Grand Marais MN Monthly Weather Forecast weathercomWeather in the heart of Grand Marais, Minnesota is consistently changing. Whether it is sunny or cloudy, expect a range of climate conditions during the year. From the breathtaking springtime flowers blossoming to the warm and sun-filled summer days, to the colorful fall foliage, and the snow-covered landscapes in winter, Grand Marais, Minnesota provides a diverse selection of climate experiences during the year.