Climate averages 1991–2020
Weather in South Korea in September
In September, average daytime highs across the 79 cities listed in South Korea range from 22.1°C in Gangneung to 26.0°C in Seogwipo. Monthly rainfall ranges from 118 mm in Uijeongbu-si to 192 mm in Chinju.
Long-term climate patterns, not a forecast for a particular trip.
City by city
September in South Korea
| City | Average highHigh / low | Average low | Rainfall mm | Rain days |
|---|---|---|---|---|
| Seoul | 24.7°C16.4°C | 16.4°C | 124 | 7.6 |
| Busan | 24.4°C20.1°C | 20.1°C | 159 | 8.8 |
| Incheon | 24.0°C17.7°C | 17.7°C | 121 | 7.6 |
| Daegu | 25.4°C17.2°C | 17.2°C | 143 | 9.0 |
| Daejeon | 25.2°C17.0°C | 17.0°C | 138 | 8.4 |
| Gwangju | 25.7°C17.2°C | 17.2°C | 138 | 9.4 |
| Suwon | 24.5°C16.7°C | 16.7°C | 124 | 7.8 |
| Ulsan | 24.6°C19.4°C | 19.4°C | 173 | 10.4 |
| Goyang-si | 24.5°C16.7°C | 16.7°C | 120 | 7.9 |
| Changwon | 25.3°C18.9°C | 18.9°C | 162 | 9.5 |
| Seongnam-si | 24.5°C16.5°C | 16.5°C | 134 | 8.4 |
| Cheongju-si | 25.2°C17.0°C | 17.0°C | 138 | 8.5 |
| Bucheon-si | 24.4°C17.4°C | 17.4°C | 121 | 7.6 |
| Cheonan | 25.2°C17.1°C | 17.1°C | 139 | 8.6 |
| Hwaseong-si | 23.9°C18.4°C | 18.4°C | 127 | 7.3 |
| Jeonju | 25.2°C16.9°C | 16.9°C | 137 | 9.0 |
| Ansan-si | 24.3°C17.8°C | 17.8°C | 127 | 7.3 |
| Anyang-si | 24.3°C17.3°C | 17.3°C | 124 | 7.6 |
| Kimhae | 25.0°C19.4°C | 19.4°C | 163 | 9.6 |
| Pohang | 24.4°C19.1°C | 19.1°C | 154 | 9.8 |
| Jeju City | 25.3°C22.3°C | 22.3°C | 165 | 11.1 |
| Uijeongbu-si | 24.5°C16.3°C | 16.3°C | 118 | 7.7 |
| Paju | 24.6°C16.3°C | 16.3°C | 120 | 7.9 |
| Masan | 25.8°C17.5°C | 17.5°C | 145 | 9.8 |
| Gumi | 25.2°C17.4°C | 17.4°C | 153 | 9.4 |
| Sejong | 25.2°C16.9°C | 16.9°C | 143 | 8.5 |
| Pyeongtaek | 24.9°C17.1°C | 17.1°C | 127 | 7.8 |
| Yangsan | 25.3°C19.3°C | 19.3°C | 163 | 9.6 |
| Gwangmyeong | 24.6°C17.0°C | 17.0°C | 121 | 7.6 |
| Wŏnju | 24.2°C15.2°C | 15.2°C | 130 | 8.7 |
| Chinju | 25.4°C17.3°C | 17.3°C | 192 | 10.8 |
| Iksan | 25.2°C17.1°C | 17.1°C | 145 | 8.4 |
| Chuncheon | 24.1°C16.1°C | 16.1°C | 129 | 8.1 |
| Suncheon | 25.9°C18.4°C | 18.4°C | 160 | 10.3 |
| Yeosu | 24.5°C20.1°C | 20.1°C | 160 | 8.9 |
| Mokpo | 24.5°C19.0°C | 19.0°C | 149 | 8.5 |
