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The mercury peaked at 35.2°C at the Maison St Louis observatory, making it the third-hottest day in Jersey since records began in 1894.
It was also the hottest July day, beating the previous record of 34.8°C set on 1 July 1952, but fell short of the all-time highest of 36°C on 9 August 2003.
As the temperatures soared, the Hospital saw an influx of patients, particularly elderly Islanders, suffering the effects of the heat. And access to the freezers at the Waitrose supermarket at Rue des Prés was restricted after they developed technical issues caused by the heat.
The mainly settled weather is expected to last for at least the next three or four days, although temperatures are expected to be lower, hovering in the low to mid-20s.
