Sejong in September
7.7out of 10
Yes, a good time to go
Warm and comfortable: highs around 26°C. Frequent rain: about 9 rainy days.
26°CAvg high
17°CAvg low
9Rainy days (143 mm)
12:13 hDaylight
06:19Sunrise · 18:32 Sunset
Why this score
- Warm and comfortable: highs around 26°C
- Frequent rain: about 9 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.8 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 | 3°C | -5°C | 22 mm | 4 | – | – | 5.0 |
| February | 6°C | -3°C | 31 mm | 5 | – | – | 5.6 |
| March | 12°C | 1°C | 48 mm | 6 | – | – | 6.5 |
| April | 19°C | 7°C | 79 mm | 7 | – | – | 7.7 |
| May | 24°C | 13°C | 85 mm | 8 | – | – | 8.0 |
| June | 28°C | 18°C | 128 mm | 9 | – | – | 7.7 |
| July | 29°C | 22°C | 253 mm | 16 | – | – | 6.0 |
| August | 30°C | 22°C | 224 mm | 16 | – | – | 6.1 |
| September | 26°C | 17°C | 143 mm | 9 | – | – | 7.7 |
| October | 21°C | 10°C | 57 mm | 5 | – | – | 8.2 |
| November | 13°C | 3°C | 42 mm | 6 | – | – | 6.8 |
| December | 5°C | -3°C | 24 mm | 5 | – | – | 5.5 |
Frequently asked questions
How hot is Sejong in September?
Daytime highs average 26°C and nights about 17°C.
When is the best time to visit Sejong?
The best months are October, May, April, June.