Lake Roosevelt National Recreation Area in September
September at Lake Roosevelt National Recreation Area averages a daytime high near 76°F and an overnight low around 39°F, with about 1" of precipitation. Visitation runs about 1.1× the park's average month, which makes September an average month here.
- Average low
- 39°F
- Average high
- 76°F
Range across the year: 20°F to 86°F
- Precipitation
- 1.0 in
- Daylight
- 12.3 hours
Roughly 9% of the park's yearly visitors come in September: about 113,000 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 (2.5×) and the December low (0.3×).
On our Best Time to Visit score September rates 66/100 ("Good"). Our recommended month is May: the lightest crowds of the park's good-weather months.
The daily average of about 58°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 29 miles from the park.
Because June, July and August together draw about 54% 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 8.2-hour midwinter low and the 15.8-hour summer high.
Park-wide, 2025 drew 1,183,757 recreation visits, up 8.5% from 1,091,489 in 2024.
Across the past decade overall visitation has eased about 12.4%, 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 | 86°F / 47°F | 2.1× Very busy | 58 Fair |
| September | 76°F / 39°F | 1.1× Average | 66 Good |
| October | 59°F / 31°F | 0.6× Quiet | 56 Fair |
All twelve months at Lake Roosevelt, with the best time to visit.
Seasonal closures in September 2027
The National Park Service lists these Lake Roosevelt facilities as closed during September 2027. The dates are the park's own, read on October 11, 2026. A facility that is not listed here may still be closed, so confirm on the park's site before you go.
- Hawk Creek Campground (campground): closed all month (April 16, 2027 to October 6, 2027)
Things to do at Lake Roosevelt in September
The National Park Service tags 3 Lake Roosevelt activities for fall. Each links to the park's own page for it.
Frequently Asked Questions
September averages a daytime high near 76°F and an overnight low around 39°F at Lake Roosevelt National Recreation Area, with about 1 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 29 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is average at Lake Roosevelt National Recreation Area (about 1.1× the average month). Our best-time score rates it "Good" at 66/100. Our recommended month is May.
The busiest month is July and the quietest is December. September sits at about 1.1× the park's average, or 9% of annual visitation.
A typical September sees about 113,000 recreation visits at Lake Roosevelt National Recreation Area, based on National Park Service monthly counts from 1979–2025.
Where to stay near Lake Roosevelt in September
Booking a September trip to Lake Roosevelt National Recreation Area? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Lake Roosevelt
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.