Climate averages 1991–2020
Yeosu 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 Yeosu: daytime highs average 24.5°C and nights cool to about 20.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 160 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 Gwangyang (20 km away). In September its highs average 25.4°C, 0.9°C warmer than Yeosu, with 170 mm of rain.
Among the 79 cities listed in South Korea, Yeosu ranks joint 49th of 79 for the warmest September highs and joint 60th of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.8°C; Yeosu is 0.2°C cooler than that mean.
From September to October, average highs fall by 4.6°C to 19.9°C, and monthly rainfall falls from 160 mm to 71 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
Yeosu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.8°C-0.1°C | -0.1°C | 34 | 4.2 | 10.110 h |
| February | 7.6°C1.0°C | 1.0°C | 48 | 4.9 | 10.911 h |
| March | 11.2°C4.6°C | 4.6°C | 92 | 7.4 | 11.912 h |
| April | 15.6°C9.5°C | 9.5°C | 134 | 8.5 | 13.013 h |
| May | 19.7°C14.4°C | 14.4°C | 147 | 8.4 | 14.014 h |
| June | 22.8°C18.6°C | 18.6°C | 194 | 9.4 | 14.414 h |
| July | 26.0°C22.7°C | 22.7°C | 268 | 13.6 | 14.214 h |
| August | 27.5°C23.9°C | 23.9°C | 224 | 12.6 | 13.513 h |
| September, selected | 24.5°C20.1°C | 20.1°C | 160 | 8.9 | 12.412 h |
| October | 19.9°C14.4°C | 14.4°C | 71 | 4.7 | 11.311 h |
| November | 13.8°C7.9°C | 7.9°C | 50 | 5.4 | 10.410 h |
| December | 7.9°C2.1°C | 2.1°C | 31 | 3.9 | 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
- Gwangyang in SeptemberSouth Korea · 20 kmHigh 25.4°C · Low 18.6°C · 170 mm rain
- Kwangyang in SeptemberSouth Korea · 25 kmHigh 25.7°C · Low 18.8°C · 160 mm rain
- Suncheon in SeptemberSouth Korea · 26 kmHigh 25.9°C · Low 18.4°C · 160 mm rain
- Chinju in SeptemberSouth Korea · 62 kmHigh 25.4°C · Low 17.3°C · 192 mm rain
- Tongyeong in SeptemberSouth Korea · 71 kmHigh 24.8°C · Low 20.1°C · 174 mm rain
- Nangen in SeptemberSouth Korea · 76 kmHigh 25.5°C · Low 17.0°C · 140 mm rain
- Gwangju in SeptemberSouth Korea · 81 kmHigh 25.7°C · Low 17.2°C · 138 mm rain
- Masan in SeptemberSouth Korea · 86 kmHigh 25.8°C · Low 17.5°C · 145 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 Yeosu) is explained once on the Yeosu year overview and on the Sources, method and limits page.