In a post on X, Cornwall Council said its waste and recycling collections would begin earlier on 23 and 24 June due to the temperatures.
It urged people to put recycling, food waste, rubbish, garden containers and clinical waste out by 06:00 BST.
Woolacombe Surf Life Saving Club coach, Luxy Allix, urged people to avoid staying in the cold water for too long.
“Unfortunately, we had those deaths recently in the last heatwave due to water shock. People do need to be really aware of that,” Allix said.
“Don’t push yourself, don’t go in too long and get really cold,” she said. “Come out, warm up and then go back in.”
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