Seoul in September
7.8out of 10
Yes, a good time to go
Warm and comfortable: highs around 26°C. Some rain: about 8 rainy days.
26°CAvg high
16°CAvg low
8Rainy days (123 mm)
12:14 hDaylight
06:20Sunrise · 18:33 Sunset
Why this score
- Warm and comfortable: highs around 26°C
- Some rain: about 8 rainy days
What to wear and pack
- T-shirts and light layers
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.3 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 | 2°C | -7°C | 19 mm | 4 | – | – | 4.8 |
| February | 5°C | -5°C | 26 mm | 4 | – | – | 5.3 |
| March | 11°C | 0°C | 38 mm | 6 | – | – | 6.4 |
| April | 18°C | 6°C | 70 mm | 7 | – | – | 7.4 |
| May | 23°C | 12°C | 96 mm | 8 | – | – | 8.0 |
| June | 27°C | 18°C | 134 mm | 9 | – | – | 7.6 |
| July | 28°C | 22°C | 311 mm | 17 | – | – | 6.1 |
| August | 29°C | 22°C | 254 mm | 15 | – | – | 6.1 |
| September | 26°C | 16°C | 123 mm | 8 | – | – | 7.8 |
| October | 20°C | 9°C | 54 mm | 5 | – | – | 8.0 |
| November | 12°C | 2°C | 47 mm | 7 | – | – | 6.4 |
| December | 4°C | -5°C | 23 mm | 5 | – | – | 5.1 |
Frequently asked questions
How hot is Seoul in September?
Daytime highs average 26°C and nights about 16°C.
When is the best time to visit Seoul?
The best months are May, October, September, June.