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West Yellowstone weather in September 2025
Expect 64°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in West Yellowstone in September. Check more long-term weather averages for West Yellowstone in September before you book your next holiday to Montana in 2025/2026.
- 6464°F max day temperature
- 9 hours of sunshine per day
- 88 days with some rainfall
- 3232°F min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 1.71.7 inches of monthly rainfall
- 66 (High) UV index
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Recommended for Montana
The September weather guide for Montana (West Yellowstone) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
More about the USA
How hot is it in West Yellowstone in September?
Daytime temperatures usually reach 64°F in West Yellowstone in September, falling to 32°F at night.
How sunny is it in West Yellowstone in September?
There are normally 9 hours of bright sunshine each day in West Yellowstone in September - that's 69% of daylight hours.
Does it rain in West Yellowstone in September?
There are usually 8 days with some rain in West Yellowstone in September and the average monthly rainfall is 1.7 inches.
West Yellowstone September sunrise & sunset times
Browse the sunrise and sunset times for West Yellowstone in September 2025. Select a month to view West Yellowstone sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:47 | 19:00 |
Monday, 15th September 2025 | 06:04 | 18:34 |
Tuesday, 30th September 2025 | 06:22 | 18:06 |
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