Grand Marais June 2023 Historical Weather Data Minnesota Weather in Grand Marais, Minnesota is consistently changing. No matter if it's sunny or cloudy, you can expect a selection of weather patterns throughout the year. Starting from the gorgeous springtime flowers blossoming to the balmy and sun-filled summer days, to the scenic fall foliage, and the wintry landscapes during winter, Grand Marais, Minnesota presents a diverse assortment of weather experiences during the year.