Incheon Weather in September: What to Expect
In September, Incheon averages highs of 25.1°C and lows of 18°C, with about 9 rainy days (~125 mm). Verdict: Good — comfortable — manageable 25.1°C days. That makes it the 4th hottest of South Korea's 6 main cities this month.
Incheon vs other South Korea cities in September
South Korea is not one climate. In September, Jeju runs to 25.6°C while Sokcho sits at 23.3°C — a 2°C spread. Here is where Incheon falls:
What to pack for Incheon in September
With highs near 25.1°C and lows around 18°C, pack light summer clothing plus a thin layer for evenings, a compact umbrella or rain shell.
Incheon is on the coast — add swimwear; the water can feel cool for swimming this month.
What to do in Incheon in September
September's weather suits sightseeing through the day. Top sights:
Public holidays in South Korea, September
- 2026-09-24 — Chuseok
- 2026-09-25 — Chuseok
- 2026-09-26 — Chuseok
- 2027-09-14 — Chuseok
- 2027-09-15 — Chuseok
- 2027-09-16 — Chuseok
Incheon in September — FAQs
What is the weather like in Incheon in September?
In September, Incheon averages daytime highs of 25.1°C and overnight lows around 18°C, with roughly 9 rainy days and about 125 mm of rain across the month. Good — comfortable — manageable 25.1°C days.
Is September a good time to visit Incheon?
Good — comfortable. September is comfortable enough for full-day sightseeing in Incheon. Among South Korea's cities, Incheon is the 4th hottest this month.
What should I pack for Incheon in September?
For September (18–25.1°C), pack light summer clothing plus a thin layer for evenings, a compact umbrella or rain shell.
What is there to do in Incheon in September?
Incheon's main sights include Taeanhaean National Park, Gwangmyeong Cave. The weather suits visiting these comfortably through the day.
Are there public holidays in South Korea in September?
Yes — Chuseok (2026-09-24), Chuseok (2026-09-25), Chuseok (2026-09-26), Chuseok (2027-09-14), Chuseok (2027-09-15), Chuseok (2027-09-16). Sites can be busier or closed around these dates.
Incheon weather by month: