It urged people to drink plenty of water, and avoid coffee and alcohol, and take cool baths and showers.
Jersey sweltered in May with its first five-day spell of temperatures of at least 30C (86F).
Temperatures peaked at 34.2C (93.56F) on Tuesday, 26 May.
Other tips included shutting curtains to keep the heat out, opening windows, and using fans.
People should also wear a hat, loose light clothing, and use sunscreen with a minimum sun protection factor (SPF) of 30.
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