While it's not illegal to swim in Moraine Lake — nobody is going to stop you — as you now know, the lake is glacially fed, making the water incredibly cold; it's only about 5 degrees Celsius.
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Lake Louise is freezing cold all year roundThanks to the glacial melt, the water is either frozen or freezing at all times. In fact, most lakes in the region are glacial-fed, and the rivers are equally as frosty. Locals like to take their summer soaks in Herbert Lake, which is just a ten-minute drive up the 93.
Moraine Lake is only half the size of its nearby neighbour Lake Louise, but perhaps even more scenic. It's situated at an elevation of 1883 meters in the beautiful Valley Of The Ten Peaks in Banff National Park. This glacier-fed lake becomes the most intense and vivid shade of turquoise blue.