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The weather in South Korea in September is hot. The average temperatures are between 20°C and 26°C.
You can expect about 3 to 8 days of rain in South Korea 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 South Korea in September 2025.
If you’re planning to visit South Korea in the near future, we highly recommend that you review the 14 day weather forecast for South Korea before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -4° | 4 | 19 | 8 | 25 mm | Awful | South Korea in January |
| February | 4° / -1° | 2 | 22 | 4 | 35 mm | Awful | South Korea in February |
| March | 10° / 4° | 3 | 26 | 2 | 59 mm | Bad | South Korea in March |
| April | 15° / 9° | 5 | 25 | 0 | 83 mm | Good | South Korea in April |
| May | 21° / 14° | 5 | 26 | 0 | 119 mm | Good | South Korea in May |
| June | 25° / 19° | 5 | 25 | 0 | 138 mm | Perfect | South Korea in June |
| July | 28° / 23° | 11 | 20 | 0 | 438 mm | Good | South Korea in July |
| August | 29° / 24° | 10 | 21 | 0 | 325 mm | Ok | South Korea in August |
| September | 26° / 20° | 5 | 25 | 0 | 156 mm | Perfect | South Korea in September |
| October | 20° / 14° | 3 | 28 | 0 | 77 mm | Good | South Korea in October |
| November | 12° / 7° | 4 | 24 | 2 | 86 mm | Bad | South Korea in November |
| December | 3° / -1° | 5 | 18 | 8 | 40 mm | Awful | South Korea in December |