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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.
1 The average surface temperature of Lake Superior normally does not exceed 50 degrees farenheit. 2  The Island is accessible only by boat or floatplane. 3  Isle Royale is approximately 45 miles long and 8.5 miles across at it's widest points and contains roughly 165 miles of trails.