Yamanakako Weather in September
During September, Yamanakako experiences high daytime temperatures of 25°C (77°F) and cooler nights around 17°C (63°F). As the wettest month of the year, and part of the summer season, expect frequent rainfall.
Rainfall in Yamanakako in September
Yamanakako is in the rainy season in September, with rain on around 19 days and an average of 274 mm (11 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Yamanakako in September
Yamanakako in September gets highs of 25°C (77°F) during the day and drops to 17°C (63°F) at night. This month falls in the summer season. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 17°C (63°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.September in Yamanakako can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Yamanakako's climate page.
Yamanakako Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
25°C (77°F)
Chance of Rain
65%
Precipitation
274 mm (11 in)
Rainy days
19 days
Humidity
68% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Yamanakako typically drop from around 27°C (81°F) at the start of September to approximately 22°C (72°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 16°C (61°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Yamanakako in September
Browse day-by-day weather records for Yamanakako spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Yamanakako historical weather extremes in September
The extremes listed below come from historical weather data collected in Yamanakako from 2002 through 2025.
- On September 2, 2025, temperatures climbed to 36°C (97°F), marking the warmest September day on record.
- On September 15, 2002, Yamanakako saw its coldest September day with temperatures maxing out at 11°C (52°F).
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Yamanakako in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything!What To Do in Yamanakako in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Yamanakako's climate page.
See the full Yamanakako climate overview or explore weather in Japan.
