South Korea Jeju Island Weather in October — Climate Guide
October in Jeju Island is very-high
October is very-high for Jeju Island.
Korean honeymoon peak season — hotels at peak. Pleasant weather + Hallasan autumn foliage starting. Pre-November peak.
Travel score
Jeju Island October Weather Stats
Avg High
22°C
Avg Low
14°C
Rainy Days
7
100mm total
Sunshine
8h
Daily avg
Humidity
65%
moderate
UV Index
5
Moderate
Wind
8 km/h
Gusts 22
Sea Temp
21°C
swimming chilly
Crowds
Very busy
At attractions
October Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
22 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
22°C
Nighttime
14°C
Humidity and wind affect how the actual temperature feels.
Wind
8 km/h
Max gust 22 km/h
Activities Recommended for October
October Travel Pros & Cons
Pros
- 22°C ideal
- Hallasan autumn foliage start
- Clear skies
- Sea still warm-ish
Cons
- Korean honeymoon peak hotels triple
- Tourist crush
October Events & Festivals
- Korean honeymoon peak season
- Hallasan autumn foliage begin
Jeju Island in October — Full Picture
Korean honeymoon peak season — hotels at peak. Pleasant weather + Hallasan autumn foliage starting. Pre-November peak.
What to Wear & What to Pack
Pleasant autumn. Light jacket + sweater.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
16.7°C
9.7°C
9/mo
Summer (Jun·Jul·Aug)
27°C
21.3°C
11.7/mo
Autumn (Sep·Oct·Nov)
Current21.7°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 October Hotel Picks
Frequently Asked Questions
Is October a good time to visit Jeju Island?
Jeju Island in October is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Jeju Island in October?
Jeju Island October averages a high of 22°C and a low of 14°C.
Does it rain much in Jeju Island in October?
Jeju Island October averages 100mm of rainfall over about 7 rainy days.
What should I wear in Jeju Island in October?
Pleasant autumn. Light jacket + sweater.
What time are sunrise and sunset in Jeju Island in October?
Jeju Island October sunrise is 07:00 and sunset is 17:50, with 10h 50min of daylight.
What's the air quality like in Jeju Island in October?
Jeju Island October air quality (AQI) averages 35, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in Jeju Island in October?
In October, Jeju Island is great for Hallasan autumn foliage start, Seongsan + Manjanggul, Aewol cafés.
Is October peak season in Jeju Island?
Jeju Island October 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.