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Get the monthly weather forecast for Yellowstone National Park, WY, including daily high/low, historical averages, to help you plan ahead.
September Weather in Yellowstone National Park. I write with a bit of a smirk on my face that Yellowstone National Park averages a high of 62°F in September and a low of 31°F. What that really means is the high (and will be) anywhere between 80°F and 40°F – maybe even 90°F and 30°F.
We’re going to lay out all the important considerations if you’re debating a trip to Yellowstone in September: weather, crowds, where to stay, wildlife, road closures, and if it’s overall a good time to make your first trip here.
September Weather in Yellowstone National Park Wyoming, United States. Daily high temperatures decrease by 12°F, from 70°F to 57°F, rarely falling below 43°F or exceeding 78°F. Daily low temperatures decrease by 8°F, from 39°F to 31°F, rarely falling below 23°F or exceeding 47°F.
Weather in September. Yellowstone is a very large park with a wide range of elevations, so the weather you experience will depend greatly on where you are and what elevation you are at. Generally, the weather in September in Yellowstone is variable, with warm days and chilly nights.
Spring and Fall. Daytime temperatures range from 30°F to the 60°F (0°C to 16°C) with overnight lows in the teens to single digits (-5°C to -20°C). Snow is common in the spring and fall with regular accumulations of 12 inches (30.5 cm) in a 24-hour period.
The weather in Yellowstone during the autumn months can vary greatly between weeks and even days. Temperatures typically fall between 20 degrees Fahrenheit and 65 degrees Fahrenheit. Days get gradually shorter as winter nears, and temperatures tend to drop rapidly once the sun goes down.