Climate averages 1991–2020
Naesŏ weather
in September.
A warm, wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Naesŏ: daytime highs average 25.5°C and nights cool to about 18.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 154 mm of rain on roughly 9 days, which makes September a wet month (the 10th 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 Changwon (15 km away). In September its highs average 25.3°C, about as warm as Naesŏ, with 162 mm of rain.
Among the 79 cities listed in South Korea, Naesŏ ranks joint 6th of 79 for the warmest September highs and joint 57th of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.8°C; Naesŏ is 0.7°C warmer than that mean.
From September to October, average highs fall by 4.9°C to 20.6°C, and monthly rainfall falls from 154 mm to 63 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
Naesŏ climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.0°C-2.0°C | -2.0°C | 25 | 3.5 | 10.110 h |
| February | 8.4°C-0.8°C | -0.8°C | 35 | 4.3 | 10.911 h |
| March | 12.8°C2.9°C | 2.9°C | 70 | 6.9 | 11.912 h |
| April | 18.1°C8.0°C | 8.0°C | 97 | 7.7 | 13.113 h |
| May | 22.8°C13.2°C | 13.2°C | 105 | 7.8 | 14.014 h |
| June | 25.8°C17.8°C | 17.8°C | 152 | 9.4 | 14.514 h |
| July | 28.2°C22.2°C | 22.2°C | 225 | 14.2 | 14.314 h |
| August | 29.1°C23.1°C | 23.1°C | 202 | 14.3 | 13.513 h |
| September, selected | 25.5°C18.4°C | 18.4°C | 154 | 9.4 | 12.412 h |
| October | 20.6°C11.9°C | 11.9°C | 63 | 4.5 | 11.311 h |
| November | 14.1°C5.2°C | 5.2°C | 43 | 4.7 | 10.310 h |
| December | 7.9°C-0.4°C | -0.4°C | 25 | 3.2 | 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
- Changwon in SeptemberSouth Korea · 15 kmHigh 25.3°C · Low 18.9°C · 162 mm rain
- Changnyeong in SeptemberSouth Korea · 33 kmHigh 25.5°C · Low 16.8°C · 142 mm rain
- Kimhae in SeptemberSouth Korea · 33 kmHigh 25.0°C · Low 19.4°C · 163 mm rain
- Chinju in SeptemberSouth Korea · 40 kmHigh 25.4°C · Low 17.3°C · 192 mm rain
- Sinhyeon in SeptemberSouth Korea · 42 kmHigh 24.4°C · Low 21.0°C · 172 mm rain
- Tongyeong in SeptemberSouth Korea · 45 kmHigh 24.8°C · Low 20.1°C · 174 mm rain
- Yangsan in SeptemberSouth Korea · 48 kmHigh 25.3°C · Low 19.3°C · 163 mm rain
- Busan in SeptemberSouth Korea · 49 kmHigh 24.4°C · Low 20.1°C · 159 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 Naesŏ) is explained once on the Naesŏ year overview and on the Sources, method and limits page.