Tokyo Microclimate Map
Live temperature readings from eight wards. Colors update every forecast cycle.
Why Tokyo Has 23 Microclimates
Tokyo doesn't have one weather. It has dozens. On a July afternoon, the thermometer outside Shinjuku Station reads 34°C. Cycle thirty minutes west to Komazawa Park in Setagaya and you'll find 30°C. That's not a rounding error. That's a real difference you can feel on your skin, and it's the reason we built Fuji Skyline.
The Kanto Plain sits like a shallow bowl, open to the Pacific on the east and hemmed by mountains to the west. Tokyo Bay breathes cool, moist air into the city on summer afternoons. The Tama River valley channels breezes from the southwest. The Sumida River cuts a north-south corridor that moves air through the eastern wards. And the dense concrete cores of Shinjuku, Shibuya, and Ikebukuro trap heat like a skillet.
We've chosen eight representative wards from across the 23 special wards of Tokyo. Each has distinct geography, building density, and exposure to wind and water. The map above shows live temperature data from each ward, updated from the Open-Meteo forecast API. Click any ward dot to read a detailed microclimate analysis.
Current Conditions by Ward
| Ward | Temperature | Humidity | Feels Like |
|---|---|---|---|
| Loading data from Open-Meteo... | |||
The Geography Behind the Numbers
Tokyo occupies roughly 2,194 square kilometers of the Kanto Plain, but the 23 special wards pack 9.3 million people into just 627 square kilometers. That density isn't uniform. Shinjuku's skyscraper district has a floor area ratio exceeding 1,000% in some zones. Setagaya, by contrast, is the most populous ward but spreads 943,000 residents across a wide residential canvas with abundant tree cover.
The Kanto Basin Effect
The city sits at the bottom of a topographic bowl. Mountains ring the western edge — the Tama Hills to the southwest, the Sayama Hills to the northwest, and the foothills of Saitama to the north. On calm summer nights, cool air drains downhill and pools in low-lying areas. Taito, at roughly 5 meters above sea level near Asakusa, experiences this drainage more than Setagaya at 30-40 meters. The result: Taito can feel muggy and still at 6am while Setagaya catches the first downslope breeze.
Tokyo Bay's Moderating Hand
The bay is Tokyo's air conditioner. Sea surface temperatures in August hover around 26°C, cooler than the concrete surface temperature of 40-50°C. When the sun heats the land, a pressure gradient forms. Air flows from bay to land between roughly 11am and 5pm. Wards with direct bay exposure — Minato, Shinagawa, Chuo — feel this sea breeze first. On strong onshore days, you can stand at Hama-rikyu Gardens and feel the temperature drop 2-3 degrees compared to Nihonbashi, just two kilometers inland.
River Corridors as Wind Tunnels
The Sumida River, Arakawa River, and Tama River all create linear open spaces that channel wind. The Sumida River path is particularly effective. It runs north-south through Taito and Sumida wards, and on days with a southerly component, you can ride a bicycle from Asakusa to Kinshicho with a steady tailwind. The river's cooling effect extends roughly 200-400 meters on either bank. Walk from Senso-ji Temple toward Tokyo Skytree and you'll feel the humidity shift as you leave the river corridor.
The Heat Island: Concrete vs. Green
Tokyo's urban heat island peaks at night. Research by the Tokyo Metropolitan Government shows temperature differences of 4-7°C between the city center and surrounding rural areas. Within the 23 wards, the gap is narrower but still significant. Shinjuku's west exit, packed with department stores and bus terminals, runs 2-3°C hotter at midnight than nearby Shinjuku Gyoen National Garden. The park's 58.3 hectares of trees and lawn act as a cool island, with evapotranspiration lowering the effective temperature.
Building Canyons and Wind Tunnels
Skyscrapers don't just trap heat. They redirect wind. Meiji-dori, the broad avenue cutting through Shibuya, becomes a wind tunnel on breezy days. Gusts between buildings can reach 3-5 m/s at street level, enough to knock over a bicycle if you're not paying attention. Roppongi Hills creates a noticeable downdraft on its north side. The Toranomon Hills tower similarly accelerates wind along Sakurada-dori. These aren't random occurrences. They're predictable microclimate features that cyclists and delivery riders learn by experience.
Why Microclimates Matter
If you're a runner planning a morning loop, you want to know where the cool pockets are. If you're a cyclist delivering ramen across the city, you want to avoid the wind tunnels and heat zones. If you're a construction worker on a high-rise site, the ward-level forecast isn't precise enough — the temperature at ground level in Shiodome can differ from the 20th floor by several degrees. And if you live in one of Tokyo's many neighborhoods without air conditioning, knowing when the bay breeze will reach your ward is genuinely useful.
We've built Fuji Skyline because we couldn't find a weather service that treated Tokyo's neighborhood-level variation seriously. Most forecasts give you one number for "Tokyo." But Tokyo isn't one place. It's 23 wards, hundreds of neighborhoods, and thousands of microclimates. This map is our attempt to make that visible.