Climate and Average Weather Year Round in Grand MaraisAtmospheric conditions in Grand Marais, Minnesota is always shifting. Whether it's fair or cloudy, look forward to an array of climate conditions during the year. Beginning in the gorgeous springtime flowers blooming to the hot and sun-filled summer days, to the vibrant fall foliage, and the snowy landscapes during winter, Grand Marais, Minnesota offers a diverse selection of weather experiences during the year.