Yellowstone National Park weather in September (United States of America)

You can expect very pleasant temperatures during the day in September. The average maximum daytime temperature in Yellowstone National Park in September lies at 19.2°C (66.56°F). Bring a thick blanket because during the night it can cool down to temperatures below freezing. The average minimum temperature is -1.5°C (29.3°F) (usually the minimum temperature is noted at night).

The amount of rain/snow during this month is moderate with an average of 37mm (1.5in). It rains/snows an average of 5 days of the month.


So what to wear in September? Bring a rain jacket just in case since it will be raining a few days during this period. Plan on layering your clothes. Some days or part of the day it will be nice and warm and some moments it can be a bit chilly.

No idea where to travel to this year? We now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.

For other monthly average weather and what to do in September look at the numbers below.

Monthly Averages in September

Show in Fahrenheit

Min Temperature -1 °C
Max Temperature 19 °C
Chance of Rain 17%
Precipitation 37mm
Rainy Days 5
* Climate data from: West Yellowstone, the United States of America (48 KM, 30 Miles).

 

Where to stay in Yellowstone National Park

Where to go in the United States of America in September

Find out more about the weather in the United States of America in September and which places have the best weather conditions in this month.

Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20-29ºC / 68-84ºF and not too much precipitation (less than 90mm / 3.5inch a month).

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in September.

Cycling
10/10
Walking
10/10
Camping
2/10
Outdoor sports
10/10

Weather Forecasts for Yellowstone National Park

MON   Jan 30
-13°C | -40°C
SSE 13 kmph
TUE   Jan 31
-10°C | -31°C
S 15 kmph
Partly cloudy

Partly cloudy

WED   Feb 01
-6°C | -27°C
S 11 kmph
Freezing fog

Freezing fog

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in Yellowstone National Park.

Our site offers climate and forecast data for almost all countries in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which suggests which destination suits your ideal climate conditions. Find out where to go with our weather planner.