Incheon weather in September
September in Incheon: warm, soaked, with very humid — fine if you can take 10 rainy days.
#5 of 12 months in Incheon · #580 of 897 destinations to visit in September · comfort 76/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Incheon in September
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Incheon climate normals — September
| Daytime high | 25°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Rainfall | 167 mm / 6.6 in | ⛈ soaked |
| Rainy days | 10 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 8 h/day | |
| Daylight | 12.4 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 73 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Incheon in September — FAQ
- Is September a good time to visit Incheon?
- September in Incheon: warm, soaked, with very humid — fine if you can take 10 rainy days. It ranks #5 of 12 months for Incheon on SeasonMap's comfort score (76/100).
- What is the weather like in Incheon in September?
- In September, Incheon averages a daily high of 24.7°C and a low of 18.7°C, with about 167.2 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Incheon in September?
- Incheon has a mean US Air Quality Index of about 73 in September.