Average surface water temperature in lakes Michigan, Superior, Huron and Erie are colder than usual for this time of year, with the warmest. Slowed by a cold May, the Great Lakes are slightly cooler than usual for this time of year. Colder waters hovering around 43 degrees are hugging the state’s west coast, according to the Great Lakes Observing System, a nonprofit group that tracks water conditions in the Great Lakes. The National Weather Service says there’s a 33% to 40% chance that Michigan, alongside other states bordering the western Great Lakes, experience above-normal temperatures this summer. The Great Lakes region could experience occasional lower temperatures during the summer thanks to the polar jet stream drawing down cooler air from the Arctic.