Thaddeus Kosciuszko National Memorial in September
September at Thaddeus Kosciuszko National Memorial averages a daytime high near 80°F and an overnight low around 63°F, with about 4.9" of precipitation. Visitation runs about 1.2× the park's average month, which makes September a busy month here.
- Average low
- 63°F
- Average high
- 80°F
Range across the year: 28°F to 89°F
- Precipitation
- 4.9 in
- Daylight
- 12.2 hours
Roughly 10% of the park's yearly visitors come in September: about 510 recreation visits in a typical year, based on National Park Service monthly counts from 1981 to 2025.
That makes September the 4th-busiest of the park's twelve months, sitting between the July peak (1.8×) and the January low (0.4×).
On our Best Time to Visit score September rates 58/100 ("Fair"). Our recommended month is October: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 72°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 1.7 miles from the park.
Because June, July and August together draw about 39% 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 12.2 hours of daylight in September to explore — between the 9.2-hour midwinter low and the 14.8-hour summer high.
Park-wide, 2013 drew 1,682 recreation visits, down 17.8% from 2,045 in 2012.
Across the past decade overall visitation has eased about 49%, so September may feel a touch quieter than it once did.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 87°F / 70°F | 1.7× Very busy | 35 Poor |
| September | 80°F / 63°F | 1.2× Busy | 58 Fair |
| October | 68°F / 51°F | 1.1× Average | 55 Fair |
All twelve months at Thaddeus Kosciuszko, with the best time to visit.
Frequently Asked Questions
September averages a daytime high near 80°F and an overnight low around 63°F at Thaddeus Kosciuszko National Memorial, with about 4.9 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 1.7 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Thaddeus Kosciuszko National Memorial (about 1.2× the average month). Our best-time score rates it "Fair" at 58/100. Our recommended month is October.
The busiest month is July and the quietest is January. September sits at about 1.2× the park's average, or 10% of annual visitation.
A typical September sees about 1,000 recreation visits at Thaddeus Kosciuszko National Memorial, based on National Park Service monthly counts from 1981–2025.
Where to stay near Thaddeus Kosciuszko in September
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Top-rated places to stay near Thaddeus Kosciuszko
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See the full ranking of the best national parks to visit in September.
Source: National Park Service Visitor Use Statistics (1981–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.