South Korea Jeju Island Weather in August — Climate Guide
August in Jeju Island is high
August is high for Jeju Island.
Hottest month + Korean summer holidays peak. Beach swimming peak. Aewol + Hyeopjae Beach packed.
Travel score
Jeju Island August Weather Stats
Avg High
29°C
Avg Low
24°C
Rainy Days
11
200mm total
Sunshine
7h
Daily avg
Humidity
78%
high
UV Index
10
Very high
Wind
8 km/h
Gusts 22
Sea Temp
26°C
swimming peak
Crowds
Very busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
22 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
33°C
Nighttime
25°C
Humidity and wind affect how the actual temperature feels.
Wind
8 km/h
Max gust 22 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Beach swimming peak
- Drier than July
- Korean honeymoon atmosphere
- Festival atmosphere
Cons
- 29°C+ peak heat
- Tourist crush peak
- Korean honeymoon hotels triple
August Events & Festivals
- Korean summer holidays peak (mid-August)
Jeju Island in August — Full Picture
Hottest month + Korean summer holidays peak. Beach swimming peak. Aewol + Hyeopjae Beach packed.
What to Wear & What to Pack
Hottest + post-monsoon. T-shirt + shorts + UV.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
16.7°C
9.7°C
9/mo
Summer (Jun·Jul·Aug)
Current27°C
21.3°C
11.7/mo
Autumn (Sep·Oct·Nov)
21.7°C
14.3°C
7.7/mo
Winter (Dec·Jan·Feb)
9.3°C
3.3°C
7.7/mo
Jeju Island Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 8° | 2° | 8d·60mm | 5h | 65% | 2 | Quiet | Low season | |
| 9° | 3° | 8d·65mm | 6h | 68% | 3 | Quiet | Low season | |
| 12° | 5° | 9d·90mm | 7h | 70% | 5 | Moderate | Shoulder | |
| April (Best) | 17° | 10° | 9d·100mm | 8h | 70% | 6 | Very busy | Peak |
| May (Best) | 21° | 14° | 9d·100mm | 9h | 75% | 7 | Very busy | Peak |
| 24° | 18° | 11d·200mm | 6h | 80% | 8 | Moderate | Shoulder | |
| 28° | 22° | 13d·280mm | 6h | 80% | 9 | Busy | Peak | |
| 29° | 24° | 11d·200mm | 7h | 78% | 10 | Very busy | Peak | |
| 26° | 19° | 9d·200mm | 7h | 75% | 7 | Busy | Peak | |
| October (Best) | 22° | 14° | 7d·100mm | 8h | 65% | 5 | Very busy | Peak |
| November (Best) | 17° | 10° | 7d·80mm | 7h | 60% | 3 | Busy | Peak |
| 11° | 5° | 7d·50mm | 6h | 60% | 2 | Moderate | Shoulder |
View Other Months
Jeju Island August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Jeju Island?
Jeju Island in August is high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Jeju Island in August?
Jeju Island August averages a high of 29°C and a low of 24°C.
Does it rain much in Jeju Island in August?
Jeju Island August averages 200mm of rainfall over about 11 rainy days.
What should I wear in Jeju Island in August?
Hottest + post-monsoon. T-shirt + shorts + UV.
What time are sunrise and sunset in Jeju Island in August?
Jeju Island August sunrise is 06:15 and sunset is 19:20, with 13h 5min of daylight.
What's the air quality like in Jeju Island in August?
Jeju Island August air quality (AQI) averages 35, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in Jeju Island in August?
In August, Jeju Island is great for Beach + Hyeopjae, Aewol coast cafés, Seongsan early morning.
Is August peak season in Jeju Island?
Jeju Island August crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Jeju Island
View Other Months
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.