Hakone Weather in September
Thinking of visiting Hakone in September? Expect high temperatures reaching 26°C (79°F) during the day, dropping to 20°C (68°F) at night, and be prepared for the wettest month of the year.
Rainfall in Hakone in September
Hakone is in the rainy season in September, with rain on around 19 days and an average of 272 mm (11 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.
Temperature in Hakone in September
Hakone in September gets highs of 26°C (79°F) during the day and drops to 20°C (68°F) at night. During September, the summer season is in full swing. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 20°C (68°F), evenings stay pleasantly warm.September in Hakone has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, 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 Hakone's climate page.
Hakone Temperature in September
Min Temperature
20°C (68°F)
Max Temperature
26°C (79°F)
Chance of Rain
63%
Precipitation
272 mm (11 in)
Rainy days
19 days
Humidity
68% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Hakone typically drop from around 29°C (84°F) at the start of September to approximately 24°C (75°F) by the end. Nights are pleasant, with lows typically ranging from 15°C (59°F) to 21°C (70°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 Hakone in September
Browse day-by-day weather records for Hakone spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hakone historical weather extremes in September
Based on 49 years of weather observations in Hakone between 1976 and 2025, these are the recorded extremes.
- Hakone recorded its highest September temperature of 35°C (95°F) on September 3, 2025.
- The coldest September day was on September 27, 1980, with a maximum of 16°C (61°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
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unpleasant
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What to Wear in Hakone in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can.What To Do in Hakone 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 Hakone's climate page.
See the full Hakone climate overview or explore weather in Japan.
