Lake Kawaguchi Weather in September
Season: early autumn Weather Overview: a little hot but with a temperature drop, 19 rainy days on average
Lake Kawaguchi in September
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Lake Kawaguchi Weather Conditions in September
A Little Hot, but with Temperature Decrease
The average temperature in Lake Kawaguchi in September is 18℃ (64.4℉), and the average highest and lowest temperatures are at 22℃ (71.6℉) and 13℃ (55.4℉) respectively. It is a little hot in the daytime. For example, sometimes, the highest temperature at noon ranges 31 - 32℃ (87.8 - 89.6℉), but don’t worry too much as very hot days are rare. In addition, the temperature shows a decreasing trend from early to late September. There is a day-night temperature difference, and it is usually below 20 degrees Celsius (68℉) at night, and you may feel cool or a little cold. Once it rains, the climate is cold enough for you to wear thick clothes.19 Rainy Days and 6 Sunny Days on Average
Typhoon occasionally strikes Lake Kawaguchi in September, contributing to the average 19 rainy days, 268mm rainfall - the highest in a year, and only 6 sunny days. Heavy rain is possible but rare, so don’t worry too much when going out. Meanwhile, the humidity this month reaches 84%, which means clothes are not easy to dry once they are wet. If you plan to stay here for several days, pack another 1 - 2 suits of clothes to change into.Sun Falls Early
From the early to the end of the month, the sun rises from 5:15 to 5:40 and sets from 18:10 to 17:30, providing a daily 12.5-hour daytime. As it gets dark early, try not to finish your itinerary too late per day. Last, although the average UV index is only 4, sun protection is still advised as the daily sunshine lasts for 7.8 hours.Is September Recommended to Visit Lake Kawaguchi?
From the perspective of climate, September is not recommended. The weather is still a little hot sometimes and the sudden rain may influence your travel. For example, if a typhoon happens, the Mount Fuji hiking trails may be closed, and the Lake Kawaguchi cruise also stops running. If you plan to come to Lake Kawaguchi in September 2025, arrange your itinerary flexibly in case heavy rain or a typhoon happens.From the perspective of landscape, it is also not the best time. First, Mount Fuji’s visibility as a whole is 42% this month, not too low, but not also too high. In addition, the classic snowcapped Fuji can’t be seen in September as the snow begins to accumulate in early October. As for appreciating red leaves, it is too early to come here. Maple leaves’ peak season wouldn’t arrive until November.
What Clothes to Bring to Lake Kawaguchi in September
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Other items to take include a raincoat and an umbrella, which are useful when it rains. Sun cream, sunglasses, and a hat can protect your skin.
Lake Kawaguchi September Travel Advice
1. When hiking Mount Fuji, you should know that the temperature difference between the summit and mountain foot is about 20℃ (68℉). Even in the hot July and August, the temperature on the summit is below 10℃ (50℉). In September, it’s even colder. If you plan to hike Fuji in September 2025, you need to wear thick winter clothes and dress in layers for easy putting on and taking off. Items like oxygen tanks, hiking poles, and drinking water are all needed. For further information, click our Climbing Mount Fuji.2. Other than climbing Fuji, when it is sunny, there are also top things to do around the Lake:
(1) Get up early to see the clear Mount Fuji;
Sunrise in Lake Kawaguchi
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(2) In the morning, when it is not hot, you can go around Hikawa Clock Shop, where you can take photos of Japanese buildings, stroll around the local craft shops, and buy some souvenirs to remember your trip;
Hikawa Clock Shop on Honcho Street
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(3) If it is too hot, you can go to visit indoor attractions. Here, Fujisan Hongu Sengen Taisha Shrine is recommended to feel local religious culture. There, you can see the grand red torii gate, the delicate traditional religious buildings, and ancient sculptures;
Fujisan Hongu Sengen Taisha Shrine
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(4) In the late afternoon, take the Kawaguchi cruise to appreciate the mountain and lake scenery; after that, walk slowly along the lakeside and wait for the sun to set behind Fuji.
