Grand Portage National Monument - Climate

Grand Portage National Monument by National Parks Service

Weather conditions change frequently, due to the site's location on the north shore of Lake Superior. Cool onshore lake breezes are common in spring, summer and fall along with an occasional shower. Summer inland temperatures can reach into the 80's and 90's but are usually 10 to 15 degrees cooler by Lake Superior. Winter weather can be very cold and windy, with consecutive days of sub-zero temperatures, followed by calm sunny moderate temperatures in the 20's and 30's.