Incheon Weather in September
What's the weather like in Incheon (Incheon) in September 2025?
The climate in Incheon during September can be summarized as warm, humid and wet.
September is in the fall / autumn in Incheon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (78°F), whilst at night 16°C (61°F) is normal.
| Daytime temperature | 25.5°C 77.8°F |
|---|---|
| Nightly temperature | 16.2°C 61.1°F |
| Average temperature | 20.8°C 69.4°F |
| Daily sunshine | 7.4 hrs |
| Avg rainfall | 154 mm 6.1 ins |
| Rainy days | 8 days |
| Sea temperature | 23.2°C 73.8°F |
| Humidity | 76% |
| Windspeed | 6.5kph 4 mph |
On average September is the 3rd wettest month of the year in Incheon with around 154mm 6.1 inches of rain making it a wet time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.4 hours of sunshine per day.
September temperatures in Incheon
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Incheon in September 2025.
Other monthly averages
Best places to visit in September
Incheon weather stats
| Hottest month: | August | 29°C 84.2°F |
|---|---|---|
| Driest month: | December | 21mm 0.8ins |
| Sunniest month: | October | 7.4hrs |
| Coldest month: | January | 1.2°C 34.2°F |
| Wettest month: | July | 317mm 12.5ins |
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