Jeju City in September

Inside Jeju City's best window: Apr–Jun and Sep–Oct (mild, before summer humidity and after typhoon season).

No other month rates higher than September for Jeju City in this guide.

• Jeju CityHighs around 26 °C (79 °F), lows around 20 °C (68 °F), rain on about 11 daysHighs around 79 °F (26 °C), lows around 68 °F (20 °C), rain on about 11 days
• Jeju, South Korea · Jeju City, Seogwipo, Hallasanstorm or typhoon risk

  Windy and wet; the island takes the first hit of most typhoons. Hallasan summit gets snow in winter; flights stop in strong crosswinds.

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

• Chuseok (harvest festival) big impact

  Chuseok: 24–26 Sep 2026 (passed); about 14–16 Sep 2027 (check) · South Korea

  Same three-day shutdown as Seollal; the largest travel peak of the year.

Crowds · South Korea overall

Medium

Prices · South Korea overall

Medium

South Korea overall: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

Weather, crowds and prices for any two months in Jeju City, side by side.

• A rain jacket or umbrella and shoes that dry fast
• A spare day in the plan: storms can cancel flights and ferries

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