North Cascades National Park in September
In September, North Cascades National Park averages a high of 71°F and a low of 50°F, with 3.5 inches of precipitation (rain plus melted snow). About 7,200 people visit, the 3rd busiest of 12 (busy). Days are 12 hours 31 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 71° / 50°F
- Precipitation
- 3.5in
- Snow
- 0in
- Daylight
- 12h 31m
- Visitors
- 7,200
- Crowds
- Busy
September is one of the best months to visit: mild weather with busy crowds.
Weather 1991–2020 averages at Newhalem, WA, 11.6 miles from the park's center, 525 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Ross Lake National Recreation Area | 70° / 50° | Busy | Mild |
| Olympic National Park | 68° / 48° | Very busy | Mild |
| Mount Rainier National Park | 57° / 41° | Moderate | Mild |
| Lake Roosevelt National Recreation Area | 73° / 40° | Moderate | Mild |
| Fort Vancouver National Historic Site | 76° / 52° | Moderate | Mild |
Closures, reservations and alerts: North Cascades National Park on nps.gov
All twelve months at North Cascades · National parks to visit in September