Onsŏng in September
7.8out of 10
Yes, a good time to go
Mild: highs around 21°C. Some rain: about 8 rainy days.
21°CAvg high
10°CAvg low
8Rainy days (64 mm)
12:17 hDaylight
06:06Sunrise · 18:23 Sunset
Why this score
- Mild: highs around 21°C
- Some rain: about 8 rainy days
What to wear and pack
- Layers you can add or remove
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.1 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -7°C | -18°C | 9 mm | 2 | – | – | 4.9 |
| February | -3°C | -15°C | 11 mm | 2 | – | – | 4.8 |
| March | 4°C | -7°C | 22 mm | 5 | – | – | 4.9 |
| April | 13°C | 1°C | 44 mm | 8 | – | – | 6.5 |
| May | 19°C | 7°C | 78 mm | 13 | – | – | 6.8 |
| June | 22°C | 13°C | 77 mm | 12 | – | – | 7.5 |
| July | 25°C | 17°C | 138 mm | 14 | – | – | 7.0 |
| August | 25°C | 17°C | 128 mm | 13 | – | – | 7.1 |
| September | 21°C | 10°C | 64 mm | 8 | – | – | 7.8 |
| October | 13°C | 2°C | 39 mm | 6 | – | – | 6.8 |
| November | 2°C | -7°C | 26 mm | 5 | – | – | 4.7 |
| December | -6°C | -16°C | 11 mm | 3 | – | – | 4.7 |
Frequently asked questions
How hot is Onsŏng in September?
Daytime highs average 21°C and nights about 10°C.
When is the best time to visit Onsŏng?
The best months are September, June.