Mount Fuji Weather in September

 Season: Autumn
 What is the weather like in Mount Fuji in September?
Mount Fuji weather in September is generally quite mild, with the temperature rarely hot during the day and very cool at night. Although monthly average precipitation is high, it is mainly in form of light rain. The climate of the higher elevations is very cool around noon but cold most time; strong winds and dense fog may occur from time to time.

Temperature

The temperature under the Mount Fuji in September is generally very pleasant, with the average high temperature of 24 degrees Celsius (75.2 degrees Fahrenheit) and average low 15℃ (59℉). There are several days when the maximum temperatures exceed 26℃ (78.8℉), which usually occurs in the early and middle periods. In sunny weather occasionally, the highest temperature may reach around 30℃ (86℉). In the early morning and evening, it’s comfortably cool, with the minimum temperatures rarely exceeding 20℃ (68℉) or falling under 13℃ (55.4℉).

The average daytime temperature at Mount Fuji’s Fifth Station is around 14℃ (57.2℉), and the average nighttime temperature is around 5℃ (41℉), which is quite chilly. The temperature at the summit is much lower, with an average temperature of 1-7℃ (33.8-44.6℉).

High Precipitation & Humidity

With the monthly rainfall accumulation averaging 286mm, September is characterized as a month with high precipitation in Mount Fuji in early autumn. Besides, there are approximately 19 rainy days over the month. Nevertheless, you don’t need to worry too much as light rain dominates and moderate to heavy rain rarely occurs. On the mountain, thick mist accompanied by rain shower are prone to happen.

Naturally, the foothills are very humid, with monthly average humidity around 82%. The data is a bit lower in the higher elevations, around 67%.

Daylight Hours & Sunshine Hours

Sunrise time (1st-30th): 05: 18 – 05: 39
Sunset time (1st-30th): 18: 14 – 17: 32

The daylight duration ranges from 13 hours at the beginning of September to 12 hours at the end. Therefore, if you visit Mount Fuji in late September, your itinerary may be a bit rushed. 

There are an average of 7 sunny days, and the average sunshine time per day is about 7 hours.

Is Mount Fuji Worth Visiting in September?

It depends on your intentions. If you are coming for a clear view of the Mount Fuji, the chances are limited. Due to frequent rainy and overcast weather, visibility in September is generally poor, especially in the early mornings when the fog surrounding Mount Fuji can be extremely thick, severely obscuring the mountain. Furthermore, the chance of watching snow cover on the mountain is very slim.

However, if you’re planning a summit climb for your 2026 trip to Mount Fuji, September is the time worth a visit. As it is close to the end of the climbing season this month, climbers decrease significantly, contributing to smooth reservations of accommodations. However, you need to keep a close eye to the weather conditions on Mount Fuji and avoid ascending in the day with heavy rain or strong winds.

What to Pack for Mount Fuji Trip in September?

 Clothing
Summer clothes like the dress, or short-sleeved shirt together with shorts are suitable most time. But on sunny days, it is best to wear sun-proof clothing, or a thin long-sleeved shirt and long pants because the UV rays are very strong, far exceeding the average index of 4.

For visitors who want to climb the mountain, climbing suit like 3-in-1 jacket plus climbing trousers are necessary. Besides, you are recommended to wear quick-drying inner layers for physical comfort.

 Footwear
Summer shoes such as casual sneakers and canvas shoes are comfortable for walking. Remember to pack some water-proof shoe covers in case you encounter rainy weather. Professional climbing shoes are needed for hikers.

 Others

Umbrella and raincoat are indispensable. Sun protections items such as the parasol, sun hat, sunglasses and sunscreen are equally important particularly on the mountain where the UV rays are severely strong on clear days. What’s more, climbers need to bring extra items like the trekking pole and oxygen supply or relevant medicine to prevent altitude sickness; if you are going to spend night time on the mountain, head lights are necessary.

Travel Advice & Tips

 After climbing, climbers are undoubtedly exhausted, so it’s recommended to relax in a hot spring. You can go to many places near the foot of Mount Fuji, such as the Lake Kawaguchi where both indoor and outdoor hot springs are available. 

 With its vast and breathtaking scenery, Mount Fuji’s surroundings offer a truly captivating outdoor experience. However, if rain is expected, it’s best to plan your itinerary accordingly. Besides enjoying meals at nearby restaurants, you can also visit some indoor attractions like the Mount Fuji Museum to learn about the history of this iconic mountain or the Kawaguchiko Music Forest Museum to enjoy musical art performances; the Mount Fuji World Heritage Center is also a good place where fascinating displays of nature and culture are exhibited. Remember to check their operating hours and public transportation schedules in advance in case you miss them at wrong time.

Mount Fuji Weather by Month