Seoul · AutumnMonth summary
Seoul weather in September
✅ Good
🌡️ Temperature min / max
64°F – 77°F
🌧 Rainy days
31% of days
☀️ Sunshine
10.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.8/10
📅 📅 Best month
June (8.1/10)
Quick decision
Should you visit Seoul in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 25°F.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Favourable conditions in September (7.8/10). June scores higher but the gap is small.
By trip type
Seoul in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ✅ Good
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
Autumn in Seoul is often underrated: 25°F, golden light and declining crowds. An interesting window. Expect rain on 31% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if June (8.1/10) remains theoretically better.
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Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌨️ January | 21°F | 36°F | 10% | 0.0in | 8.7h | 5.1/10 |
| 🌫️ February | 23°F | 41°F | 16% | 0.0in | 9.5h | 5.0/10 |
| ⛅ March | 32°F | 54°F | 20% | 0.1in | 10.1h | 7.0/10 |
| 🌤️ April | 43°F | 64°F | 22% | 0.1in | 11.0h | 7.3/10 |
| 🌤️ May | 54°F | 73°F | 27% | 0.1in | 11.9h | 8.0/10 |
| 🌤️ June | 64°F | 81°F | 34% | 0.2in | 11.1h | 8.1/10 |
| ⛅ July | 72°F | 84°F | 56% | 0.4in | 9.9h | 7.3/10 |
| 🌤️ August | 73°F | 86°F | 52% | 0.4in | 10.9h | 7.4/10 |
| 🌤️ September | 64°F | 77°F | 31% | 0.2in | 10.0h | 7.8/10 |
| 🌤️ October | 48°F | 64°F | 23% | 0.1in | 9.2h | 7.2/10 |
| ⛅ November | 36°F | 54°F | 20% | 0.1in | 8.8h | 6.4/10 |
| 🌨️ December | 23°F | 37°F | 15% | 0.0in | 8.4h | 4.8/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Seoul averages 77°F, 31% rainy days and 10.0h of sunshine per day. Overall weather score: 7.8/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 8.1/10). Difference:
- 🌡️ Max temperature : +2°F
- 🌧 Rainy days : +3%
- ☀️ Sunshine : +1.1h/day
FAQ
FAQ — Seoul in September
Is September a good time to visit Seoul?
September is an excellent time to visit Seoul (score 7.8/10). With 77°F, 10.0h of sunshine and 31% rain, conditions are very favourable.
What to do in Seoul in September?
With 77°F max and 10.0h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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