Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -3° | 3 | 21 | 7 | 21 mm | Awful | Incheon in January |
| February | 4° / -1° | 2 | 23 | 3 | 33 mm | Awful | Incheon in February |
| March | 9° / 4° | 3 | 26 | 2 | 56 mm | Bad | Incheon in March |
| April | 14° / 9° | 5 | 25 | 0 | 82 mm | Good | Incheon in April |
| May | 19° / 14° | 5 | 26 | 0 | 123 mm | Good | Incheon in May |
| June | 24° / 19° | 5 | 25 | 0 | 136 mm | Perfect | Incheon in June |
| July | 27° / 23° | 11 | 20 | 0 | 436 mm | Good | Incheon in July |
| August | 28° / 24° | 9 | 22 | 0 | 326 mm | Good | Incheon in August |
| September | 25° / 20° | 4 | 26 | 0 | 156 mm | Perfect | Incheon in September |
| October | 19° / 14° | 2 | 29 | 0 | 74 mm | Good | Incheon in October |
| November | 12° / 7° | 4 | 24 | 1 | 84 mm | Ok | Incheon in November |
| December | 4° / -1° | 5 | 20 | 6 | 37 mm | Awful | Incheon in December |