Katmai National Park in September
In September, Katmai National Park averages a high of 54°F and a low of 39°F, with 5.1 inches of precipitation (rain plus melted snow). About 5,800 people visit, the 3rd busiest of 12 (moderate). Days are 12 hours 43 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 54° / 39°F
- Precipitation
- 5.1in
- Snow
- –in
- Daylight
- 12h 43m
- Visitors
- 5,800
- Crowds
- Moderate
Best months for weather and crowds instead: June (moderate), July (very busy) and August (busy).
Weather 1991–2020 averages at King Salmon 42 SE, AK, 36.9 miles from the park's center, 661 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Lake Clark National Park | 58° / 44° | Quiet | Mild, wet |
| Kenai Fjords National Park | 56° / 43° | Quiet | Mild, wet |
| Denali National Park | 50° / 33° | Moderate | Cool |
| Wrangell-St. Elias National Park | 55° / 33° | Quiet | Mild, wet |
| Glacier Bay National Park | 54° / 43° | Busy | Cool |
Closures, reservations and alerts: Katmai National Park on nps.gov
All twelve months at Katmai · National parks to visit in September