Yellowstone National Park in september: average Weather, Temperature and Climate
Weather in Yellowstone National Park in september 2025
The weather in Yellowstone National Park in the month of september comes from statistical datas on the past years. You can view the weather statistics the entire month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
very bad weather 266.5cm
Weather at 6am
38°F
Clear/Sunny
58% of time
19%
14%
6%
Weather at 12pm
61°F
Clear/Sunny
67% of time
15%
6%
6%
Weather at 6pm
59°F
Clear/Sunny
62% of time
16%
10%
5%
Weather at 3am
40°F
60%
17%
13%
5%
Evolution of daily average temperature and precipitation in Yellowstone National Park in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Yellowstone National Park in september.
The climate of Yellowstone National Park in september is very bad
the weather in Yellowstone National Park in september is quite dry (with 2.5in of precipitation over 4 days). It should be noted an improvement from the previous month since in august it receives an average of 2.2in of rainfall over 4 days.
The climate is quite cool here september, but it is endurable when dressing warm. The thermometer averaged maximum of 63°F. The minimum is 38°F. Thus, the mean temperature average on this month of september in Yellowstone National Park is 50°F. Note that seasonal normals in contrast with those observed in Yellowstone National Park in the month of september with a maximum record of 81°F in 2020 and a minimum record of 9°F in 2014. You can expect to have about 10 days with temperatures below 32°F, or 33% of the month.
On average, in Yellowstone National Park, the days of september last 12:30. Sunrise is at 06:02 and sets at 18:32.
With good weather conditions, the month of september is a good month to go in Yellowstone National Park.
September: another location in the United States (USA)?
If you want to go to the United States (USA) in september, there are destinations with better weather than Yellowstone National Park:
In september, Grand Canyon, Hawaii (Honolulu), Las Vegas, Seattle, Denver and Minneapolis (Minnesota) have perfect weather.
Furthermore, California, Louisiana, Washington D. C., Atlanta, Boston and Chicago have good weather.
Finally, Miami (Florida), Cody (Wyoming), Crater Lake (Oregon) , Dauphin Island (Alabama), Helena (Montana) and Montana have a tolerable climate, but better than Yellowstone National Park.
Seasonal average climate and temperature of Yellowstone National Park in september
Check below seasonal norms These statistics are compiled from the weather statements of the past years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 50°F | ||||
| Highest temperature | 63°F | ||||
| Lowest temperature | 38°F | ||||
| Highest record temperature | 81°F (2020) | ||||
| Lowest record temperature | 9°F (2014) | ||||
| Number of days at +65°F | 16 day(s) (53%) | ||||
| Number of days at -32°F | 10 day(s) (33%) | ||||
| Wind | |||||
| Wind speed | 20km/h | ||||
| Wind temperature | 34°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 2.5in | ||||
| Number of days with rainfall | 4 day(s) (13%) | ||||
| Record daily rainfall | 1.4in (2017) | ||||
| Snowfall | 266.5cm | ||||
| Other climate data | |||||
| Humidity | 73% | ||||
| Visibility | 9.41km | ||||
| Cloud cover | 19% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:02 | ||||
| Time of sunset | 18:32 | ||||
| Length of day | 12:30 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last september?
Here is the day by day recorded weather in Yellowstone National Park in september 2024:
49°F to 77°F
49°F to 76°F
49°F to 67°F
41°F to 70°F
43°F to 74°F
47°F to 76°F
47°F to 76°F
47°F to 76°F
47°F to 70°F
45°F to 72°F
50°F to 67°F
36°F to 43°F
36°F to 47°F
38°F to 59°F
41°F to 65°F
47°F to 65°F
49°F to 58°F
36°F to 40°F
41°F to 56°F
36°F to 58°F
40°F to 59°F
40°F to 59°F
43°F to 56°F
43°F to 67°F
49°F to 68°F
50°F to 65°F
45°F to 67°F
47°F to 70°F
49°F to 68°F
40°F to 50°F
Map: other cities in the United States (USA) in september
Cities near Yellowstone National Park:
| Grand Teton National Park (Wyoming) in september | very bad weather |
| Jackson Hole in september | very bad weather |
| Cody (Wyoming) in september | tolerable weather |
| Helena (Montana) in september | tolerable weather |
| Montana in september | tolerable weather |
| Wyoming in september | good weather |
| Salt Lake City in september | good weather |
| Boise (Idaho) in september | perfect weather |
| Glacier National Park (Montana) in september | very bad weather |
| Utah in september | perfect weather |
| Mount Rushmore in september | good weather |
| Arches National Park (Utah) in september | perfect weather |
Click over cities on the map for information about the weather in september.
Yellowstone National Park
perfect weather
good
tolerable
bad
very bad
Weather data for Yellowstone National Park in september:
Weather data for Yellowstone National Park for september are derived from an average of the weather forecast since 2009 in Yellowstone National Park. There is a margin of error and these forecasts are to be considered as general information only. The weather in Yellowstone National Park can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Yellowstone National Park.