Mount Fuji Weather in August

 Season: Summer
 What is the weather like in Mount Fuji in August?
The weather of Mount Fuji in August is the hottest throughout the year, but it’s bearable generally. Although the top of the mountain still features low temperatures, it’s already suitable for climbing. Precipitation is frequent and intermittently over the month.

August: the Hottest Month in Mount Fuji

During the daytime, the weather under the Mount Fuji is hot overall, with the average high temperature of 28 degrees Celsius (82.4 degrees Fahrenheit). In some days, the maximum temperature exceeds 30℃ (86℉); and there may be a few occasions when the highest temperature reaches 35℃ (95℉). If there is continuous intense rainfall, the daytime temperature may drop to around 25℃ (77℉). The temperature in the early mornings and evenings is very comfortable, ranging from 16-22℃ (60.8-71.6℉).

Due to the high altitude, the climate in the higher elevations of the mountain is generally cold even in the hottest month, with the temperature averaging 4-10℃ (39.2-50℉). Delightfully, as there is no snow cover, the summit of Mount Fuji is open to tourists.

Precipitation & Humidity

The foothills region sees rain on approximately 19 days in August, indicating a moderately high rainfall frequency during the month. However, with the end of the rainy season, it experiences a significant decrease in precipitation, averaging approximately 198 mm. Most of the time, the rain comes in fits and starts and lightly, and thundershowers are more likely to occur in the afternoon and at dusk; if there are moderate to heavy showers, the sky will clear up faster. The weather on the mountain is changeable and thunderstorms may occur suddenly.

The monthly average humidity is 81% under the mountain and 75% at the top.

Daylight Hours & Sunshine Hours

Sunrise time (1st-31st): 04: 54 – 05: 17
Sunset time (1st-31st): 18: 50 - 18: 16

During the first few days of the month, you can enjoy up to 14 hours of daylight each day, but then the sun sets earlier and by the end of the month, daylight hours are down to around 13 hours. Considering the frequent rainfall and thick clouds, it’s hard to see sunny days in a row; But as the duration of precipitation each day is not long, there is still about 9 hours of sunshine on average per day.

The UV rays in August cannot be underestimated with the monthly average index of 5 under the mountain. They are even stronger around sunny noon, not to mention at high altitudes where you’re very likely to get a severe sunburn without proper sun protection. Therefore, sunscreen is a must during your trip in Mount Fuji in August.

What to Wear and Bring to Mount Fuji in August?

 Clothing
If you’re just staying in the foothills, dress coolly: short-sleeved shirts, shorts, or skirts are fine. If the sun is too strong, it’s recommended to wear light, breathable top and long pants with sun protection characteristics. If you plan to go hiking, you’d better wear a quick-drying shirt underneath to prevent discomfort caused by sweating and climbing trousers for the bottom. Plus, you need to pack warm clothes in your bag, like a 3-in-1 jacket, as the temperature drops quickly above the 5th Station.

 Footwear
It’s advisable to wear breathable and light sneakers that are comfortable for long walk and it would be better to bring water-proof shoe covers in case of the rain. Mountain climbers are recommended to wear climbing shoes with high tops since the road to the summit is quite bumpy.

 Other

Rain gear is highly needed. Other necessities for Mount Fuji trip in August include sun hats and glasses, which are particularly crucial for hikers. Additionally, trekking poles, altitude sickness medicine, and oxygen supply can provide extra help to climbers.

Travel Delights in Mount Fuji in August

 Every year in the early days of August, the Five Lakes region surrounding Mount Fuji hosts numerous fireworks activities, including the most grandiose Lake Kawaguchi Fireworks Festival, and other fireworks festivals held in places like the Lake Saiko and the Lake Motosuko. At night, dazzling fireworks explode across the lakes, creating a unique and dreamy spectacle against the majestic backdrop of Mount Fuji. In addition, various street food markets are also available to satisfy your appetite. You may also enjoy music performance at the festive night.

 During the Obon Festival in mid-August each year, the Lake Kawaguchi offers a unique spectacle: over one thousand of illuminated lanterns float across the lake, carrying good wishes and longings for departed loved ones. With soft light reflecting on the rippling surface and the elegant performances of a live orchestra, you’ll have an unforgettable, tender summer night.

Travel Tips

August is the peak climbing season for Mount Fuji, especially during the Obon Festival, when climbers flock to the mountain. Moreover, the number of people allowed to reach the summit each day is limited to 4,000. Therefore, if you’re planning a hike in August 2026, be sure to make a reservation for climbing and book your accommodation in advance. Above all, climbing is prohibited between 4 p.m. and 3 a.m., so plan your hike accordingly.

Mount Fuji Weather by Month