Castle William Light is a lighthouse in New York County, New York. It lies in or next to Governors Island National Monument, so park hours, fees and rules apply. The nearest town is Financial District, about 1.9 km (1.2 mi) away (Castle William Light lies SSW of town).
Sunrise & sunset directions
At Castle William Light the sunrise point swings a long way through the year: about 58° (ENE) at the June solstice and 121° (ESE) in late December. Sunset moves from 303° (WNW) in June to 239° (WSW) in December, and the midday sun climbs to 73° in summer but only 26° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 7:00 AM | 90° E | 7:08 PM | 271° W | 49° | 12h 08m |
| June solstice (Jun 21) | 5:26 AM | 58° ENE | 8:31 PM | 303° WNW | 73° | 15h 05m |
| September equinox (Sep 22) | 6:44 AM | 89° E | 6:55 PM | 271° W | 50° | 12h 11m |
| December solstice (Dec 21) | 7:17 AM | 121° ESE | 4:33 PM | 239° WSW | 26° | 9h 15m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Lighthouses work at both ends of the day: blue hour when the beacon is lit, and golden hour when white towers take on warm tones.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:49 AM | 7:19 AM | 8:01 AM | 4:11 PM | 4:53 PM | 5:24 PM | 9h 35m |
| February | 6:23 AM | 6:51 AM | 7:29 AM | 4:53 PM | 5:31 PM | 5:59 PM | 10h 40m |
| March | 6:41 AM | 7:09 AM | 7:45 AM | 6:27 PM | 7:03 PM | 7:30 PM | 11h 54m |
| April | 5:50 AM | 6:18 AM | 6:55 AM | 6:59 PM | 7:35 PM | 8:04 PM | 13h 17m |
| May | 5:09 AM | 5:40 AM | 6:19 AM | 7:27 PM | 8:07 PM | 8:38 PM | 14h 27m |
| June | 4:52 AM | 5:25 AM | 6:06 AM | 7:48 PM | 8:30 PM | 9:03 PM | 15h 04m |
| July | 5:06 AM | 5:38 AM | 6:19 AM | 7:47 PM | 8:27 PM | 8:59 PM | 14h 49m |
| August | 5:38 AM | 6:07 AM | 6:45 AM | 7:18 PM | 7:56 PM | 8:25 PM | 13h 49m |
| September | 6:10 AM | 6:37 AM | 7:14 AM | 6:31 PM | 7:07 PM | 7:34 PM | 12h 30m |
| October | 6:40 AM | 7:08 AM | 7:45 AM | 5:40 PM | 6:17 PM | 6:45 PM | 11h 10m |
| November | 6:14 AM | 6:44 AM | 7:24 AM | 3:59 PM | 4:40 PM | 5:09 PM | 9h 56m |
| December | 6:43 AM | 7:14 AM | 7:57 AM | 3:47 PM | 4:30 PM | 5:01 PM | 9h 17m |
Local time (America/New York), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Castle William Light, the Milky Way core is visible in a dark sky from March through September. June gives the longest window (about 4.7 hours on a moonless night), and the core peaks around 20° above the southern horizon. Our light-pollution model puts the sky at about Bortle 9 (inner-city sky), so expect visible sky glow; drive away from towns for better results.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | -2° | — |
| February | 5:13 AM – 5:13 AM | 0.0 | 11° | SE → SE |
| March | 4:24 AM – 5:34 AM | 1.2 | 17° | SE → SSE |
| April | 2:24 AM – 4:34 AM | 2.2 | 20° | SE → S |
| May | 12:19 AM – 3:39 AM | 3.3 | 20° | SE → S |
| June | 10:36 PM – 3:16 AM | 4.7 | 20° | SSE → SSW |
| July | 10:27 PM – 1:47 AM | 3.3 | 20° | S → SW |
| August | 9:39 PM – 11:49 PM | 2.2 | 20° | S → SW |
| September | 8:40 PM – 9:50 PM | 1.2 | 17° | SSW → SW |
| October | 7:48 PM – 7:48 PM | 0.0 | 11° | SW → SW |
| November | Below 10° in darkness | — | -1° | — |
| December | Below 10° in darkness | — | -19° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 9 Bortle 9 — Inner-city sky. Only the Moon, planets and a few bright stars are visible. Modeled zenith brightness ≈ 17.51 mag/arcsec². Aurora needs roughly Kp 6.5+ to show low on the northern horizon here.
Weather & best season
Long-term NASA satellite data for this area show September as the clearest month (about 51% average cloud cover) and December as the cloudiest (64%). July is the warmest month and January the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 67 | 71 | 73 | 91 | 88 | 96 | 102 | 101 | 96 | 92 | 75 | 71 |
| Low °F | -2 | -3 | 0 | 24 | 33 | 44 | 52 | 53 | 43 | 28 | 14 | 6 |
| Precip. (in) | 3.1 | 3.4 | 3.9 | 3.9 | 3.8 | 4.7 | 4.5 | 4.4 | 3.8 | 4.4 | 3.6 | 4.4 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this lighthouse
- Stormy weather and crashing surf add drama; keep a safe distance from waves on rocks and piers.
- A telephoto from across a bay compresses the tower against cliffs or the moon.
- Many lighthouses are on private or Coast Guard property — check public access and opening hours.
- Moonrise or the Milky Way over the tower makes a classic night composition; plan with the azimuth tables.
- Tell someone where you're going in remote areas and carry the ten essentials.
Season: Summer brings open towers and tours; autumn and winter offer storms, fewer crowds and lower sun angles.
Suggested gear: Tripod, Telephoto lens, ND filter for smooth water, Rain cover. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Permits, drones & access
National Park Service rules. Under federal law (54 U.S.C. 100905), still photography in National Park Service areas needs a permit only when it (1) takes place where members of the public are not allowed, (2) uses models, sets or props that are not part of the location's natural or cultural resources or administrative facilities, or (3) would cause the park to incur additional administrative costs to monitor the activity. Ordinary visitor and most landscape photography needs no permit. Commercial filming rules are separate and have changed in recent years — confirm current requirements with the park before a paid shoot.
Drones: Launching, landing or operating unmanned aircraft (drones) is prohibited in National Park Service units under a 2014 Superintendent's closure (36 CFR 1.5), except where a park has issued specific written approval. Flying from outside the boundary over park land can also violate park rules and disturb wildlife.
Tides
The nearest NOAA tide prediction station is NEW YORK (The Battery), 961 m away. Low tide often reveals tide pools, wet-sand reflections and sea stacks.
Nearby photo spots
Other locations within 25 km of Castle William Light, closest first.
Lighthouse
Lake
State Park
Botanical Garden
Lighthouse
State Park
Beach
State Park
State ParkCampgrounds nearby (Recreation.gov)
- Camp Gateway - Staten Island10.8 km (6.7 mi) · reservable
- Camp Gateway- Brooklyn Ny15.8 km (9.8 mi) · reservable
- Camp Gateway - Sandy Hook27 km (17 mi) · reservable
FAQ
When is the best time to photograph Castle William Light?
What time is golden hour at Castle William Light?
Where does the sun rise and set at Castle William Light?
Can you see the Milky Way from Castle William Light?
Do you need a permit to photograph at Castle William Light?
How far is Castle William Light from Financial District?
Sources
Location data: USGS GNIS / GeoNames. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.