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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.
Excerpt from Andrew Freedmanâs Climate Central piece on record Great Lakes water temps in 2012. The all-time daily average high temperature record for Lake Superior is 71Â°F, which was recorded in mid-August 2010.With a few more weeks of warming left, that record is in jeopardy.xcerpt from Andrew Freedmanâs Climate Central piece on record Great Lakes water temps in 2012. The all-time daily average high temperature record for Lake Superior is 71Â°F, which was recorded in mid-August 2010.