When to go · Asan
Asan in September
Great month. Inside Asan's best window: Apr–May, Sep–Nov.
Key facts
- Verdict
- Great
- Temperature
- 27°C81°F / 17°C63°F
- average high / low
- Rain days
- 8
- Crowds
- Medium
- South Korea overall
- Prices
- Medium
- South Korea overall
Verdict
GreatBest and avoid months for Asan
Inside Asan's best window: Apr–May, Sep–Nov.
Weather in September
- AsanHighs around 27 °C, lows around 17 °C, rain on about 8 daysHighs around 81 °F, lows around 63 °F, rain on about 8 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