Climate averages 1991–2020
Muan weather
by month.
See how the year changes. August has the highest average daily maximum; January has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: MayOctober
Long-term climate patterns, not a forecast for a particular trip.
Across the year Muan averages a daytime high of 17.6°C and a nighttime low of 10.0°C, with about 1,144 mm of rain on roughly 95 days. August is the warmest month (average high 29.0°C) and January the coolest (5.1°C). July is the wettest month with 219 mm; January is the driest with 25 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): May and October. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Muan
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 | 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
Nearby cities
- MokpoSouth Korea · 21 kmHigh 16.5°C · Low 10.7°C · 1,239 mm rain a year
- MasanSouth Korea · 36 kmHigh 18.1°C · Low 9.0°C · 1,206 mm rain a year
- GwangjuSouth Korea · 44 kmHigh 17.9°C · Low 8.8°C · 1,229 mm rain a year
- Koch'angSouth Korea · 53 kmHigh 17.4°C · Low 9.8°C · 1,183 mm rain a year
- JeongeupSouth Korea · 79 kmHigh 17.5°C · Low 9.0°C · 1,254 mm rain a year
- SuncheonSouth Korea · 92 kmHigh 18.4°C · Low 9.9°C · 1,512 mm rain a year
- NangenSouth Korea · 95 kmHigh 17.8°C · Low 8.7°C · 1,249 mm rain a year
- KwangyangSouth Korea · 101 kmHigh 18.2°C · Low 10.2°C · 1,512 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+9, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 35.00°, 126.50° (2 km from the city centre), adjusted up by 0.1°C for the difference between the city's elevation (21 m) and the cell's (37 m). Rain comes from the 0.25° cell at 35.00°, 126.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.