When to go · Seosan
Seosan in October
Great month. Inside Seosan's best window: Apr–May, Sep–Oct.
Key facts
- Verdict
- Great
- Temperature
- 21°C (69°F)69°F (21°C) / 9°C (47°F)47°F (9°C)
- average high / low
- Rain days
- 7
- Crowds
- High
- South Korea overall
- Prices
- High
- South Korea overall
Verdict
Inside Seosan's best window: Apr–May, Sep–Oct.
Is another month better than October?
No other month rates higher than October for Seosan in this guide.
Weather in October
- SeosanHighs around 20.5 °C (69 °F), lows around 8.6 °C (47 °F), rain on about 7 daysHighs around 69 °F (20.5 °C), lows around 47 °F (8.6 °C), rain on about 7 days
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
- High
- Prices · South Korea overall
- High
South Korea overall: Clear skies, autumn colour in the mountains, festivals everywhere; Chuseok falls here some years.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in Seosan, side by side.
Verdict
Oct: Great
Apr: Great
Daytime high
Oct: 20.5 °C (69 °F)69 °F (20.5 °C)
Apr: 17.3 °C (63 °F)63 °F (17.3 °C)
Night low
Oct: 8.6 °C (47 °F)47 °F (8.6 °C)
Apr: 5 °C (41 °F)41 °F (5 °C)
Rain days
Oct: 7 (better)
Apr: 8
Crowds
Oct: High
Apr: High
Prices
Oct: High
Apr: High
Festivals listed
Oct: 1
Apr: 0
October: Inside Seosan's best window: Apr–May, Sep–Oct.
April: Inside Seosan's best window: Apr–May, Sep–Oct.
Seosan: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings