Park Love...
What is yellowstone weather in september
This question relates to the items listed below. Click each link for more information
Yellowstone National Park, Wyoming
9 years ago
Expert Answer
53 Answers
5Helpful Answer Rating

Let me start off by warning you about Yellowstone's weather--it's unpredictable! Remember to always bring rain gear, warm clothing and thermal underwear, as it can snow any day of the year in Yellowstone. If you are taking a multiple day pack trip, you should take wool socks, pants and a shirt.

In September, temperatures average 10 to 20 degrees lower than those in the summers. This usually amounts to highs in the 40s to 60s. Overnight temperatures can fall into the teens and single digits, and snowstorms increase in frequency and intensity as winter approaches.
I hope this information helps you plan your trip!
9 years ago