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When to go · Onogawa Onsen

Onogawa Onsen in September

Mixed month. Outside the best window (Dec–Mar for ski, Jun–Aug for fireflies, Apr–May for mild hiking). Across Japan: Still hot; typhoon peak can cancel flights and ferries for a day or two.

Key facts

Verdict
Mixed
Temperature
24°C (75°F) / 16°C (61°F)
average high / low
Rain days
11
Crowds
Medium
Japan overall
Prices
Medium
Japan overall

Verdict

MixedJapan month rating

Outside the best window (Dec–Mar for ski, Jun–Aug for fireflies, Apr–May for mild hiking). Across Japan: Still hot; typhoon peak can cancel flights and ferries for a day or two.

Is another month better than September?

September is rated mixed. These months rate higher:

Weather in September

Long-term averages
  • Onogawa OnsenHighs around 24 °C (75 °F), lows around 16 °C (61 °F), rain on about 11 days

Crowds and prices

Crowds · Japan overall
Medium
Prices · Japan overall
Medium

Japan overall: Still hot; typhoon peak can cancel flights and ferries for a day or two.

Compare two months

Weather, crowds and prices for any two months in Onogawa Onsen, side by side.

  • Verdict

    Sep: Mixed

    Jan: Great (better)

  • Daytime high

    Sep: 24 °C (75 °F)

    Jan: 2 °C (36 °F)

  • Night low

    Sep: 16 °C (61 °F)

    Jan: -5 °C (23 °F)

  • Rain days

    Sep: 11

    Jan: 8 (better)

  • Crowds

    Sep: Medium

    Jan: Low

  • Prices

    Sep: Medium

    Jan: Low

  • Festivals listed

    Sep: 0

    Jan: 1

September: Outside the best window (Dec–Mar for ski, Jun–Aug for fireflies, Apr–May for mild hiking). Across Japan: Still hot; typhoon peak can cancel flights and ferries for a day or two.

January: Inside Onogawa Onsen's best window: Dec–Mar for ski, Jun–Aug for fireflies, Apr–May for mild hiking.

Onogawa Onsen: figures are long-term averages from this guide, not a forecast.

What to pack

  • A rain jacket or umbrella and shoes that dry fast

Build the full packing list for your trip →

Across Japan in September →