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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.
Average surface temperatures for both Lake Superior and Lake Michigan have dropped: Superior's went from from 53.7 degrees on October 11, 2013 to 47.6 degrees Saturday, while Michigan's went from 62.1 degrees to 56.0 degrees, MLive.com reported.ake Michigan, meanwhile, had an average surface temperature of 53.1 degrees. On Friday, the Coast Guard encouraged boaters to wear appropriate clothing for the Lake Michigan temperatures in a news release. 'Survival time is greatly diminished for someone immersed in water below 70 degrees,' Cmdr.