When to go · Jeju City
Jeju City in September
Great month. Inside Jeju City's best window: Apr–Jun and Sep–Oct (mild, before summer humidity and after typhoon season).
Key facts
- Verdict
- Great
- Temperature
- 26°C79°F / 20°C68°F
- average high / low
- Rain days
- 11
- Crowds
- Medium
- South Korea overall
- Prices
- Medium
- South Korea overall
Verdict
Inside Jeju City's best window: Apr–Jun and Sep–Oct (mild, before summer humidity and after typhoon season).
Weather in September
- Jeju CityHighs around 26 °C, lows around 20 °C, rain on about 11 daysHighs around 79 °F, lows around 68 °F, 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.
Festivals and holidays
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 and prices
- 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.
What to pack
- A rain jacket or umbrella and shoes that dry fast
- A spare day in the plan: storms can cancel flights and ferries