Skip to content
Voykit
Draft data. Times, fares and step counts are desk estimates awaiting field checks. How we verify
Source checked
A source and a date are on record: we read it from an official or published page. Not yet confirmed on the ground.
Field checked
Someone checked it on the ground, with the date shown.
Plan calculated
Worked out by Voykit from its own data (times, distances, budgets). A calculation, not a measurement.

Unknown times stay unknown. How we verify

When to go · Sanmu

Sanmu in September

Avoid month. Listed as a month to avoid: Jan–Feb (cold) and Sep–Oct (less surf activity).

Key facts

Verdict
Avoid
Temperature
27°C (81°F) / 20°C (68°F)
average high / low
Rain days
8
Crowds
Medium
Japan overall
Prices
Medium
Japan overall

Verdict

AvoidBest and avoid months for Sanmu

Listed as a month to avoid: Jan–Feb (cold) and Sep–Oct (less surf activity).

Is another month better than September?

September is rated avoid. These months rate higher:

Weather in September

Long-term averages
  • SanmuHighs around 27 °C (81 °F), lows around 20 °C (68 °F), rain on about 8 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 Sanmu, side by side.

  • Verdict

    Sep: Avoid

    Mar: Great (better)

  • Daytime high

    Sep: 27 °C (81 °F)

    Mar: 14 °C (57 °F)

  • Night low

    Sep: 20 °C (68 °F)

    Mar: 5 °C (41 °F)

  • Rain days

    Sep: 8

    Mar: 6 (better)

  • Crowds

    Sep: Medium

    Mar: High

  • Prices

    Sep: Medium

    Mar: High

  • Festivals listed

    Sep: 0

    Mar: 1

September: Listed as a month to avoid: Jan–Feb (cold) and Sep–Oct (less surf activity).

March: Inside Sanmu's best window: Mar–Apr for strawberries, Jul–Aug for surf; also May–Jun for milder beach weather.

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

What to pack

Nothing unusual for the weather this month.

Build the full packing list for your trip →

Across Japan in September →