The weather in Incheon in September is hot. The average temperatures are between 20°C and 25°C.
You can expect about 3 to 8 days of rain in Incheon during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Incheon in September 2025.
If you’re planning to visit Incheon in the near future, we highly recommend that you review the 14 day weather forecast for Incheon before you arrive.
Temperatures
25° / 20°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
156
mm
Sun Hours
10.3
Hrs
