United States · 1991–2020 normal
West Yellowstone in
September.
Typical September weather in West Yellowstone: 20.5°C by day, -1.5°C at night, 33 mm of rain over 5 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high20.5°C
Typical low-1.5°C
Rain33 mm
Wet days5
Comfort score 57 this month (August leads the year at 66). Daylight is calculated as 12 h 28 from latitude 44.66°.
Event window
Frost-level nights in September
The measured night-time normal is -1.5°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5685767
- NOAA station
- USS0011E07S · West Yellowstone
- Station distance
- 1.1 km from the place centre
- Coverage
- Good coverage · 22 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.