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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.
Superior 10 Day Weather. 1  Thursday:The Superior forecast for Apr 13 is 43 degrees and Sunny. There is 83 percentage chance of rain and 5 mph winds from the East. 2  Friday:The Superior forecast for Apr 14 is 44 degrees and Cloudy. There is 81 percentage chance of rain and 9 mph winds from the East-Southeast.