What temperature is warm enough to swim in a lake?
What temperature is warm enough to swim in a lake? No matter where you're swimming, avoiding water below 70 degrees Fahrenheit is a good rule of thumb for the average swimmer. The truth of the matter, though, is that 70 degrees is still pretty chilly. You'll probably have a better time if you wait for warmer water. In fact, you'll be safer, too.
Is 24 degrees too cold for swimming?
Thirty degrees and above is considered too warm for comfortable swimming by virtually all swimmers. Triathletes use a standard measurement of 24 degrees Celsius / 75 degrees Fahrenheit as the temperature up to which they are allowed to wear wet-suits. By that standard, 24 degrees is the upper limit of cold water.