Jeju Island Weather
A month-by-month look at temperature, rainfall and what to pack in Jeju Island. The annual average is 19°C high / 12°C low — hottest in August (29°C) and coldest in January (2°C).
Jeju Island Weather at a Glance
As of 2026A quick summary of Jeju Island's year-round climate and the best time to visit.
- Annual average
- 19° / 12°
- Best time to visit
- May, October, April
- Hottest month
- August (29°C)
- Coldest month
- January (2°C)
- Wettest month
- July (280mm)
- Driest month
- December (50mm)
As of 2026, Jeju Island's weather averages 19°C high / 12°C low across the year, and the best time to visit for stable temperatures, rainfall and crowds is May, October, April. The hottest month is August (29°C), the coldest is January (2°C), and the wettest is July (280mm).
Best Time to Visit Jeju Island
BEST MONTH for Hallasan azalea + Korean Children's Day family travel. Hallasan trails peak photogenic.
Korean honeymoon peak season — hotels at peak. Pleasant weather + Hallasan autumn foliage starting. Pre-November peak.
Cherry blossom early April peak. Most photogenic. Hotels surge 30-60%. Jeju City cherry blossom path + Hallim Park magical.
Jeju Island Weather Month by Month
Tap any month for a detailed guide with what to wear, sunrise/sunset and air quality.
| Month | High/Low | Rain | Rainy days | Crowds | |
|---|---|---|---|---|---|
| January | 8° / 2° | 60mm | 8 | Quiet | Details → |
| February | 9° / 3° | 65mm | 8 | Quiet | Details → |
| March | 12° / 5° | 90mm | 9 | Moderate | Details → |
| April | 17° / 10° | 100mm | 9 | Very busy | Details → |
| May | 21° / 14° | 100mm | 9 | Very busy | Details → |
| June | 24° / 18° | 200mm | 11 | Moderate | Details → |
| July | 28° / 22° | 280mm | 13 | Busy | Details → |
| August | 29° / 24° | 200mm | 11 | Very busy | Details → |
| September | 26° / 19° | 200mm | 9 | Busy | Details → |
| October | 22° / 14° | 100mm | 7 | Very busy | Details → |
| November | 17° / 10° | 80mm | 7 | Busy | Details → |
| December | 11° / 5° | 50mm | 7 | Moderate | Details → |
What to Wear in Jeju Island by Season
Spring perfect. Light jacket + sweater for evening.
Hot + humid + monsoon. T-shirt + raincoat + UV.
Pleasant autumn. Light jacket + sweater.
Still cool. Warm coat + sweater.
Jeju Island Weather FAQ
What is the best time to visit Jeju Island? +
For weather, May, October, April are the most comfortable months. Highs sit around 21°C with relatively stable rainfall and crowds.
What are the hottest and coldest months in Jeju Island? +
The hottest month is August with an average high of 29°C, and the coldest is January with an average low of 2°C. The annual average is 19°C high / 12°C low.
When does it rain most in Jeju Island? +
The wettest month is July (280mm over about 13 rainy days) and the driest is December (50mm). Total annual rainfall is roughly 1525mm.
What should I pack for Jeju Island? +
Spring (Mar–May) averages 17/10°C — Spring perfect. Light jacket + sweater for evening. Summer (Jun–Aug) averages 27/21°C — Hot + humid + monsoon. T-shirt + raincoat + UV. Autumn (Sep–Nov) averages 22/14°C — Pleasant autumn. Light jacket + sweater. Winter (Dec–Feb) averages 9/3°C — Still cool. Warm coat + sweater.
What is the weather in Jeju Island this month (June)? +
June averages 24°C high / 18°C low with 200mm rainfall over about 11 rainy days. Crowds are moderate and prices are moderate.
Keep Planning Your Jeju Island Trip
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.