Tokyo’s skyglow is intense, so Okutama, Bōsō, and Izu dark sites define real deep-sky nights. Winter Siberian highs deliver the sharpest transparency of the year.
Baiu rainy season often erases June–July observing windows.
Japan · Kantō · ~35.7°N
Plan tonight in Tokyo
Read the live Tonight score from cloud, dew, transparency, and astronomical dark.
Use the hourly cloud timing chart to pick the clearest stretch of night.
Align with the moonless dark window (moonrise, moonset, illumination).
Check the next ISS pass, then open a tool with coordinates prefilled.
FAQ
Is tonight good for stargazing in Tokyo?
Check the live Tonight score for Tokyo (cloud, dew, transparency, and astronomical dark), then read the hourly cloud timing chart and moonless dark window on this page.
What is the best time to stargaze tonight?
Use the best clear window clock times after astronomical darkness, and prefer moonless hours when deep-sky contrast matters.
When is the moon window in Tokyo?
This hub shows moonrise, moonset, illumination, and the longest moonless astronomical-dark interval for Tokyo. Open Dark Sky Window for the full ephemeris card.
When can I see the ISS from Tokyo?
ISS passes are spottable near dusk or dawn when the sky is dark and the station is still sunlit. This page lists the next spottable pass when available.