Koesan in September
7.6out of 10
Yes, a good time to go
Warm and comfortable: highs around 25°C. Frequent rain: about 9 rainy days.
25°CAvg high
16°CAvg low
9Rainy days (139 mm)
12:13 hDaylight
06:17Sunrise · 18:30 Sunset
Why this score
- Warm and comfortable: highs around 25°C
- Frequent rain: about 9 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 (±3.5 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 | 23 mm | 5 | – | – | 4.8 |
| February | 5°C | -4°C | 34 mm | 5 | – | – | 5.4 |
| March | 11°C | 1°C | 53 mm | 7 | – | – | 6.3 |
| April | 18°C | 6°C | 83 mm | 8 | – | – | 7.4 |
| May | 23°C | 12°C | 93 mm | 8 | – | – | 7.9 |
| June | 27°C | 17°C | 130 mm | 9 | – | – | 7.6 |
| July | 28°C | 21°C | 256 mm | 17 | – | – | 6.1 |
| August | 29°C | 22°C | 218 mm | 16 | – | – | 6.4 |
| September | 25°C | 16°C | 139 mm | 9 | – | – | 7.6 |
| October | 20°C | 9°C | 58 mm | 6 | – | – | 7.9 |
| November | 12°C | 2°C | 43 mm | 7 | – | – | 6.5 |
| December | 4°C | -4°C | 26 mm | 5 | – | – | 5.2 |
Frequently asked questions
How hot is Koesan in September?
Daytime highs average 25°C and nights about 16°C.
When is the best time to visit Koesan?
The best months are May, October, June, September.