October 18 is generally a great time to visit Jeju Island. While there is a slight chance of rain (18%), showers are usually brief. Expect comfortable 20°C weather. Jeju Island is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Jeju Island
Currency
KRW
₩ South Korean won
Language
Korean
Driving
Right side
Safety
High Safety
GPI: 1.779
Jeju Island Weather Forecast for October 18
"Mild & Comfortable. Expect average highs of 20.2°C. 18% chance of rain."
What to Wear in Jeju Island in October
Based on historical data for October 18, Jeju Island typically experiences temperatures between 16.2°C and 20.2°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (18% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Jeju Island
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
20.2°C
Daytime Peak
Average Low
16.2°C
Nighttime Low
Feels Like
20.2°C
☀️ Feels accurate
Rain Chance
18%
Avg 0.8mm if it rains
Cloud Cover
47%
Overcast
Pressure
1020 hPa
Low volatility
Jeju Island Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 47 min to burn
Type III-IV
🟡 71 min to burn
Type V-VI
🟢 118 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
15.4°C
Pleasant
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in South Korea
Flight Traffic
High
98/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~240
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Jeju Island
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:41
☀️ Noon
12:20
🌇 Sunset
17:59
⏱️ Daylight
11h 17m
Wind Speed
17.9 km/h
Gentle breeze
Sunshine
8.0 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Jeju Island
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Jeju Island
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
Typhoon Risk
Year-round risk present
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Jeju Island on October 18 averages 20.2°C with a 18% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Jeju Island Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
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📍 Is Jeju Island Worth Visiting on October 18?
Planning a trip to Jeju Island on October 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 20.2°C with a 18% historical precipitation risk.
✈️ Travel Logistics: Approximately 240 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 10 vaccinations are recommended for South Korea, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 25.5°C (tropical bath). Wave conditions are generally surfers only with heights around 1.52m.
📊 Historical Extremes: The hottest October 18 recorded in the last 30 years saw temperatures hit 27.2°C in 2024, while the coldest dropped to 8.1°C in 2021.