Glacier National Park weather in September
September in Glacier National Park: cool, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Glacier National Park · #165 of 604 destinations to visit in September · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Glacier National Park climate normals — September
| Daytime high | 16°C / 60°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Feels like (high) | 12°C / 54°F | |
| Rainfall | 52 mm / 2 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 63% | 💧 humid |
| Dew point | 3°C / 37°F | |
| Sunshine | 10 h/day | |
| Daylight | 12.6 h | |
| Wind | 15 km/h / 9 mph | |
| Snowfall | 8.7 cm / 3.4 in | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Glacier National Park?
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Glacier National Park in September — FAQ
- Is September a good time to visit Glacier National Park?
- September in Glacier National Park: cool, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Glacier National Park on SeasonMap's comfort score (86/100).
- What is the weather like in Glacier National Park in September?
- In September, Glacier National Park averages a daily high of 15.5°C and a low of 5.7°C, with about 52 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Glacier National Park in September?
- Glacier National Park has a mean US Air Quality Index of about 37 in September.
- Does it snow in Glacier National Park in September?
- Glacier National Park sees roughly 8.7 cm of snowfall in September.