Jeju Island: Weather Guide & Climate
Complete month-by-month weather guide: Jeju Island. Best time to visit: April, May, September, October. Plan your trip with detailed climate data.
☀️ Climate Overview
Jeju Island has a Warm climate with average yearly highs of 20°C, lows of 15°C, and approximately 11 rainy days per month.
The best time to visit Jeju Island is during April, May, September, October, when temperatures are comfortable and rainfall is moderate
Drier season: Jan–Dec Wetter season: Mar–Sep
Now
--
Air Quality
Hottest
Coldest
Driest Month
Windiest Month
22 km/h
December (gusts 46)
Sea Temp Range
14° – 30°C
Warmest water: August (30°C)
Best for swimming: Jun, Jul, Aug, Sep, Oct, Nov (21°–30°C)
Forecast for your trip dates
Up to 14 days aheadWeather by Season
Spring
Mar–May
Summer
Jun–Aug
Autumn
Sep–Nov
Winter
Dec–Feb
Month-by-Month Weather Table
January
February
March
April
BestMay
BestJune
July
August
September
BestOctober
BestNovember
December
| Month | High | Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition | View Details |
|---|---|---|---|---|---|---|---|---|---|
| January | 10°C | 5°C | 9d (59mm) | 5.7h | 70% Humid | 3.3 Moderate | | Good | View Details → |
| February | 10°C | 6°C | 9d (79mm) | 6.3h | 71% Humid | 4.4 Moderate | | Good | View Details → |
| March | 14°C | 9°C | 10d (98mm) | 7.6h | 72% Humid | 6.2 High | | Good | View Details → |
| April (best) | 18°C | 12°C | 8d (93mm) | 8.9h | 72% Humid | 7.8 Very High | | Excellent | View Details → |
| May (best) | 21°C | 16°C | 9d (129mm) | 9.2h | 77% Humid | 8.2 Very High | | Excellent | View Details → |
| June | 25°C | 21°C | 13d (213mm) | 8h | 85% Very Humid | 7.2 Very High | | Wet | View Details → |
| July | 29°C | 25°C | 18d (254mm) | 8.4h | 87% Very Muggy | 6.8 High | | Wet | View Details → |
| August | 30°C | 26°C | 19d (177mm) | 9.9h | 83% Very Muggy | 7.1 Very High | | Wet | View Details → |
| September (best) | 28°C | 24°C | 17d (275mm) | 7.9h | 81% Very Humid | 5.6 High | | Excellent | View Details → |
| October (best) | 22°C | 18°C | 7d (48mm) | 8.2h | 72% Humid | 5.2 High | | Excellent | View Details → |
| November | 17°C | 13°C | 7d (97mm) | 6.9h | 70% Humid | 3.9 Moderate | | Good | View Details → |
| December | 11°C | 7°C | 7d (31mm) | 5.8h | 68% Humid | 3 Moderate | | Good | View Details → |
Jeju Island
Volcanic island, including waterfalls, Hallasan Mountain hike and Seongsan Sunrise Peak, lava tubes, beaches, and Hallasan crater.
View Full Destination Guide
Ready to Plan Your Jeju Island Trip?
Get strategic travel tips, seasonal insights, and expert recommendations.
Frequently Asked Questions
What type of climate does Jeju Island have?
When is the best time to visit Jeju Island?
What are the hottest and coldest months in Jeju Island?
When is the rainy season in Jeju Island?
Does it get cold at night in Jeju Island?
Can you swim year-round in Jeju Island?
More Jeju Island Guides
Best Time to Visit
Coming soon
Things to Do
Coming soon
Where to Stay
Best neighborhoods and hotel recommendations
Cost & Budget
Daily costs, money-saving tips, and budget breakdown
Itineraries
Coming soon
Overview
Complete travel guide for Jeju Island: top things to do, itineraries, and typical costs.