Surface temps on the Great Lakes have warmed to above average following a week-long stretch of hot, hot weather around Michigan. Surface temps on Lake Michigan, Lake Huron, Lake Erie and Lake Ontario range between 75 and 85 degrees, according to measurements by Great Lakes Environmental Research Laboratory. Great Lakes surface temps. Great Lakes surface temp data 1995-2015. (EPA)Related: Health officials: Avoid foam on Michigan lakes, rivers with PFAS contamination