Wonsan weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: April – June, September – October
What is the weather like in Wonsan in September?
In September, Wonsan is warm: daytime highs average 23 °C, and nights cool down to about 16 °C. The sea averages 22.2 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 141 mm in total. All in all, September is a good month for a holiday in Wonsan.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 61 | 77 | 78 |
| Day | 27° | 23° | 17° |
| Night | 21° | 16° | 9° |
| Sea | 25° | 22° | 18° |
| Sun | 5 h | 6 h | 7 h |
| Rain days | 16 | 10 | 8 |
More details for September
- Daylight
- 12 h 30 min06:10 – 18:41
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 6 daysdew point 18 °C or moreAll months
- Wind
- 12 km/haverage daily peakAll months
- Cloud cover
- 60 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+9Asia/Pyongyang
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 30 %56 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Wonsan in September: quick answers
Is Wonsan hot in September?
Warm rather than hot: in September, daytime highs in Wonsan average 23 °C and nights cool to about 16 °C.
Can you swim in Wonsan in September?
Yes. In September the sea averages 22.2 °C – refreshing for a swim.
Does it rain much in Wonsan in September?
Rain is frequent, with about 10 rainy days and 141 mm in total.
Wonsan month by month
The whole year in WonsanAll destinations: North KoreaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences