Grand Marais Minnesota 14 Day Weather 55604 WeatherWXcomClimate inside the heart of Grand Marais, Minnesota is perpetually varying. Whether it's clear or overcast, expect a range of climate conditions during the year. Beginning in the gorgeous spring flowers blooming to the balmy and sun-filled summer days, to the colorful fall foliage, and the wintry landscapes in winter, Grand Marais, Minnesota offers a wide range of weather experiences all through the year.