When to go · Sai
Sai in September
Great month. Inside Sai's best window: Jun–Sep (sea‑urchin roe festival, milder weather).
Key facts
- Verdict
- Great
- Temperature
- 22°C (72°F)72°F (22°C) / 13°C (55°F)55°F (13°C)
- average high / low
- Rain days
- 5
- Crowds
- Medium
- Japan overall
- Prices
- Medium
- Japan overall
Verdict
Inside Sai's best window: Jun–Sep (sea‑urchin roe festival, milder weather).
Is another month better than September?
No other month rates higher than September for Sai in this guide.
Weather in September
- SaiHighs around 22 °C (72 °F), lows around 13 °C (55 °F), rain on about 5 daysHighs around 72 °F (22 °C), lows around 55 °F (13 °C), rain on about 5 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 Sai, side by side.
Verdict
Sep: Great
Jun: Great
Daytime high
Sep: 22 °C (72 °F)72 °F (22 °C)
Jun: 23 °C (73 °F)73 °F (23 °C)
Night low
Sep: 13 °C (55 °F)55 °F (13 °C)
Jun: 14 °C (57 °F)57 °F (14 °C)
Rain days
Sep: 5
Jun: 4 (better)
Crowds
Sep: Medium
Jun: Low
Prices
Sep: Medium
Jun: Medium
Festivals listed
Sep: 0
Jun: 0
September: Inside Sai's best window: Jun–Sep (sea‑urchin roe festival, milder weather).
June: Inside Sai's best window: Jun–Sep (sea‑urchin roe festival, milder weather).
Sai: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.