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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.
Lake Superior Water Temperature Forecast. Anyone who lived in the Upper Peninsula this past winter, or anywhere in Michigan for that matter, will forever remember the brutal winter of 2013â2014 for its scarily low temperatures, icy drives, and all-around outdoor dreariness.