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Apostle Islands National Lakeshore Climate
Summer temperatures average 75-80 degrees F. during the day and 55 degrees F. at night. Summer thunderstorms commonly create severe, rapidly changing wind and wave conditions. We recommend visitors bring layers of clothing and rain gear. Sea kayakers should use wet or dry suits. Winter temperatures of -10 degrees F. are not uncommon.
Maine ocean islands provide the only nesting sites for Atlantic puffins in the United States. Eastern Egg Rock in the midcoast region, Seal Island and Matinicus Rock at the mouth of Penobscot Bay, and Machias Seal Island and Petit Manan Island off the downeast coast provide habitat for more than 4,000 puffins each summer.