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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.
Minnesota's inland lakes and streams are generally colder than 70Â° F in winter and spring. Water this cold always presents the danger of hypothermia. Surface water temperatures in western Lake Superior rarely exceed 70Â° F. Lake Superior's average surface temperature is about 40Â° F (4Â° C).