Katmai National Park weather in September
September in Katmai National Park: cool, rainy, with clean air — a great time to visit.
#5 of 12 months in Katmai National Park · #376 of 604 destinations to visit in September · comfort 75/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Katmai National Park climate normals — September
| Daytime high | 12°C / 53°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 44°F | |
| Feels like (high) | 10°C / 50°F | |
| Rainfall | 148 mm / 5.8 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 6°C / 43°F | |
| Sunshine | 6 h/day | |
| Daylight | 12.8 h | |
| Wind | 10 km/h / 6 mph | |
| Snowfall | 6.9 cm / 2.7 in | |
| Air quality (US AQI) | 24 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Katmai National Park?
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Katmai National Park in September — FAQ
- Is September a good time to visit Katmai National Park?
- September in Katmai National Park: cool, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for Katmai National Park on SeasonMap's comfort score (75/100).
- What is the weather like in Katmai National Park in September?
- In September, Katmai National Park averages a daily high of 11.5°C and a low of 6.4°C, with about 148.1 mm of rain over roughly 18.2 rainy days.
- What is the air quality in Katmai National Park in September?
- Katmai National Park has a mean US Air Quality Index of about 24 in September.
- Does it snow in Katmai National Park in September?
- Katmai National Park sees roughly 6.9 cm of snowfall in September.