Weather in West Yellowstone: September
 |
Average day temperature: | 64.9°F |
| Average night temperature: | 45.7°F | |
 |
Number of sunny days: | 21 days |
| Day length: | 11.7 - 13.2 hours | |
 |
Number of rainy days: | 2 days |
| Precipitation totals: | 1.1 in. | |
| more information | ||
14 days
forecast
forecast
| West Yellowstone |
weather in
October
October
| West Yellowstone |
Air temperature in September, °F
Show year:
2025
2024
2023
The highest day temperature during September of 2025 was 76°F. At the same time the lowest night temperature was 40°F. Daily and nightly averages during September were 64.3°F and 49.1°F.
Sunny, partly cloudy and cloudy days
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in West Yellowstone in September is 1.1 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 5.0 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 9.3.
Best time for vacation in West Yellowstone
West Yellowstone on a weather map
Places in USA:
Name
°F
24 Hours Forecast
West Yellowstone
Local time: 07:02
December 16, tuesday
0900
28°F
NE
10 mph
10 mph
1200
30°F
NE
9 mph
9 mph
1500
30°F
NE
10 mph
10 mph
1800
30°F
NE
11 mph
11 mph
2100
32°F
NE
13 mph
13 mph
December 17, wednesday
0000
32°F
NE
17 mph
17 mph
0300
32°F
NE
17 mph
17 mph
0600
32°F
NE
20 mph
20 mph
