Climate in Jeju — Annual Weather Overview
Jeju has a subtropical climate — hot summers, mild winters, rainfall spread throughout the year. The hottest month is August (average high 30.0°C) and the coolest is January (8.3°C). The seasons are strongly defined — a 21.7°C swing between August highs and January lows. Annual rainfall totals around 2072mm. September is the wettest month at 482.5mm, while October averages just 54.2mm. Average daily sunshine is 7.7 hours.
**Spring (March, April, May):** average highs 17.7°C, 406mm rain. **Summer (June, July, August):** average highs 28.2°C, 731mm rain. **Autumn (September, October, November):** average highs 20.7°C, 639mm rain. **Winter (December, January, February):** average highs 9.2°C, 296mm rain.
Jeju — Monthly Temperatures
Jeju — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in Jeju stays reasonable all year.
Jeju weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 8.3°C | 3.4°C | 119.8mm | 5.5h | 14 | 9/10 |
| February | 9.5°C | 3.7°C | 82.5mm | 6.5h | 13 | 10/10 |
| March | 14.4°C | 7.1°C | 129.4mm | 7.8h | 11 | 9/10 |
| April | 16.9°C | 10.2°C | 115.7mm | 9.3h | 8 | 9/10 |
| May | 21.9°C | 15.3°C | 161.4mm | 8.8h | 11 | 9/10 |
| June | 25.7°C | 20.3°C | 199.9mm | 8.2h | 13 | 9/10 |
| July | 28.8°C | 24.2°C | 271.7mm | 7.7h | 19 | 8/10 |
| August | 30.0°C | 25.4°C | 259.4mm | 9.9h | 19 | 8/10 |
| September | 25.7°C | 21.6°C | 482.5mm | 7.6h | 18 | 8/10 |
| October | 20.4°C | 15.6°C | 54.2mm | 8.7h | 8 | 10/10 |
| November | 16.1°C | 10.4°C | 102.3mm | 6.8h | 12 | 9/10 |
| December | 9.7°C | 4.8°C | 93.7mm | 5.3h | 15 | 10/10 |
For the full verdict on when to go, see the best time to visit Jeju and the Jeju rainy season guide. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does Jeju have?
Jeju has a subtropical climate — hot summers, mild winters, rainfall spread throughout the year. Average highs range from 8.3°C in January to 30.0°C in August.
What is the hottest month in Jeju?
August is the hottest month in Jeju, with average highs of 30.0°C and lows of 25.4°C.
What is the coldest month in Jeju?
January is the coolest month, with average highs of 8.3°C and lows of 3.4°C.
What is the wettest month in Jeju?
September is the wettest month, averaging 482.5mm of rainfall over around 18 rainy days.
When is rainy season in Jeju?
Rainy season in Jeju runs January, March to September and November, when rainfall is significantly higher than the rest of the year. Full rainy season guide →
How much rain does Jeju get per year?
Jeju receives around 2072mm of rain per year. The driest month is October (54.2mm).
When is the best time to visit Jeju?
The best time to visit Jeju is All year. See the full month-by-month guide →
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Trip essentials for Jeju
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.