Denali National Park weather in September
September in Denali National Park: cold, rainy, with clean air — a great time to visit.
#5 of 12 months in Denali National Park · #354 of 604 destinations to visit in September · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Denali National Park climate normals — September
| Daytime high | 10°C / 50°F | 🧥 cold |
|---|---|---|
| Nighttime low | 4°C / 39°F | |
| Feels like (high) | 7°C / 45°F | |
| Rainfall | 100 mm / 3.9 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 3°C / 37°F | |
| Sunshine | 6.4 h/day | |
| Daylight | 13 h | |
| Wind | 12 km/h / 7 mph | |
| Snowfall | 2.9 cm / 1.1 in | |
| Air quality (US AQI) | 23 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Denali National Park in September — FAQ
- Is September a good time to visit Denali National Park?
- September in Denali National Park: cold, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for Denali National Park on SeasonMap's comfort score (77/100).
- What is the weather like in Denali National Park in September?
- In September, Denali National Park averages a daily high of 9.9°C and a low of 3.7°C, with about 99.7 mm of rain over roughly 18 rainy days.
- What is the air quality in Denali National Park in September?
- Denali National Park has a mean US Air Quality Index of about 23 in September.
- Does it snow in Denali National Park in September?
- Denali National Park sees roughly 2.9 cm of snowfall in September.