Yellowstone National Park weather

Q: Does it rain in Yellowstone National Park during September?

On average, there will be 5 rainy days during the month, amounting to 60.3mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry . There's a small chance that you'll catch a thunderstorm during your trip.

Q: Is it windy in Yellowstone National Park during September?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate humidity, the wind will feel chilly , so you'll want to wear layers.

Our guide to the weather in Yellowstone National Park during September

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We've looked at the most up-to-date weather data for Yellowstone National Park, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Yellowstone National Park weather in September.

What's the temperature like in Yellowstone National Park during September?

The temperature reaches around 17℃ during the daytime in September, falling away to 2℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it snow in Yellowstone National Park during September?

Possibly. There's a chance of snow during September but not as much as you might think. Check the local forecast before you leave home so that you can pack appropriate footwear and clothing.

Does it rain in Yellowstone National Park during September?

On average, there will be 5 rainy days during the month, amounting to 60.3mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Yellowstone National Park during September?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate humidity, the wind will feel chilly, so you'll want to wear layers.

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