Weather in Yellowstone: September
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Average day temperature: | 59.3°F |
| Average night temperature: | 40.1°F | |
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Number of sunny days: | 20 days |
| Day length: | 11.7 - 13.2 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.8 in. | |
| more information | ||
14 days
forecast
forecast
| Yellowstone |
weather in
October
October
| Yellowstone |
Air temperature in September, °F
Show year:
2025
2024
2023
The highest day temperature during September of 2025 was 72°F. At the same time the lowest night temperature was 38°F. Daily and nightly averages during September were 61.3°F and 44.9°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 Yellowstone in September is 2.0 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 6.7 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: 9.4.
Best time for vacation in Yellowstone
Yellowstone on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Yellowstone
Local time: 01:51
December 21, sunday
0300
23°F
NE
9 mph
9 mph
0600
25°F
NE
7 mph
7 mph
0900
27°F
N
6 mph
6 mph
1200
30°F
N
7 mph
7 mph
1500
32°F
NE
20 mph
20 mph
1800
30°F
NE
21 mph
21 mph
2100
30°F
NE
19 mph
19 mph
December 22, monday
0000
32°F
NE
21 mph
21 mph
