Climate averages 1991–2020
Geoje 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 Geoje: daytime highs average 24.1°C and nights cool to about 21.3°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 173 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 Sinhyeon (10 km away). In September its highs average 24.4°C, about as warm as Geoje, with 172 mm of rain.
Among the 79 cities listed in South Korea, Geoje ranks joint 71st of 79 for the warmest September highs and joint 72nd of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.8°C; Geoje is 0.6°C cooler than that mean.
From September to October, average highs fall by 4.3°C to 19.8°C, and monthly rainfall falls from 173 mm to 78 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
Geoje climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.8°C2.4°C | 2.4°C | 42 | 5.2 | 10.110 h |
| February | 8.2°C3.5°C | 3.5°C | 51 | 5.7 | 10.911 h |
| March | 11.2°C6.9°C | 6.9°C | 97 | 8.3 | 11.912 h |
| April | 14.7°C11.1°C | 11.1°C | 127 | 8.5 | 13.013 h |
| May | 18.1°C15.2°C | 15.2°C | 132 | 8.0 | 14.014 h |
| June | 21.2°C18.9°C | 18.9°C | 180 | 9.6 | 14.414 h |
| July | 24.9°C22.8°C | 22.8°C | 240 | 11.8 | 14.214 h |
| August | 26.8°C24.6°C | 24.6°C | 187 | 11.6 | 13.513 h |
| September, selected | 24.1°C21.3°C | 21.3°C | 173 | 9.0 | 12.412 h |
| October | 19.8°C16.3°C | 16.3°C | 78 | 5.2 | 11.311 h |
| November | 14.5°C10.4°C | 10.4°C | 58 | 6.0 | 10.410 h |
| December | 9.0°C4.5°C | 4.5°C | 39 | 4.8 | 9.910 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
- Sinhyeon in SeptemberSouth Korea · 10 kmHigh 24.4°C · Low 21.0°C · 172 mm rain
- Tongyeong in SeptemberSouth Korea · 26 kmHigh 24.8°C · Low 20.1°C · 174 mm rain
- Busan in SeptemberSouth Korea · 44 kmHigh 24.4°C · Low 20.1°C · 159 mm rain
- Changwon in SeptemberSouth Korea · 46 kmHigh 25.3°C · Low 18.9°C · 162 mm rain
- Kimhae in SeptemberSouth Korea · 49 kmHigh 25.0°C · Low 19.4°C · 163 mm rain
- Naesŏ in SeptemberSouth Korea · 51 kmHigh 25.5°C · Low 18.4°C · 154 mm rain
- Yangsan in SeptemberSouth Korea · 66 kmHigh 25.3°C · Low 19.3°C · 163 mm rain
- Gijang in SeptemberSouth Korea · 67 kmHigh 24.3°C · Low 20.3°C · 171 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 Geoje) is explained once on the Geoje year overview and on the Sources, method and limits page.