Mount Fuji records about 2435mm of rain across roughly 115 wet days a year, which is a 32% chance on an average day. September is the wettest month at 220mm (9% of the annual total) and December the driest at 50mm. Local rain type: monsoon. Mount Fuji's official climbing season (July-September) coincides with the wettest months — weather windows must be carefully timed for summit attempts.
Chance of rain on an average day: 32%
Rainfall climatology for Mount Fuji. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 2435mm |
| Rain days per year | 115 |
| Odds on an average day | 32% |
| Wettest month | September — 220mm over 16 days |
| Driest month | December — 50mm over 4 days |
| Rain type | monsoon |
| Best dry window | Clear winter days offer the best photography from Lake Kawaguchiko. Climbing is July-September only. |
| Worst rain window | July through September brings both climbing season and peak rainfall. |
September delivers 340% more rain than December (220mm vs 50mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 9% of the annual total, so rain in Mount Fuji is spread through the year — there is no season you can rely on being dry.
Mount Fuji rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 16 days in September against 4 in December — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 82mm | 6 | 20% | 5°C |
| February | 75mm | 5 | 17% | 5°C |
| March | 135mm | 10 | 33% | 8°C |
| April | 118mm | 8 | 27% | 13°C |
| May | 138mm | 10 | 33% | 18°C |
| June | 168mm | 12 | 40% | 23°C |
| July | 195mm | 14 | 47% | 26°C |
| August | 178mm | 13 | 43% | 26°C |
| September | 220mm | 16 | 53% | 23°C |
| October | 175mm | 12 | 40% | 18°C |
| November | 82mm | 6 | 20% | 13°C |
| December | 50mm | 4 | 13% | 8°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Mount Fuji we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Mount Fuji records rain on roughly 115 days a year — about a 32% chance on any given day — totalling around 2435mm.
September, with about 220mm over 16 rain days. That is 9% of the entire year's rainfall in a single month.
December is the driest month at 50mm across roughly 4 days. Clear winter days offer the best photography from Lake Kawaguchiko. Climbing is July-September only.
Mount Fuji's official climbing season (July-September) coincides with the wettest months — weather windows must be carefully timed for summit attempts.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.