Apostle Islands National Lakeshore - Climate

Apostle Islands National Seashore by National Parks Service

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.