Bozeman weather in September
September in Bozeman: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Bozeman · #87 of 604 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Bozeman climate normals — September
| Daytime high | 23°C / 73°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Feels like (high) | 21°C / 70°F | |
| Rainfall | 60 mm / 2.4 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 62% | 💧 humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 12.5 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 1.2 cm / 0.5 in | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Bozeman?
Loading map…
Bozeman in September — FAQ
- Is September a good time to visit Bozeman?
- September in Bozeman: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Bozeman on SeasonMap's comfort score (89/100).
- What is the weather like in Bozeman in September?
- In September, Bozeman averages a daily high of 23°C and a low of 7.7°C, with about 60 mm of rain over roughly 8.4 rainy days.
- What is the air quality in Bozeman in September?
- Bozeman has a mean US Air Quality Index of about 35 in September.
- Does it snow in Bozeman in September?
- Bozeman sees roughly 1.2 cm of snowfall in September.