Mainland Sea Caves - Winter Conditions
Follow this link for information on winter conditions at the mainland sea caves: what to wear, what to bring, how to get there, and things you should know. More »
There are current closures of areas within the Apostle Islands National Lakeshore. Click for more information and see if these closures will affect your trip. More »
Weather and Lake Conditions
Average daytime high temperatures range from 60 degrees Fahrenheit in May, to the upper 80s in mid-summer, to the mid-60s in September. Average lows vary from 40 degrees in May, to the upper 50s in mid-summer, to 50 degrees in September. Average water temperatures in May and June are only in the 40s. Even in late summer, surface temperatures rarely exceed 60 degrees, except in protected bays. Average summer winds blow at from 5 to 20 knots with waves of from one to four feet. Winds of 30 to 40 knots and 6 to 12 foot seas are possible.
Check for an up-to-date weather on Lake Superior
Near Shore Marine Weather Forecast, within 5 miles of shore
Offshore Marine Weather Forecast, beyond 5 miles from shore
Weather Station - Devils Island, WI, located on the Devils Island Lighthouse
West Lake Superior Bouy, located 48 nautical miles North of Ironwood, Michigan
Did You Know?
Apostle Islands National Lakeshore has more lighthouses than any other National Park Service area (8 historic towers on 6 islands).