Grand Marais Minnesota 14 Day Weather 55604 WeatherWXcomClimate at Grand Marais, Minnesota is perpetually shifting. Whether bright or overcast, you can expect a variety of weather conditions during the year. Beginning in the stunning springtime flowers blooming to the balmy and sun-filled summer days, to the vibrant autumn foliage, and the wintry landscapes during winter, Grand Marais, Minnesota offers a varied selection of weather experiences all through the year.