The Sky Above Tokyo

Tokyo has 23 wards but only 5 places where you can still see the horizon. The rest is a maze of buildings, overhead wires, narrow streets, and the constant hum of 14 million people going about their lives. But the sky is still there. It is above every rooftop, every train line, every convenience store. And if you know where to look, it opens up in ways that will stop you mid-step.

We built JP Weather Sky because we kept getting asked the same questions. Where can I watch the sunset without a building in the way? Is there anywhere in Tokyo to see stars? What kind of clouds are those? So we started mapping the sky. Not the weather — the sky itself. The view factor. The angles. The places where clouds roll in unobstructed and where they break apart against a wall of glass and steel.

Every day we pull live cloud cover data from the Open-Meteo API for five locations across Tokyo. The bubbles above show what the sky looks like right now. Each circle grows or shrinks based on the current cloud percentage. Blue means clear. Steel gray means overcast. The size tells you how thick the cover is. It is not a forecast. It is a snapshot of the atmosphere at this moment.

Odaiba gives you 270 degrees of open sky. You stand on the beach and look south across the bay and there is nothing. No buildings, no wires, no elevated highways. Just water and sky. The clouds come in low over the bay in summer, piling up into cumulus towers that reflect in the shallows. In winter the sky is a thin pale blue, almost white, and you can see Mt. Fuji on clear days — not the mountain itself framing the sky, but the way the sky bends around it.

Mt. Takao is different. At 599 meters you are above the city's cloud layer half the time. The clouds that blanket Shinjuku are below you, a soft gray sea with islands of towers poking through. You see altocumulus patterns that are invisible from the streets. The wind is different up there. It comes in clean from the west, undisturbed by heat islands, and the cumulus humilis over the Tama valley look like a child's drawing — neat little cotton balls in a row.

Yoyogi Park is the largest green sky gap in central Tokyo. The trees frame the view instead of buildings. You lie on the grass and look up through the canopy and the patches of blue move like slow rivers between the leaves. It is the only place in Shibuya where you can see a cumulonimbus top without craning your neck. The park swallows sound. The city is 200 meters away but you would not know it. Just wind in the zelkova branches and the sky.

Toyosu faces east. It is the place to watch the sunrise. The new developments are narrowing the gaps — towers going up where there used to be open wharf — but for now, the eastern sky is still largely unobstructed. The dawn comes up over the bay in bands of color: indigo, then violet, then a thin line of molten gold that thickens into orange. The fish market starts its day in the dark, and by the time the sun clears the horizon the auction floors are already busy.

Shinjuku Southern Terrace is the opposite. It is a canyon sky. You get maybe 40 degrees of visible arc, framed by the NEC Tower and the Odakyu building on one side and the rail tracks on the other. But those 40 degrees can be spectacular. A sunset-aligned cumulus, lit from below in pink and gold, moving fast between the towers. A sliver of cirrus catching the last light. You learn to watch the small windows. The narrow openings reward patience.

Current Sky Conditions

Why We Watch the Sky

There is a tendency to think of the sky as background. It is what is left over when you have mapped everything else. But that is backwards. The sky is the main event. It is the largest visible surface on Earth, the only part of the natural world that remains accessible to everyone in a city of this density. You do not need a ticket. You do not need equipment. You just need to look up at the right angle, from the right place, at the right time.

We are not meteorologists. We are observers. Hana Suzuki, our founder, has photographed the Tokyo sky from five fixed locations every day for three years. That is 5,475 sky photographs. She has documented 14 distinct cloud types, 3 Brocken spectres from Mt. Takao, 2 green flash attempts at Odaiba (no success yet), and one noctilucent cloud sighting that she still cannot fully explain. David Park, our co-founder, mapped light pollution across all 23 wards by bicycle, carrying a Sky Quality Meter, riding 400 kilometers over six months. Yuki Mori, our meteorology student contributor, writes the cloud identification guides that help you name what you are seeing.

This site will not tell you if it is going to rain. There are a thousand apps for that. What we offer is different. We tell you where the sky opens. Where the clouds are worth watching. Where the sunset will paint the buildings gold and where the stars still shine through the sodium glare. We tell you what you are looking at when you look up. And we remind you, in a city this crowded, that there is still infinity above your head.

The data updates every hour. The locations do not change. The sky is always different. Start with the sky view profiles to understand how much horizon each district gives you. Move to the sunset spots if you want to catch the golden hour. Read the cloud atlas to learn the difference between a cumulus humilis and a stratocumulus. And if you are up late, check the stargazing guide — because even in Tokyo, Orion's belt is there, every clear winter night, between the buildings.