When to go · Gunpo
Gunpo in September
Mixed month. Outside the best window (Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking)). Across South Korea: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.
Key facts
- Verdict
- Mixed
- Temperature
- 26°C (79°F)79°F (26°C) / 18°C (64°F)64°F (18°C)
- average high / low
- Rain days
- 8
- Crowds
- Medium
- South Korea overall
- Prices
- Medium
- South Korea overall
Verdict
Outside the best window (Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking)). Across South Korea: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.
Is another month better than September?
September is rated mixed. These months rate higher:
- OctoberGreatInside Gunpo's best window: Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking).
- NovemberGreatInside Gunpo's best window: Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking).
- AprilGreatInside Gunpo's best window: Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking).
- MayGreatInside Gunpo's best window: Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking).
Weather in September
- GunpoHighs around 26 °C (79 °F), lows around 18 °C (64 °F), rain on about 8 daysHighs around 79 °F (26 °C), lows around 64 °F (18 °C), rain on about 8 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
- 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 Gunpo, side by side.
Verdict
Sep: Mixed
Apr: Great (better)
Daytime high
Sep: 26 °C (79 °F)79 °F (26 °C)
Apr: 18 °C (64 °F)64 °F (18 °C)
Night low
Sep: 18 °C (64 °F)64 °F (18 °C)
Apr: 8 °C (46 °F)46 °F (8 °C)
Rain days
Sep: 8
Apr: 7 (better)
Crowds
Sep: Medium
Apr: High
Prices
Sep: Medium
Apr: High
Festivals listed
Sep: 1
Apr: 0
September: Outside the best window (Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking)). Across South Korea: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.
April: Inside Gunpo's best window: Apr–May (azaleas and cherry blossom), Oct–Nov (autumn leaves, hiking).
Gunpo: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.