social care services, with the Met Office warning that vulnerable individuals are likely to experience "adverse health effects."
There are also risks of sunburn, heat exhaustion, and other heat-related illnesses.
The warning adds that "an increased chance that some heat-sensitive systems and equipment may fail, leading to power cuts and the loss of other services to some homes and businesses" is likely.
There is also a higher risk of water safety incidents as more people are expected to visit coastal areas, lakes, and rivers.
Delays to road, rail, and air travel are possible and could result in welfare concerns for those stuck in prolonged disruption.
Temperatures are forecast to reach 38C or 39C in inland areas such as Ipswich, Bury St Edmunds, Sudbury and Stowmarket on Friday.
Coastal towns like Lowestoft, Felixstowe, and Southwold are expected to hit 35C to 36C on Friday.
Public health officials are urging residents to take precautions, including staying hydrated, avoiding the sun during peak hours (11am–3pm), and closing curtains in sun-facing rooms.
People are advised to stay in the shade, wear sunscreen, and use wide-brimmed hats if heading outside.
This comes as Cedarwood Primary School in Kesgrave closed due to the extreme heat, and other schools in Suffolk, including Thomas Gainsborough School and Ormiston Sudbury Academy, have relaxed uniform rules.
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