How Our Mt Fuji Visibility Forecast Works | Methodology                                                           [ Home ](https://isfujivisible.com) | [ Weather ](https://isfujivisible.com/mt-fuji-weather) | [ Live Cams ](https://isfujivisible.com/mt-fuji-live-cams) | [ Viewspots ](https://isfujivisible.com/viewspots) | [ Sakura ](https://isfujivisible.com/sakura) | [ Koyo ](https://isfujivisible.com/koyo) | [ Plan ](https://isfujivisible.com/plan-your-trip) | [ Stats ](https://isfujivisible.com/visibility-by-month/2026) | [ Blog ](https://isfujivisible.com/blog) 

How Our Visibility Forecast Works
=================================

This page explains how the Mt. Fuji visibility forecast on isfujivisible.com is produced: what the score means, why we forecast the two sides of the mountain separately, where the data comes from, and how often everything updates.

  The 1-10 visibility score
-------------------------

Every forecast is expressed as a score from 1 to 10. The score estimates how clearly Mt. Fuji can be seen from a given side of the mountain during a given part of the day. It is a measure of expected view quality, not a probability.

 | Score | Level | What you can expect |
|---|---|---|
| 8-10 | Visible | Clear, sharp views of the full mountain. Great conditions for photos. |
| 6-7 | Partially Visible | The mountain is recognizable but softened by haze or partly covered by clouds. |
| 3-5 | Barely Visible | Only faint outlines or brief glimpses, usually through gaps in clouds. |
| 0-2 | Not Visible | The mountain is hidden behind clouds, rain, or thick haze. |

  Why North and South are forecast separately
-------------------------------------------

Mt. Fuji sits between two distinct weather zones. The north side covers Kawaguchiko, Yamanakako, and the rest of the Fuji Five Lakes region. The south side covers Hakone, Lake Ashi, Gotemba, and the Suruga Bay coastline. Clouds frequently sit on one flank of the mountain while the other side is clear, so a single visibility number would mislead anyone standing at the wrong viewpoint. Each side gets its own independent forecast.

  Why mornings and afternoons are forecast separately
---------------------------------------------------

Visibility around Mt. Fuji follows a strong daily cycle. Mornings are usually the clearest window because the air is cool and stable. Through the day, warming slopes push moist air upward and convective clouds and haze build around the summit, so afternoons are often worse even on generally clear days. Each day therefore carries two scores, one for the morning and one for the afternoon.

  Data sources and model
----------------------

Weather inputs such as cloud cover, humidity, wind, and precipitation come from Yr.no, the forecast service of the Norwegian Meteorological Institute. Visibility scores combine these weather inputs with visibility prediction models and historical viewing patterns around the mountain.

Forecasts cover 10 days ahead. Like every weather-driven prediction, they become more reliable as the date approaches, so a score for tomorrow carries more weight than a score nine days out. Treat the far end of the forecast as guidance for planning, not as a promise.

  Update schedule
---------------

A new 10-day forecast is published once daily around 4:00 PM JST. Our [live cameras](https://isfujivisible.com/mt-fuji-live-cams) stream continuously, so you can verify the current view in real time at any moment.

  Checking our track record
-------------------------

We archive our daily scores and publish them as monthly statistics. You can see how often Mt. Fuji was visible in any recorded month on the [visibility by month](https://isfujivisible.com/visibility-by-month/2026) page.

  What makes this forecast different
----------------------------------

- Two viewpoints: separate forecasts for the North (Kawaguchiko) and South (Hakone) sides of the mountain.
- Two periods per day: independent morning and afternoon scores for each of the 10 forecast days.
- 16 live cameras around the mountain to verify conditions in real time.
- A public archive of past visibility scores, published month by month.
- Available in 15 languages.
- Built and maintained by a real person. Read more in the [about section](https://isfujivisible.com#about).