Glacier Bay National Park weather in September
September in Glacier Bay National Park: cold, soaked, with clean air — a good time to visit.
#5 of 12 months in Glacier Bay National Park · #488 of 604 destinations to visit in September · comfort 63/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Glacier Bay National Park climate normals — September
| Daytime high | 8°C / 47°F | 🧥 cold |
|---|---|---|
| Nighttime low | 5°C / 41°F | |
| Feels like (high) | 6°C / 43°F | |
| Rainfall | 539 mm / 21.2 in | ⛈ soaked |
| Rainy days | 22 days | |
| Humidity | 92% | 💦 very humid |
| Dew point | 5°C / 41°F | |
| Sunshine | 6.2 h/day | |
| Daylight | 12.8 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 35.5 cm / 14 in | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Glacier Bay National Park?
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Glacier Bay National Park in September — FAQ
- Is September a good time to visit Glacier Bay National Park?
- September in Glacier Bay National Park: cold, soaked, with clean air — a good time to visit. It ranks #5 of 12 months for Glacier Bay National Park on SeasonMap's comfort score (63/100).
- What is the weather like in Glacier Bay National Park in September?
- In September, Glacier Bay National Park averages a daily high of 8.1°C and a low of 4.9°C, with about 539.2 mm of rain over roughly 21.8 rainy days.
- What is the air quality in Glacier Bay National Park in September?
- Glacier Bay National Park has a mean US Air Quality Index of about 30 in September.
- Does it snow in Glacier Bay National Park in September?
- Glacier Bay National Park sees roughly 35.5 cm of snowfall in September.