| Gyeongsan-si | 25.5°C17.3°C | 17.3°C | 135 | 8.7 |
| Gunsan | 24.4°C18.7°C | 18.7°C | 144 | 8.3 |
| Hanam | 24.8°C16.5°C | 16.5°C | 134 | 8.4 |
| Gyeongju | 25.0°C18.1°C | 18.1°C | 162 | 10.0 |
| Osan | 24.8°C16.9°C | 16.9°C | 124 | 7.8 |
| Geoje | 24.1°C21.3°C | 21.3°C | 173 | 9.0 |
| Chungju | 24.5°C16.4°C | 16.4°C | 134 | 8.5 |
| Gangneung | 22.1°C17.1°C | 17.1°C | 186 | 12.2 |
| Gimpo-si | 24.3°C17.5°C | 17.5°C | 121 | 7.6 |
| Icheon-si | 24.7°C16.2°C | 16.2°C | 130 | 8.1 |
| Guri-si | 24.8°C16.6°C | 16.6°C | 134 | 8.4 |
| Yangju | 24.5°C16.0°C | 16.0°C | 118 | 7.7 |
| Seogwipo | 26.0°C21.8°C | 21.8°C | 183 | 12.4 |
| Gijang | 24.3°C20.3°C | 20.3°C | 171 | 9.7 |
| Gwangyang | 25.4°C18.6°C | 18.6°C | 170 | 10.1 |
| Andong | 24.4°C16.5°C | 16.5°C | 133 | 8.3 |
| Gimcheon | 25.0°C17.2°C | 17.2°C | 168 | 10.2 |
| Jeongeup | 25.3°C17.5°C | 17.5°C | 147 | 9.2 |
| Yeoju | 24.7°C15.9°C | 15.9°C | 127 | 8.2 |
| Hwado | 24.5°C16.2°C | 16.2°C | 131 | 8.4 |
| Sangju | 25.0°C17.1°C | 17.1°C | 147 | 9.1 |
| Donghae City | 22.8°C17.4°C | 17.4°C | 185 | 11.6 |
| Asan | 25.0°C17.1°C | 17.1°C | 137 | 8.1 |
| Wabu | 24.7°C16.3°C | 16.3°C | 134 | 8.4 |
| Boryeong | 24.8°C18.7°C | 18.7°C | 143 | 8.1 |
| Muan | 25.4°C18.4°C | 18.4°C | 147 | 8.9 |
| Kwangyang | 25.7°C18.8°C | 18.8°C | 160 | 10.3 |
| Hongseong | 25.1°C17.4°C | 17.4°C | 145 | 8.7 |
| Yeongju | 24.0°C15.7°C | 15.7°C | 132 | 8.3 |
| Yangp'yŏng | 24.9°C16.4°C | 16.4°C | 136 | 8.6 |
| Ungsang | 24.3°C19.3°C | 19.3°C | 173 | 10.4 |
| Sinhyeon | 24.4°C21.0°C | 21.0°C | 172 | 9.4 |
| Gwangju, South Korea | 24.9°C16.6°C | 16.6°C | 134 | 8.4 |
| Nangen | 25.5°C17.0°C | 17.0°C | 140 | 10.2 |
| Sokcho | 22.2°C16.6°C | 16.6°C | 149 | 10.4 |
| Naesŏ | 25.5°C18.4°C | 18.4°C | 154 | 9.4 |
| Mungyeong | 24.8°C16.8°C | 16.8°C | 147 | 9.1 |
| Hongch’ŏn | 23.8°C15.2°C | 15.2°C | 123 | 8.3 |
| Changnyeong | 25.5°C16.8°C | 16.8°C | 142 | 8.8 |
| Seosan | 24.2°C18.4°C | 18.4°C | 133 | 7.5 |
| Koch'ang | 25.3°C18.3°C | 18.3°C | 150 | 9.5 |
| Gongju | 25.5°C17.5°C | 17.5°C | 147 | 8.6 |
| Tongyeong | 24.8°C20.1°C | 20.1°C | 174 | 8.9 |
A rain day is a local calendar day with at least 1 mm of precipitation.