Best Time to Visit Castle Clinton National Monument
SeptemberBest month to visit
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Visit Castle Clinton in September
September offers pleasant weather with noticeably thinner crowds (shoulder season). For comparison, July is the most crowded month (~1.6× the average month) and January is the quietest.
Annual visits
3.7M
2025
Busiest month
Jul
1.6× avg
Quietest month
Jan
0.5× avg
10-yr trend
falling
-28.2%
How crowded is Castle Clinton by month?
Relative crowd level by month (1.0 = the park's average month), from NPS visitation records 1979–2025.
Month-by-month crowd, weather & daylight
| Month | Crowd level | Best-time score | Avg high / low | Daylight |
|---|---|---|---|---|
| January | Very quiet | 43 Poor | 40°F / 28°F | 9.4 h |
| February | Very quiet | 44 Poor | 42°F / 30°F | 10.4 h |
| March | Quiet | 37 Poor | 50°F / 36°F | 11.7 h |
| April | Average | 52 Fair | 62°F / 46°F | 13.1 h |
| May | Busy | 61 Good | 71°F / 55°F | 14.3 h |
| June | Busy | 58 Fair | 80°F / 64°F | 14.9 h |
| July | Busy | 40 Poor | 85°F / 70°F | 14.6 h |
| August | Busy | 44 Poor | 83°F / 69°F | 13.6 h |
| September★ best | Average | 67 Good | 76°F / 62°F | 12.3 h |
| October | Average | 52 Fair | 65°F / 51°F | 10.9 h |
| November | Quiet | 49 Fair | 54°F / 42°F | 9.7 h |
| December | Average | 27 Poor | 44°F / 34°F | 9.1 h |
Climate normals (1991–2020) from the nearest NOAA station (USW00094728, ~5.8 mi away).
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About visiting Castle Clinton
Castle Clinton National Monument is a National Monument in NY and one of the busier parks in the system, drawing about 3.7 million recreation visits in 2025. Visitation has eased over the past decade, down about 28.2%. Crowds concentrate sharply by season: July is the busiest month at about 1.6× the park's average month, while January is the calmest at roughly 0.5× — a 3-to-1 swing between high and low season. Roughly 37% of the year's visitors arrive in the three summer months of June, July and August alone, so timing a trip outside that window is the single biggest lever on how crowded the park feels. Weather swings from an average high-season warmth near 78°F in July down to about 34°F in January, with the wettest stretch in July and meaningful snowfall around February. About 7 months a year see comfortable average temperatures in the 50–80°F range, which is part of why crowd timing and weather timing don't always line up. The sweet spot is September: pleasant weather with noticeably thinner crowds (shoulder season). Visit then and you trade a little peak-season certainty for noticeably shorter lines and easier parking than the July rush. Daylight ranges from about 9.1 hours in midwinter to 14.9 hours near the summer solstice, which shapes how much ground you can cover in a day. These crowd figures are drawn from 1979–2025 of National Park Service visitor-use records, paired with 1991–2020 NOAA climate normals, and are updated as new monthly data is released.
Park overview
Located at the southern tip of Manhattan, Castle Clinton marks the place where New York City began and reflects the growth of both the city and the nation. Built to defend the harbor during the War of 1812, it has since welcomed theatergoers, immigrants, and sightseers—and today continues to greet millions of visitors to New York Harbor.
Weather & conditions
Castle Clinton National Monument has a variety of weather. New York City has hot summers and cold winters. Spring can have heavy rains and Autumn can be cool. http://forecast.weather.gov/MapClick.php?CityName=New+York&state=NY&site=OKX&lat=40.7198&lon=-73.993#.Vqj8OvkrJlZ
Park overview text courtesy of the National Park Service — official park site.
Where to stay near Castle Clinton
Hotels, cabins, lodges and vacation rentals near Castle Clinton National Monument — live availability and prices to plan your trip. September is our pick for the best balance of light crowds and good weather.
Top-rated places to stay near Castle Clinton
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Getting to Castle Clinton
The nearest airport is LaGuardia Airport (LGA), about 14 mi (27 min drive) away. Most visitors reach Castle Clinton by car.
Frequently Asked Questions
September offers pleasant weather with noticeably thinner crowds (shoulder season) at Castle Clinton National Monument. The park is busiest in July (about 1.6× the average month) and quietest in January.
July is the busiest month at Castle Clinton National Monument, running roughly 1.6 times the park's average monthly visitation.
January is the quietest month at Castle Clinton National Monument, at about 0.5× the average month — a good choice if you want to avoid crowds.
Castle Clinton National Monument recorded about 3,656,350 recreation visits in 2025. Visitation has been falling over the past decade (-28.2%).
Based on 1991–2020 climate normals, the warmest month at Castle Clinton National Monument averages about 78°F (July). See the month-by-month table above for the full picture.
LaGuardia Airport (LGA) is the closest airport to Castle Clinton National Monument, about 14 mi (27 min drive) away.
Nearby parks to visit
Keep exploring
Water quality of lakes near Castle Clinton
If you are planning to swim, paddle or fish on this trip, these graded lakes are within a 40-mile drive. Grades are A–F from EPA and state-agency sampling.
- Oakland Lake water qualityGrade — · 14 mi · NY
- Lake Lucille water qualityGrade — · 33 mi · NY
- Greenwood Lake water qualityGrade — · 38 mi · NY
- Tomkins Lake water qualityGrade — · 39 mi · NY
Beach water quality near Castle Clinton
Beaches within a 40-mile drive, graded on multi-year bacteria sampling from EPA BEACON — worth checking before you plan a swim day.
- Coney Island Beach - Brighton 6th - Ocean Parkway water qualityGrade A · 9 mi · NY
- Coney Island - W. 8th St. To Pier water qualityGrade A · 9 mi · NY
- Locust Point Yacht Club water qualityGrade A · 14 mi · NY
- Middletown Township At Army Rec. Beach North water qualityGrade A · 16 mi · NJ
- Silver Point Beach Club water qualityGrade A · 17 mi · NY
Sources: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI U.S. Climate Normals 1991–2020. Crowd index = a month's visits ÷ the park's average month.