Castle Clinton National Monument in August
August at Castle Clinton National Monument averages a daytime high near 83°F and an overnight low around 69°F, with about 4.6" of precipitation. Visitation runs about 1.5× the park's average month, which makes August a busy month here.
- Average low
- 69°F
- Average high
- 83°F
Range across the year: 28°F to 85°F
- Precipitation
- 4.6 in
- Daylight
- 13.6 hours
Roughly 12% of the park's yearly visitors come in August: about 492,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes August the 2nd-busiest of the park's twelve months, sitting between the July peak (1.6×) and the January low (0.5×).
On our Best Time to Visit score August rates 44/100 ("Poor"). Our recommended month is September: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 76°F is warm enough that midday heat is worth planning around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 5.8 miles from the park.
August falls inside the park's busiest stretch: June, July and August together pull about 37% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 13.6 hours of daylight in August to explore — between the 9.1-hour midwinter low and the 14.9-hour summer high.
Park-wide, 2025 drew 3,656,350 recreation visits, down 4.4% from 3,822,759 in 2024.
Across the past decade overall visitation has eased about 28.2%, so August may feel a touch quieter than it once did.
How August compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| July | 85°F / 70°F | 1.6× Busy | 40 Poor |
| August | 83°F / 69°F | 1.5× Busy | 44 Poor |
| September | 76°F / 62°F | 1.0× Average | 67 Good |
All twelve months at Castle Clinton, with the best time to visit.
Frequently Asked Questions
August averages a daytime high near 83°F and an overnight low around 69°F at Castle Clinton National Monument, with about 4.6 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 5.8 miles from the park, so conditions inside the park can differ, especially at other elevations.
August is busy at Castle Clinton National Monument (about 1.5× the average month). Our best-time score rates it "Poor" at 44/100. Our recommended month is September.
The busiest month is July and the quietest is January. August sits at about 1.5× the park's average, or 12% of annual visitation.
A typical August sees about 492,000 recreation visits at Castle Clinton National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Castle Clinton in August
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Top-rated places to stay near Castle Clinton
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See the full ranking of the best national parks to visit in August.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.