June weather Summer 2023 Grand Marais MNAtmospheric conditions inside the heart of Grand Marais, Minnesota is constantly shifting. No matter if it's fair or overcast, expect an array of climate patterns during the year. Beginning in the beautiful springtime flowers blooming to the hot and sun-soaked summertime days, to the scenic fall foliage, and the snow-covered landscapes during winter, Grand Marais, Minnesota presents a varied selection of climate experiences during the year.