Climate and Average Weather Year Round in Grand MaraisClimate within Grand Marais, Minnesota is consistently changing. No matter if it's bright or cloudy, expect a selection of weather patterns over the year. Starting from the gorgeous springtime flowers blooming to the warm and sun-soaked summertime days, to the scenic fall foliage, and the snow-covered landscapes during winter, Grand Marais, Minnesota presents a varied assortment of weather experiences during the year.