Saint Croix National Scenic Riverway in September
September at Saint Croix National Scenic Riverway averages a daytime high near 71°F and an overnight low around 50°F, with about 3.6" of precipitation. Visitation runs about 1.5× the park's average month, which makes September a busy month here.
- Average low
- 50°F
- Average high
- 71°F
Range across the year: 5°F to 81°F
- Precipitation
- 3.6 in
- Daylight
- 12.3 hours
Roughly 13% of the park's yearly visitors come in September: about 97,000 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 July peak (3.1×) and the December low (0×).
On our Best Time to Visit score September rates 63/100 ("Good"). Our recommended month is May: the lightest crowds of the park's good-weather months.
The daily average of about 61°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 10.6 miles from the park.
Because June, July and August together draw about 66% 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 852,296 recreation visits, down 5.4% from 900,828 in 2024.
Across the past decade overall visitation has risen about 20.9%, 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 / 58°F | 2.5× Very busy | 59 Fair |
| September | 71°F / 50°F | 1.5× Busy | 63 Good |
| October | 57°F / 38°F | 0.7× Quiet | 55 Fair |
All twelve months at Saint Croix, with the best time to visit.
Frequently Asked Questions
September averages a daytime high near 71°F and an overnight low around 50°F at Saint Croix National Scenic Riverway, with about 3.6 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 10.6 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Saint Croix National Scenic Riverway (about 1.5× the average month). Our best-time score rates it "Good" at 63/100. Our recommended month is May.
The busiest month is July and the quietest is December. September sits at about 1.5× the park's average, or 13% of annual visitation.
A typical September sees about 97,000 recreation visits at Saint Croix National Scenic Riverway, based on National Park Service monthly counts from 1979–2025.
Where to stay near Saint Croix in September
Booking a September trip to Saint Croix National Scenic Riverway? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Saint Croix
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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.