Incheon in September
7.9out of 10
Yes, a good time to go
Warm and comfortable: highs around 25°C. Some rain: about 8 rainy days.
25°CAvg high
18°CAvg low
8Rainy days (120 mm)
12:14 hDaylight
06:21Sunrise · 18:34 Sunset
Why this score
- Warm and comfortable: highs around 25°C
- Some rain: about 8 rainy days
What to wear and pack
- T-shirts and light layers
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 | -6°C | 18 mm | 4 | – | – | 4.8 |
| February | 4°C | -4°C | 24 mm | 4 | – | – | 5.3 |
| March | 10°C | 1°C | 35 mm | 5 | – | – | 6.3 |
| April | 16°C | 7°C | 66 mm | 7 | – | – | 7.2 |
| May | 21°C | 13°C | 92 mm | 8 | – | – | 7.8 |
| June | 25°C | 18°C | 130 mm | 8 | – | – | 7.8 |
| July | 27°C | 22°C | 296 mm | 15 | – | – | 6.1 |
| August | 29°C | 23°C | 240 mm | 14 | – | – | 6.5 |
| September | 25°C | 18°C | 120 mm | 8 | – | – | 7.9 |
| October | 20°C | 11°C | 53 mm | 5 | – | – | 8.0 |
| November | 12°C | 3°C | 47 mm | 7 | – | – | 6.5 |
| December | 4°C | -4°C | 23 mm | 5 | – | – | 5.2 |
Frequently asked questions
How hot is Incheon in September?
Daytime highs average 25°C and nights about 18°C.
When is the best time to visit Incheon?
The best months are October, September, May, June.