Jeju · AutumnMonth summary
Jeju weather in September
✅ Good
🌡️ Temperature min / max
22°C – 26°C
🌧 Rainy days
63% of days
☀️ Sunshine
9.4h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.2/10
📅 📅 Best month
May (7.5/10)
Quick decision
Should you visit Jeju in September?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: September is a good time to visit Jeju. May remains slightly better (+0.3 pts).
By trip type
Jeju in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 🌿 Shoulder
Local context
What to expect in September
🎯 Ideal beach temperature (26°C) — crowds still moderate Autumn in Jeju is often underrated: 26°C, golden light and declining crowds. An interesting window. With 63% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. May (7.5/10) is significantly better if possible.
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All months for Jeju
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 3°C | 8°C | 46% | 3.3 | 6.3h | 3.9/10 |
| 🌦️ February | 2°C | 8°C | 43% | 3.3 | 7.8h | 4.1/10 |
| 🌦️ March | 6°C | 13°C | 40% | 4.2 | 9.7h | 5.3/10 |
| 🌤️ April | 11°C | 18°C | 34% | 4.5 | 10.9h | 7.1/10 |
| 🌤️ May | 15°C | 22°C | 36% | 4.8 | 10.6h | 7.5/10 |
| 🌤️ June | 19°C | 25°C | 45% | 6.9 | 9.7h | 7.4/10 |
| 🌤️ July | 25°C | 29°C | 57% | 7.5 | 10.5h | 7.4/10 |
| 🌤️ August | 26°C | 30°C | 59% | 7.7 | 12.3h | 7.4/10 |
| ⛅ September | 22°C | 26°C | 63% | 11.8 | 9.4h | 7.2/10 |
| 🌤️ October | 17°C | 20°C | 41% | 5.8 | 9.8h | 7.1/10 |
| ⛅ November | 10°C | 16°C | 35% | 3.6 | 8.4h | 6.8/10 |
| 🌦️ December | 5°C | 10°C | 42% | 2.8 | 6.0h | 4.1/10 |
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, Jeju averages 26°C, 63% rainy days and 9.4h of sunshine per day. Overall weather score: 7.2/10.
See methodology →
Comparison
September vs May (best month)
The best month is May (score 7.5/10). Difference:
- 🌡️ Max temperature : -4°C
- 🌧 Rainy days : -27%
- ☀️ Sunshine : +1.2h/day
FAQ
FAQ — Jeju in September
Is September a good time to visit Jeju?
September is an acceptable time for Jeju (score 7.2/10). Conditions are decent but not optimal — consider May (7.5/10) if possible.
Does it rain a lot in Jeju in September?
Yes, 63% of days see rain in September. Plan some indoor activities as backup.
Accommodation
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Activities & tours
Activities and tours in Jeju
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