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Lake Superior surface-water temperatures averaged 1 or 2 degrees Fahrenheit below their long-term average at the end of May. According to the new forecast, surface temperatures over the deepest parts of the lakeâbetween 1,000 and 1,300 feetâwill be at least 6 degrees below normal by August and will still be in the 40s.
So Lake Superior is 6.1 degrees colder than this time last year, and 3.5 degrees colder than normal. Lake Michigan has an average surface water temperature of 56.0 degrees, while last year at this time it was 62.1 degrees. The long-term average water temperature on Lake Michigan for October 11 is 58.4 degrees. Lake Michigan is also 6.1 degrees colder than this time last year, and 2.4 degrees colder than average. Lake Huron is 5 degrees colder than last year, and only 1.5 degrees colder than normal.