When surfer William Howells returned to the sea a year after suffering a heart attack, the swell was not the main thing on his mind. It was the smell. He said a wave of sewage releases in July left Harlyn Bay, Cornwall, just smelling of excrement.
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Generally the water quality is good in Cornwall. After periods of high rainfall, seawater can become contaminated with farmland or urban runoff. There is also the risk of sewage overflows releasing raw, untreated human waste into the ocean.
Average annual water temperature on the coast in Cornwall is 45°F, by the seasons: in winter 33°F, in spring 33°F, in summer 59°F, in autumn 53°F. Minimum water temperature (27°F) in Cornwall it happens in January, maximum (68°F) in August.