Climate averages 1991–2020
Masan 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 Masan: daytime highs average 25.8°C and nights cool to about 17.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 145 mm of rain on roughly 10 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 Gwangju (8 km away). In September its highs average 25.7°C, about as warm as Masan, with 138 mm of rain.
Among the 79 cities listed in South Korea, Masan ranks 3rd of 79 for the warmest September highs and joint 45th of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.8°C; Masan is 1.0°C warmer than that mean.
From September to October, average highs fall by 5.4°C to 20.4°C, and monthly rainfall falls from 145 mm to 55 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
Masan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.9°C-2.6°C | -2.6°C | 27 | 5.3 | 10.110 h |
| February | 7.1°C-1.8°C | -1.8°C | 34 | 5.4 | 10.911 h |
| March | 12.0°C1.3°C | 1.3°C | 60 | 7.3 | 11.912 h |
| April | 18.0°C6.5°C | 6.5°C | 85 | 7.6 | 13.013 h |
| May | 23.0°C12.0°C | 12.0°C | 97 | 8.0 | 14.014 h |
| June | 26.7°C17.3°C | 17.3°C | 162 | 10.1 | 14.514 h |
| July | 28.6°C22.0°C | 22.0°C | 243 | 16.2 | 14.314 h |
| August | 29.4°C22.6°C | 22.6°C | 224 | 15.7 | 13.513 h |
| September, selected | 25.8°C17.5°C | 17.5°C | 145 | 9.8 | 12.412 h |
| October | 20.4°C10.4°C | 10.4°C | 55 | 4.5 | 11.311 h |
| November | 13.8°C4.3°C | 4.3°C | 46 | 6.3 | 10.410 h |
| December | 7.1°C-1.0°C | -1.0°C | 29 | 5.4 | 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
- Gwangju in SeptemberSouth Korea · 8 kmHigh 25.7°C · Low 17.2°C · 138 mm rain
- Muan in SeptemberSouth Korea · 36 kmHigh 25.4°C · Low 18.4°C · 147 mm rain
- Koch'ang in SeptemberSouth Korea · 36 kmHigh 25.3°C · Low 18.3°C · 150 mm rain
- Jeongeup in SeptemberSouth Korea · 53 kmHigh 25.3°C · Low 17.5°C · 147 mm rain
- Mokpo in SeptemberSouth Korea · 53 kmHigh 24.5°C · Low 19.0°C · 149 mm rain
- Nangen in SeptemberSouth Korea · 59 kmHigh 25.5°C · Low 17.0°C · 140 mm rain
- Suncheon in SeptemberSouth Korea · 63 kmHigh 25.9°C · Low 18.4°C · 160 mm rain
- Kwangyang in SeptemberSouth Korea · 71 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 Masan) is explained once on the Masan year overview and on the Sources, method and limits page.