When to go · Asan
Asan in September
Great month. Inside Asan's best window: Apr–May, Sep–Nov.
Key facts
- Verdict
- Great
- Temperature
- 27°C (81°F)81°F (27°C) / 17°C (63°F)63°F (17°C)
- average high / low
- Rain days
- 8
- Crowds
- Medium
- South Korea overall
- Prices
- Medium
- South Korea overall
Verdict
Inside Asan's best window: Apr–May, Sep–Nov.
Is another month better than September?
No other month rates higher than September for Asan in this guide.
Weather in September
- AsanHighs around 27 °C (81 °F), lows around 17 °C (63 °F), rain on about 8 daysHighs around 81 °F (27 °C), lows around 63 °F (17 °C), 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.
Compare two months
Weather, crowds and prices for any two months in Asan, side by side.
Verdict
Sep: Great
Apr: Great
Daytime high
Sep: 27 °C (81 °F)81 °F (27 °C)
Apr: 18 °C (64 °F)64 °F (18 °C)
Night low
Sep: 17 °C (63 °F)63 °F (17 °C)
Apr: 6 °C (43 °F)43 °F (6 °C)
Rain days
Sep: 8
Apr: 8
Crowds
Sep: Medium
Apr: High
Prices
Sep: Medium
Apr: High
Festivals listed
Sep: 1
Apr: 0
September: Inside Asan's best window: Apr–May, Sep–Nov.
April: Inside Asan's best window: Apr–May, Sep–Nov.
Asan: figures are long-term averages from this guide, not a forecast.
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