More than 15 beaches in the South West have failed tests for bathing water quality. They include a number of previously recommended beaches such as Bude in Cornwall, Exmouth in Devon and Charmouth in Dorset.
The Marine Conservation Society says one of the wettest summers on record has led to increased sewage in the sea.
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Charles Howeson has been sentenced to seven years and six months for historic sexual offences against eight young men between 1985 - 1994.
The heatwave will culminate next Wednesday, which forecasters say could be the hottest day of 2018.
The Prince of Wales and Duchess of Cornwall visited the city in an attempt to encourage tourists to visit.