Climate and Average Weather Year Round in Grand MaraisWeather in the heart of Grand Marais, Minnesota is perpetually shifting. No matter if it's bright or cloudy, expect a selection of climate patterns over the year. Beginning in the gorgeous springtime flowers blossoming to the hot and sun-soaked summertime days, to the vibrant autumn foliage, and the snowy landscapes in winter, Grand Marais, Minnesota presents a varied variety of climate experiences throughout the year.