Jeju · AutumnMonth summary
Jeju weather in September
✅ Good
🌡️ Temperature min / max
72°F – 79°F
🌧 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: Favourable conditions in September (7.2/10). May scores higher but the gap is small.
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
Autumn in Jeju is often underrated: 26°F, 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 °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 37°F | 46°F | 46% | 0.1in | 6.3h | 3.9/10 |
| 🌦️ February | 36°F | 46°F | 43% | 0.1in | 7.8h | 4.1/10 |
| 🌦️ March | 43°F | 55°F | 40% | 0.2in | 9.7h | 5.3/10 |
| 🌤️ April | 52°F | 64°F | 34% | 0.2in | 10.9h | 7.1/10 |
| 🌤️ May | 59°F | 72°F | 36% | 0.2in | 10.6h | 7.5/10 |
| 🌤️ June | 66°F | 77°F | 45% | 0.3in | 9.7h | 7.4/10 |
| 🌤️ July | 77°F | 84°F | 57% | 0.3in | 10.5h | 7.4/10 |
| 🌤️ August | 79°F | 86°F | 59% | 0.3in | 12.3h | 7.4/10 |
| ⛅ September | 72°F | 79°F | 63% | 0.5in | 9.4h | 7.2/10 |
| 🌤️ October | 63°F | 68°F | 41% | 0.2in | 9.8h | 7.1/10 |
| ⛅ November | 50°F | 61°F | 35% | 0.1in | 8.4h | 6.8/10 |
| 🌦️ December | 41°F | 50°F | 42% | 0.1in | 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 79°F, 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°F
- 🌧 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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