North Cascades National Park in September
September at North Cascades National Park averages a daytime high near 71°F and an overnight low around 49°F, with about 3.4" of precipitation. Visitation runs about 2.4× the park's average month, which makes September a very busy month here.
- Average low
- 49°F
- Average high
- 71°F
Range across the year: 30°F to 79°F
- Precipitation
- 3.4 in
- Daylight
- 12.3 hours
Roughly 20% of the park's yearly visitors come in September: roughly 5,700 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 3rd-busiest of the park's twelve months, sitting between the July peak (3.6×) and the January low (0×).
On our Best Time to Visit score September rates 54/100 ("Fair"). Our recommended month is May: the lightest crowds of the park's good-weather months.
The daily average of about 60°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 2.9 miles from the park.
Because June, July and August together draw about 70% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.
You'll have about 12.3 hours of daylight in September to explore — between the 8.1-hour midwinter low and the 15.9-hour summer high.
Park-wide, 2025 drew 46,925 recreation visits, up 184.7% from 16,485 in 2024.
Across the past decade overall visitation has risen about 38.2%, so a September visit is likely to feel busier than it did a few years ago.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 79°F / 54°F | 3.6× Very busy | 53 Fair |
| September | 71°F / 49°F | 2.4× Very busy | 54 Fair |
| October | 58°F / 42°F | 0.5× Quiet | 56 Fair |
All twelve months at North Cascades, with the best time to visit.
Things to do at North Cascades in September
The National Park Service tags 5 North Cascades activities for fall. Each links to the park's own page for it.
Frequently Asked Questions
September averages a daytime high near 71°F and an overnight low around 49°F at North Cascades National Park, with about 3.4 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 2.9 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is very busy at North Cascades National Park (about 2.4× the average month). Our best-time score rates it "Fair" at 54/100. Our recommended month is May.
The busiest month is July and the quietest is January. September sits at about 2.4× the park's average, or 20% of annual visitation.
A typical September sees about 6,000 recreation visits at North Cascades National Park, based on National Park Service monthly counts from 1979–2025.
Where to stay near North Cascades in September
Booking a September trip to North Cascades National Park? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near North Cascades
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Visiting North Cascades in September?
Get crowd forecasts and lodging deals for North Cascades by email. No spam, unsubscribe anytime.
See the full ranking of the best national parks to visit in September.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.