TONIGHT · Mon, Nov 9More reliable forecast
51/100Challenging77% cloud in best window · New Moon (0% illuminated)
Astronomical dusk: 6:06 PM GMT+9
Best 3-hour window: 1 AM–4 AM GMT+9
UPDATED HOURLY
Is Tonight Good for Stargazing in Tokyo?
Tonight’s observing conditions and the next seven-night outlook for Tokyo, Japan.
TONIGHT · Mon, Nov 9
Tokyo
51/100
Challenging conditions for stargazing
Observing night: evening → morning · Asia/Tokyo
Window dates: Nov 10, 2026 01:00 → Nov 10, 2026 04:00
Tonight means the evening of the first date through the following morning, in the city’s time zone—not the night that just ended.
Updated · Time zone: Asia/Tokyo.
The server snapshot is cached for up to one hour.
The score includes forecast sky conditions and a Moon-phase proxy after astronomical dusk. Moonrise, local light pollution and site access are not scored; bright planets and faint deep-sky targets have different requirements.
Is tonight good for stargazing? Challenging. The strongest three-hour window is 1 AM–4 AM GMT+9, with 77% forecast cloud and 0% illuminated.
Based on the strongest continuous three-hour combination of hourly cloud, visibility and humidity after astronomical dusk.
Tonight, hour by hour
One-hour forecast intervals within astronomical darkness. Highlighted rows are the exact three hours used for tonight’s score. Scores are rounded; their average is rounded again.
Compare the hours
Lines use the same values as the table. Gaps mean unknown data; cloud layers overlap and are not added. The shaded band marks the existing best three-hour window, where available. Asia/Tokyo
- Total cloud
- Low cloud
- Middle cloud
- High cloud
Selected hour: 2026-11-09 19:00
Total cloud: 84% · Low cloud: 84% · Middle cloud: 60% · High cloud: 35%
| Local date / time | Score | Cloud |
|---|---|---|
| Other dark hour | 41/100 | 84% |
| Other dark hour | 35/100 | 90% |
| Other dark hour | 35/100 | 90% |
| Other dark hour | 39/100 | 84% |
| Other dark hour | 46/100 | 73% |
| Other dark hour | 56/100 | 60% |
| Best window | 45/100 | 79% |
| Best window | 48/100 | 82% |
| Best window | 61/100 | 71% |
Why this score?
Largest modeled deductions in the selected window—not a visibility guarantee.
- Clouds: 77% total and 21% high cloud on average.
THIS WEEK
What is the best night for stargazing in Tokyo this week?
Wed, Nov 11 has the strongest whole-night average in this seven-night outlook. Its best three-hour window scores 100/100; tonight’s best three-hour window scores 51/100. Check again before leaving.
Whole-night averages
Tonight 45/100 · recommended night Nov 11, 2026: 100/100. This ranking uses all scored dark hours, not each card’s best three hours. Later-night values are indicative, not precise hourly forecasts.
NEXT 7 NIGHTS
Choose a better night to observe
Best upcoming night: Wed, Nov 11 · 100/100
Tue, Nov 10More reliable forecast
100/100Promising3% cloud in best window · New Moon (0% illuminated)
Astronomical dusk: 6:06 PM GMT+9
Best 3-hour window: 8 PM–11 PM GMT+9
Wed, Nov 11More reliable forecast
100/100Promising0% cloud in best window · Waxing Crescent (3% illuminated)
Astronomical dusk: 6:05 PM GMT+9
Best 3-hour window: 7 PM–10 PM GMT+9
Thu, Nov 12Forecast may change
TrendFair57% nightly average cloud · Waxing Crescent (7% illuminated)
Astronomical dusk: 6:04 PM GMT+9
Indicative only — check again closer to the date.
Fri, Nov 13Forecast may change
TrendPromising17% nightly average cloud · Waxing Crescent (14% illuminated)
Astronomical dusk: 6:04 PM GMT+9
Indicative only — check again closer to the date.
Sat, Nov 14Check again closer to the date
TrendPoor99% nightly average cloud · Waxing Crescent (22% illuminated)
Astronomical dusk: 6:03 PM GMT+9
Indicative only — check again closer to the date.
Sun, Nov 15Check again closer to the date
TrendFair51% nightly average cloud · Waxing Crescent (31% illuminated)
Astronomical dusk: 6:03 PM GMT+9
Indicative only — check again closer to the date.
Best-night ranking compares each whole-night average. The first three cards display the best three-hour score; days 4–7 show only an indicative trend. Check again before travelling.
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0% illuminated · Check Moon phase and planning
Same three-hour window as the score
Local time
Current surface visibility
CURRENT SNAPSHOT, LAYER BY LAYER
Professional observing conditions
These are current forecast fields; the tonight score above uses the best three-hour window. Compare both with local conditions before travelling.
Near-surface layer
Middle atmosphere
Thin cloud can spread skyglow
PM2.5 16.1 μg/m³ · AOD 0.15
Optics dew indicator
7Timer ASTRO model
Local time
Higher values may reduce transparency
Aurora visibility tonight
Choose a location to load NOAA activity and local conditions.
What this forecast means in Tokyo
Tokyo’s bright urban sky and humid air often limit faint deep-sky contrast. Clear nights can still suit the Moon, planets and bright constellations; for fainter targets, pay particular attention to transparency, high cloud and direct local lighting.
HUMAN-REVIEWED OPTIONS
Where to try stargazing near Tokyo
These are planning candidates, not guarantees of darkness, safety or nighttime access. A site may close before the forecast’s best window; compare its posted hours with the recommended time.
Chofu · west Tokyo
Musashino-no-mori Park
Good for: Beginner sessions, Moon and bright planets
Its large lawn and open view across Chofu Airport have been used for official seasonal stargazing events.
Before you go: The park lists general access as always open, but its north–south Promenade connector is only open 9:00–16:30. No upcoming observing session is verified here. Check facility closures and use a legal entrance; the January 11 event has ended.
Information checked: 2026-10-31
Kita / Itabashi · north Tokyo
Ukima Park
Good for: Community telescope sessions and bright targets
The open sky above the central pond supports a recurring volunteer-led public observing program.
Before you go: City light remains strong and event arrangements change. Check the official park news rather than assuming telescopes are present nightly.
Information checked: 2026-10-31
Central Tokyo
Hibiya Park lawn
Good for: Moon, Jupiter and bright constellations
An easy central option with an open lawn; the park has held official sessions with temporary light reduction.
Before you go: The January 25 observing session has ended. The park lists lighting around Shinji Pond (心字池) from November 12 to December 20, 2026, and Hibiya Art Park on and around the lawns from November 13 to 29 (Japan time). Do not count on dark conditions. The December 19–20 park programme mentions a stargazing session but has not published its specific schedule. The October 25–29 partial access and reed-cutting notices are historical; their dates do not confirm reopening. Check the park notices and on-site guidance for event details and ordinary nighttime access before travel.
Information checked: 2026-11-04
Review dates are shown per option. Confirm current access, weather, transport and local safety before leaving.
Find a darker place to observe
Search your destination on a light-pollution map, or browse certified Dark Sky Places. These are external planning resources, not additional live forecast data.
A dark map color does not guarantee clear skies, legal nighttime access or safety. Check the map layer and date, then confirm opening hours, permits, transport and local conditions with the site's operator. These links do not send your coordinates automatically.
Sources and accuracy note
This forecast combines public model data with local astronomical calculations. Missing upstream fields are shown honestly rather than estimated without support.