Theodore Roosevelt Island in September
September at Theodore Roosevelt Island averages a daytime high near 81°F and an overnight low around 64°F, with about 3.9" of precipitation. Visitation runs about 1.2× the park's average month, which makes September a busy month here.
- Average low
- 64°F
- Average high
- 81°F
Range across the year: 30°F to 90°F
- Precipitation
- 3.9 in
- Daylight
- 12.2 hours
Roughly 10% of the park's yearly visitors come in September: about 17,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 2nd-busiest of the park's twelve months, sitting between the October peak (1.3×) and the February low (0.7×).
On our Best Time to Visit score September rates 48/100 ("Fair"). Our recommended month is May: 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 3.7 miles from the park.
Because June, July and August together draw about 26% 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 9.3-hour midwinter low and the 14.7-hour summer high.
Park-wide, 2025 drew 159,828 recreation visits, down 8.6% from 174,954 in 2024.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 88°F / 71°F | 1.2× Busy | 41 Poor |
| September | 81°F / 64°F | 1.2× Busy | 48 Fair |
| October | 69°F / 52°F | 1.3× Busy | 37 Poor |
All twelve months at Theodore Roosevelt Island, with the best time to visit.
Things to do at Theodore Roosevelt Island in September
The National Park Service tags 3 Theodore Roosevelt Island activities for fall. Each links to the park's own page for it.
- Discover Theodore Roosevelt Island · 1-3 hours
- Multi-Park Loop
- Silver Line - DC Metro · 1-2 days
Frequently Asked Questions
September averages a daytime high near 81°F and an overnight low around 64°F at Theodore Roosevelt Island, with about 3.9 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 3.7 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Theodore Roosevelt Island (about 1.2× the average month). Our best-time score rates it "Fair" at 48/100. Our recommended month is May.
The busiest month is October and the quietest is February. September sits at about 1.2× the park's average, or 10% of annual visitation.
A typical September sees about 17,000 recreation visits at Theodore Roosevelt Island, based on National Park Service monthly counts from 1979–2025.
Where to stay near Theodore Roosevelt Island in September
Booking a September trip to Theodore Roosevelt Island? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Theodore Roosevelt Island
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Visiting Theodore Roosevelt Island in September?
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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.