Climate averages 1991–2020
Busan weather
in September.
A warm, wet month: the 3rd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Busan: daytime highs average 24.4°C and nights cool to about 20.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 159 mm of rain on roughly 9 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Kimhae (20 km away). In September its highs average 25.0°C, 0.6°C warmer than Busan, with 163 mm of rain.
Among the 79 cities listed in South Korea, Busan ranks joint 58th of 79 for the warmest September highs and 59th of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.8°C; Busan is 0.3°C cooler than that mean.
From September to October, average highs fall by 4.4°C to 20.1°C, and monthly rainfall falls from 159 mm to 72 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Busan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.5°C0.5°C | 0.5°C | 37 | 4.6 | 10.110 h |
| February | 8.3°C1.6°C | 1.6°C | 47 | 5.2 | 10.911 h |
| March | 11.8°C5.1°C | 5.1°C | 89 | 7.9 | 11.912 h |
| April | 16.0°C9.4°C | 9.4°C | 121 | 8.1 | 13.013 h |
| May | 19.8°C13.8°C | 13.8°C | 130 | 7.6 | 14.014 h |
| June | 22.8°C17.9°C | 17.9°C | 167 | 9.2 | 14.514 h |
| July | 25.9°C22.3°C | 22.3°C | 228 | 11.8 | 14.314 h |
| August | 27.5°C23.8°C | 23.8°C | 181 | 11.0 | 13.513 h |
| September, selected | 24.4°C20.1°C | 20.1°C | 159 | 8.8 | 12.412 h |
| October | 20.1°C14.6°C | 14.6°C | 72 | 4.5 | 11.311 h |
| November | 14.4°C8.3°C | 8.3°C | 52 | 5.4 | 10.410 h |
| December | 8.6°C2.4°C | 2.4°C | 33 | 4.1 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Kimhae in SeptemberSouth Korea · 20 kmHigh 25.0°C · Low 19.4°C · 163 mm rain
- Gijang in SeptemberSouth Korea · 23 kmHigh 24.3°C · Low 20.3°C · 171 mm rain
- Yangsan in SeptemberSouth Korea · 27 kmHigh 25.3°C · Low 19.3°C · 163 mm rain
- Changwon in SeptemberSouth Korea · 35 kmHigh 25.3°C · Low 18.9°C · 162 mm rain
- Ungsang in SeptemberSouth Korea · 36 kmHigh 24.3°C · Low 19.3°C · 173 mm rain
- Geoje in SeptemberSouth Korea · 44 kmHigh 24.1°C · Low 21.3°C · 173 mm rain
- Sinhyeon in SeptemberSouth Korea · 44 kmHigh 24.4°C · Low 21.0°C · 172 mm rain
- Naesŏ in SeptemberSouth Korea · 49 kmHigh 25.5°C · Low 18.4°C · 154 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Busan) is explained once on the Busan year overview and on the Sources, method and limits page.