70° to 78° Fahrenheit is the range where most folks feel comfortable swimming.
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The Canadian-based group considers cold temperatures to be under 10°C, while cool is 10°C to 20°C, warm or hot is 21°C to 39°C and anything above 40°C is considered scalding. It's safe to say you don't want to swim in waters less than 10°C or anything exceeding 40°C. “Most water in Canada is cold, said Beyers.