Climate averages 1991–2020
Muan weather
in September.
A warm, wet month: the 4th 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 Muan: daytime highs average 25.4°C and nights cool to about 18.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 147 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 Mokpo (21 km away). In September its highs average 24.5°C, 0.8°C cooler than Muan, with 149 mm of rain.
Among the 79 cities listed in South Korea, Muan ranks joint 11th of 79 for the warmest September highs and joint 48th of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.8°C; Muan is 0.6°C warmer than that mean.
From September to October, average highs fall by 5.2°C to 20.1°C, and monthly rainfall falls from 147 mm to 52 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
Muan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.1°C-1.0°C | -1.0°C | 25 | 4.5 | 10.110 h |
| February | 6.9°C-0.5°C | -0.5°C | 34 | 5.1 | 10.911 h |
| March | 11.2°C2.3°C | 2.3°C | 59 | 7.0 | 11.912 h |
| April | 16.9°C7.2°C | 7.2°C | 81 | 7.5 | 13.013 h |
| May | 21.8°C12.4°C | 12.4°C | 92 | 7.9 | 14.014 h |
| June | 25.6°C17.4°C | 17.4°C | 156 | 9.4 | 14.514 h |
| July | 27.8°C22.1°C | 22.1°C | 219 | 15.2 | 14.314 h |
| August | 29.0°C23.0°C | 23.0°C | 206 | 14.6 | 13.513 h |
| September, selected | 25.4°C18.4°C | 18.4°C | 147 | 8.9 | 12.412 h |
| October | 20.1°C12.1°C | 12.1°C | 52 | 4.3 | 11.311 h |
| November | 13.8°C6.2°C | 6.2°C | 45 | 6.0 | 10.410 h |
| December | 7.4°C0.8°C | 0.8°C | 26 | 4.5 | 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
- Mokpo in SeptemberSouth Korea · 21 kmHigh 24.5°C · Low 19.0°C · 149 mm rain
- Masan in SeptemberSouth Korea · 36 kmHigh 25.8°C · Low 17.5°C · 145 mm rain
- Gwangju in SeptemberSouth Korea · 44 kmHigh 25.7°C · Low 17.2°C · 138 mm rain
- Koch'ang in SeptemberSouth Korea · 53 kmHigh 25.3°C · Low 18.3°C · 150 mm rain
- Jeongeup in SeptemberSouth Korea · 79 kmHigh 25.3°C · Low 17.5°C · 147 mm rain
- Suncheon in SeptemberSouth Korea · 92 kmHigh 25.9°C · Low 18.4°C · 160 mm rain
- Nangen in SeptemberSouth Korea · 95 kmHigh 25.5°C · Low 17.0°C · 140 mm rain
- Kwangyang in SeptemberSouth Korea · 101 kmHigh 25.7°C · Low 18.8°C · 160 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 Muan) is explained once on the Muan year overview and on the Sources, method and limits page.