TONIGHT · Fri, Sep 25More reliable forecast
36/100Challenging37% cloud in best window · Full Moon (99% illuminated)
Astronomical dusk: 7:00 PM GMT+9
Best 3-hour window: 7 PM–10 PM GMT+9
UPDATED HOURLY
Is Tonight Good for Stargazing in Tokyo?
Tonight’s observing conditions and the next seven-night outlook for Tokyo, Japan.
Updated · Time zone: Asia/Tokyo.
TONIGHT · Fri, Sep 25
Tokyo
36/100
Challenging conditions for stargazing
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 7 PM–10 PM GMT+9, with 37% forecast cloud and 99% illuminated.
Based on the strongest continuous three-hour combination of hourly cloud, visibility and humidity after astronomical dusk.
THIS WEEK
What is the best night for stargazing in Tokyo this week?
Thu, Oct 1 is currently the strongest option in the next seven nights at 71/100, compared with tonight at 36/100. Check again before leaving.
NEXT 7 NIGHTS
Choose a better night to observe
Best upcoming night: Thu, Oct 1 · 71/100
Sat, Sep 26More reliable forecast
19/100Poor66% cloud in best window · Full Moon (100% illuminated)
Astronomical dusk: 6:58 PM GMT+9
Best 3-hour window: 2 AM–5 AM GMT+9
Sun, Sep 27More reliable forecast
43/100Challenging18% cloud in best window · Full Moon (99% illuminated)
Astronomical dusk: 6:57 PM GMT+9
Best 3-hour window: 8 PM–11 PM GMT+9
Mon, Sep 28Forecast may change
1/100Poor96% nightly average cloud · Waning Gibbous (96% illuminated)
Astronomical dusk: 6:55 PM GMT+9
Trend only — check again closer to the date.
Tue, Sep 29Forecast may change
1/100Poor99% nightly average cloud · Waning Gibbous (91% illuminated)
Astronomical dusk: 6:54 PM GMT+9
Trend only — check again closer to the date.
Wed, Sep 30Check again closer to the date
31/100Poor63% nightly average cloud · Waning Gibbous (84% illuminated)
Astronomical dusk: 6:52 PM GMT+9
Trend only — check again closer to the date.
Thu, Oct 1Check again closer to the date
71/100Fair14% nightly average cloud · Waning Gibbous (75% illuminated)
Astronomical dusk: 6:51 PM GMT+9
Trend only — check again closer to the date.
The first three nights include hourly detail. Days 4–7 are more likely to change, so check again before travelling.
99% illuminated · check local moonrise and moonset
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 24.0 μg/m³ · AOD 0.43
Optics dew indicator
7Timer ASTRO model
Local time
Higher values may reduce transparency
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: Treat this as an event-based recommendation. Confirm the park’s latest event notice and nighttime access before visiting.
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.
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: Best used during an announced observing event. Ordinary nights are bright and may not offer the same lighting or access arrangement.
Official information reviewed August 20, 2026. Always confirm current access, weather, transport and local safety conditions before leaving.
The displayed server snapshot is cached for up to one hour.
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.