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Hakone in September: rain, what to pack and what's on

In September, Hakone gets 448.7 mm of rain on about 14.7 days (JMA, 1991–2020). It is Hakone's wettest month. The JMA does not measure temperature in Hakone.

Updated

448.7 mmprecipitation
14.7 dayswet days

Hakone weather in September

Averages for 1991–2020 at the JMA's Hakone rain gauge (855 m above sea level). It records precipitation only.

Precipitation
448.7 mm
Wet days
14.7 days

Of our 15 places, Hakone gets the most precipitation in September: 149.2 mm more than Nikko.

Rain of 1 mm or more falls on 14.7 days, and 10 mm or more on 8.9 days.

Rain of 30 mm or more in one day falls on 4.4 days, and 50 mm or more on 2.8 days, including 0.8 days with 100 mm or more.

Early, mid and late September

Hakone in September by ten-day period: averages for 1991–2020 (JMA)
DaysPrecipitation
1–10 September166.8 mm
11–20 September150.9 mm
21–30 September131.1 mm

By ten-day totals, 1–10 September is the wettest (166.8 mm) and 21–30 September the driest (131.1 mm).

The red torii gate of Hakone Shrine standing in Lake Ashi, with a forested hillside behind it
Photo: Hakone Shrine from Lake Ashi, May 2017.jpg by Celuici (CC BY-SA 3.0, cropped), via Wikimedia Commons.

Rain gear for Hakone in September

The JMA does not measure temperature in Hakone, so we do not give a clothing level. The JMA's nearest temperature stations are at different heights.

  • An umbrella: rain falls on 14.7 days.

Pack

  • Umbrella

Rainy season and typhoons

In an average September, 1.2 typhoons come within 300 km of the Kanto-Koshin region; across Japan, 3.3 come within 300 km and 1.0 make landfall (JMA, 1991–2020).

September records in Hakone

The extremes the JMA has measured in September at its Hakone station.

Wettest September day
487.0 mm on 6 September 2007 (records since 1976)

Holidays and crowds in September

National holidays in September 2027:

  • Mon 20 September — Respect for the Aged Day
  • Thu 23 September — Autumnal Equinox Day
  • Sat 18 September to Mon 20 September: 3 days off in a row

In September 2025, hotels and inns across Kanagawa Prefecture were 61.7% full on average (10th busiest of 12 months). Foreign guests spent 358,030 nights there that month (Japan Tourism Agency). That compares with 69.6% in August and 70.8% in October.

Hakone before and after September

Hakone: August, September and October (JMA, 1991–2020)
MonthPrecipitationWet daysDays of 10 mm or more
August346.1 mm (−102.6 mm)13.1 days (−1.6 days)6.0 days (−2.9 days)
September448.7 mm14.7 days8.9 days
October403.8 mm (−44.9 mm)12.9 days (−1.8 days)7.9 days (−1.0 days)

Other places in September

September: Hakone against five other places (JMA, 1991–2020)
PlacePrecipitationAgainst HakoneWet daysAgainst Hakone
Tokyo224.9 mm−223.8 mm11.0 days−3.7 days
Kyoto178.5 mm−270.2 mm9.8 days−4.9 days
Osaka152.8 mm−295.9 mm9.5 days−5.2 days
Sapporo142.2 mm−306.5 mm10.2 days−4.5 days
OkinawaNaha275.2 mm−173.5 mm11.8 days−2.9 days

Frequently asked questions

What is the weather like in Hakone in September?

Hakone gets 448.7 mm of rain on about 14.7 days in September (JMA, 1991–2020). The JMA does not record temperature in Hakone.

Is Hakone busy in September?

In September 2025, hotels and inns across Kanagawa Prefecture were 61.7% full on average (10th busiest of 12 months). Foreign guests spent 358,030 nights there that month (Japan Tourism Agency).

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Compiled by Japan Japan !! · Updated October 2, 2026