Whitman Mission National Historic Site in September
September at Whitman Mission National Historic Site averages a daytime high near 80°F and an overnight low around 44°F, with about 0.7" of precipitation. Visitation runs about 1.2× the park's average month, which makes September a busy month here.
- Average low
- 44°F
- Average high
- 80°F
Range across the year: 27°F to 90°F
- Precipitation
- 0.7 in
- Daylight
- 12.3 hours
Roughly 10% of the park's yearly visitors come in September: roughly 4,800 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 4th-busiest of the park's twelve months, sitting between the May peak (1.7×) and the December low (0.3×).
September is our recommended month at Whitman Mission: the lightest crowds of the park's good-weather months.
The daily average of about 62°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 0.2 miles from the park.
Because June, July and August together draw about 33% 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 8.5-hour midwinter low and the 15.5-hour summer high.
Park-wide, 2025 drew 54,089 recreation visits, down 11.8% from 61,331 in 2024.
Across the past decade overall visitation has risen about 12.1%, 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 | 90°F / 52°F | 1.1× Average | 60 Good |
| September | 80°F / 44°F | 1.2× Busy | 61 Good |
| October | 66°F / 36°F | 1.1× Average | 47 Fair |
All twelve months at Whitman Mission, with the best time to visit.
Things to do at Whitman Mission in September
The National Park Service tags 5 Whitman Mission activities for fall. Each links to the park's own page for it.
- Programs at Whitman Mission NHS · 30-60 minutes
- Visit the Whitman Mission Museum
- Walk the Trails and Tour the Mission Grounds · 15-60 minutes
- Watch A Prophecy Fulfilled · 25 minutes
- Whitman Mission NHS Audio Tour · 30-90 minutes
Frequently Asked Questions
September averages a daytime high near 80°F and an overnight low around 44°F at Whitman Mission National Historic Site, with about 0.7 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 0.2 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Whitman Mission National Historic Site (about 1.2× the average month). Our best-time score rates it "Good" at 61/100. September is our recommended month for this park.
The busiest month is May and the quietest is December. September sits at about 1.2× the park's average, or 10% of annual visitation.
A typical September sees about 5,000 recreation visits at Whitman Mission National Historic Site, based on National Park Service monthly counts from 1979–2025.
Where to stay near Whitman Mission in September
Booking a September trip to Whitman Mission National Historic Site? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Whitman Mission
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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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.