What is the weather like in the Yellowstone area? Yellowstone weather can be very unpredictable so you always want to be prepared. Dress in layers so that you can add or subtract for comfort. In early spring and in the fall you will want to use heavier layers.
Traditionally in the summer Yellowstone is a sunny place. You will want to bring sunscreen. Springtime tends to be the most wet and cloudy. Fall is crisp, cool and frequently sunny. Below is our average temperatures and precipitation for the town West Yellowstone, Montana: