Is Mt. Fuji Visible Today? How to Read the 1

Quick answer

Go in the morning, trust a 7+ index, and always confirm with a live camera before you travel. Mt. Fuji is a 3,776 m mountain that generates and traps its own weather; even a "sunny" forecast for the Fuji Five Lakes can come with a cloud cap sitting exactly on the summit. A visibility index plus a live camera is the difference between a postcard morning and a two-hour ride to see a grey wall.

What the 1–10 index actually is (and is not)

FujiVis displays a 1–10 visibility index for the north side (Kawaguchiko / Fuji Five Lakes) and the south side (Fujinomiya / Hakone direction), split into morning (AM) and afternoon (PM). Be clear about what you are looking at:

The index comes from a third-party Japanese meteorological forecast service (tenkura, operated by the Japan Weather Association), updated once per day, around 16:30 Japan time. FujiVis re-presents these values on its own scale and layout.
It is a forecast, not an observation. Nobody has measured today's visibility in advance; the score expresses how visible the mountain is expected to be.
Rough guide: 8–10 means the silhouette should be essentially clear; 6–7 means visible but partly veiled; 4–5 means mostly hidden; 1–3 means barely or not at all visible.
Because the update is daily, a sudden change of weather (a front arriving overnight, summer thunderstorms) can make the morning's score stale. That is exactly why the live-camera check exists.

What 87 days of archived data show

FujiVis publishes a daily archive of these index values as an open dataset on GitHub (see sources). Between June 16 and September 10, 2026 — 87 consecutive days — the archived numbers for the north side look like this:

Mornings scored 7+ on 25 of 87 days (29%); afternoons only 10 of 87 (11%).
The average morning score was about 4.0 versus about 2.4 in the afternoon.
Clear spells come in runs: six consecutive good mornings (July 9–14), then five more (August 24–28), with long poor stretches in between.

Important caveat, in the archive's own words: these are forecast values as published, not ground-truth observations. They tell you how visible the mountain was expected to be, which is still useful — the morning-vs-afternoon gap and the run-like pattern are exactly what locals know anecdotally.

Why mornings beat afternoons

Convection: on warm days the sun heats the slopes, air rises, and cumulus clouds pile up around the summit through the afternoon. This is the single biggest visibility killer in summer and early autumn.
Cap cloud: humid air lifted over the 3,776 m massif condenses into a "hat" (kasa-gumo) that can sit on the summit while the sky around it stays blue.
Haze: afternoons in the Kanto plain tend to be hazier, which matters when you are looking from 20–100 km away.

Season by season: when the odds shift

December–February: the best season. The winter monsoon blows dry Pacific-side air, haze collapses, and the snowcapped silhouette is at its sharpest. Mornings after a cold front are the premium slots of the whole year.
March–April: changeable. Clear, cold mornings alternate with spring pressure systems; the mountain is often visible early and gone by noon.
June–mid July: the rainy season (tsuyu) is the worst window of the year — stationary fronts mean days of flat grey cloud. Plan Fuji activities as opportunistic, not scheduled.
Late July–August: hot and convective. Early mornings remain workable; afternoons regularly generate both summit cloud and distant haze. This is also climbing season, when a clear pre-dawn summit matters most.
September–November: recovering and then excellent. Early autumn still carries typhoon-season volatility (check official warnings before mountain-area travel), while late October–November combines crisp air with foliage colors around the lakes.

North side or south side?

The two indices are not interchangeable — they describe different viewing geographies. North side means the Yamanashi view: the Fuji Five Lakes, Kawaguchiko, Fujiyoshida and the Chureito Pagoda area. South side means the Shizuoka view: Fujinomiya, Gotemba, the Fuji River corridor and the Hakone hills looking west. The two sides sit under different air masses often enough that a 4-vs-8 split between them on the same day is routine. Match the side you check to where you will physically stand, or you are reading the wrong forecast.

What to do when the score says "don't bother"

A low-index day around the mountain is not a wasted trip — the region is built for exactly this:

Saiko's lava caves (Fugaku Wind Cave, Narusawa Ice Cave) are underground and weather-proof, and stay near-freezing even in August.
Kimono, museums and aquarium: Kawaguchiko's museums, the Fujiyoshida Sengen Shrine and its ancient cedar avenue, and Oshino Hakkai's ponds all survive cloud.
Onsen: a rainy lake-view bath at a Kawaguchiko onsen ryokan is the region's fallback institution for a reason.
Re-check at ~16:30 JST: the daily index update tells you whether tomorrow morning is your shot — often the difference between a written-off day and a scheduled 4:30 a.m. alarm.

A practical decision framework

Index 7–10 (morning): go, and go early. This is the window worth a pre-dawn alarm.
Index 5–6: marginal. Fine if you are already in the area; not worth a long detour.
Index 1–4: plan something else and re-check the next day's update at ~16:30 JST.
Always, regardless of score: look at the live cameras 30–60 minutes before you leave. Cameras are ground truth; the index is a forecast.

How to use the FujiVis pages together

The visibility page gives you the multi-day forecast for both sides of the mountain, which is what you need when you still have flexibility in your itinerary — you can see whether tomorrow morning is worth switching your lake day with your Tokyo day. The today view answers the immediate question, and the cameras close the loop. If a camera at Kawaguchiko shows the mountain sharply while the index says 6, believe the camera.

FAQ

The index said 8 but the summit was capped when I arrived. Why?

Because it is a forecast updated once daily, and cap cloud can form on hour-scale timing. The index improves your odds; it does not remove weather. Check the cameras on the morning itself.

Does a 10 mean guaranteed visibility?

No score is a guarantee. A 10 means the forecast expected a completely clear silhouette — historically the most reliable signal in the scale, but still a forecast.

How often is the index updated?

Once a day, around 16:30 JST, when the upstream forecast service publishes. There is no intraday recalculation.

Which side should I check — north or south?

Match the side to where you will actually stand: north = Kawaguchiko, the Five Lakes, Yamanakako; south = Fujinomiya, Gotemba, Hakone. The two sides regularly differ by several points on the same day.

Is winter better than summer?

On average, yes — the winter monsoon brings dry, clear Pacific-side air, and summer afternoons in particular are cloud-prone. But winter also means short days and icy roads, so plan around the mornings either way.

Sources

Written by the VoyBird Team. FujiVis is a third-party reference tool built on public meteorological data — not an official forecast service. See our about page for our data policy and limitations.

Is Mt. Fuji Visible Today? How to Read the 1–10 Visibility Index