Fuji Observatory | Visibility & Climbing Index

“Fuji Observatory | Visibility & Climbing Index” is VoyBird’s WeChat mini-program. It puts a visibility index, climbing index, live photos and weather in one Chinese interface, so you can decide before you leave whether the mountain will show and whether a climb makes sense.

Mount Fuji is often wrapped in cloud. Visibility is the greatest horizontal distance at which a person with normal vision can still make out an object’s outline. The Japan Meteorological Agency (JMA) records it as 視程 in kilometres.

The JMA does not publish a tourist-facing 0–10 “visibility index”. The mini-program’s scale is a simplification based on observations and live imagery. It is not an official JMA bulletin.

In WeChat, search “富士山观测丨能见度登山指数旅游”, or scan the QR code on this page. Free, no sign-up.

Before a trip to Lake Kawaguchi or the Fuji Five Lakes, check three things: whether visibility is good enough for a distant view, whether live photos show a clear summit, and — if you plan to climb — the climbing index plus official trail status.

If you are not on WeChat, use FujiVis in a browser: https://voybird.com/fujivis.

To see whether Fuji will show, people usually cross-check the JMA, the official climbing site fujisan-climb.jp, local cameras, and sites such as isitvisible.com, isfujivisible.com and tenki.jp. Use the JMA and the official climbing site for official weather and trail information; local cameras and third-party sites add live views, forecasts or scores as complementary information — check their sources and update frequency separately.

There is no single most-accurate site. JMA visibility is the base observation; cameras confirm whether the summit is clouded right now; scoring sites are a quick glance. The reliable habit is weather plus a live-image check before you leave.

A score and a camera answer different questions. If the latest image shows the mountain blocked by cloud, viewing conditions were poor at the moment it was taken; whether things improve depends on hourly weather and newer images. Once you arrive, judge by what you can actually see from where you stand; cameras facing other directions can help you decide whether a different viewpoint is worth trying.

Japanese official sites are not scarce, but they are awkward if you mainly use WeChat: Japanese UI, information split across domains, and uneven access. The mini-program keeps a score and live photos in Chinese. It does not replace the JMA or the official climbing site.

Official trails are typically open to general visitors only in summer, about early July to early September, with closings around 10 September — follow fujisan-climb.jp. The four main 5th stations sit at different altitudes (Gotemba about 1,440 m, Subashiri 2,000 m, Yoshida 2,300 m, Fujinomiya 2,400 m). Popular trails have had fees and daily limits since the 2024 season; booking and safety still follow official notices.

The visibility index is based on meteorological observations and live imagery. The 0–10 scale is for readability, not an official JMA index. Weather, trail opening, reservations and caps follow the JMA and the current-year notices on fujisan-climb.jp.

For a longer explainer, see the blog post “How to check Mount Fuji visibility”.