January 21 is generally a great time to visit Jeju Island. While there is a slight chance of rain (27%), showers are usually brief. Expect comfortable 8°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 January 21
"Mild & Comfortable. Expect average highs of 8°C. 27% chance of snow."
What to Wear in Jeju Island in January
Based on historical data for January 21, Jeju Island typically experiences temperatures between 3.8°C and 8°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. With a 27% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Jeju Island
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
8°C
Daytime Peak
Average Low
3.8°C
Nighttime Low
Feels Like
4.6°C
❄️ Slightly colder
Snow Chance
27%
Avg 1.9mm if it snows
Snowfall
0.2 cm
~27% chance
Pressure
1023.6 hPa
Low volatility
Jeju Island Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 84% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 267 min to burn
Type III-IV
🟡 401 min to burn
Type V-VI
🟢 668 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
3.5°C
Dry air
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Midday (11 AM - 3 PM) when warmest
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in South Korea
Flight Traffic
High
88/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~216
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Jeju Island
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:37
☀️ Noon
12:46
🌇 Sunset
17:54
⏱️ Daylight
10h 17m
Wind Speed
22 km/h
Moderate wind
Sunshine
5.0 hrs
Direct Sun (Cloud-free)
Humidity
73%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Jeju Island
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Jeju Island
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟢 Moderate
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
High pressure may reduce activity.
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 January 21 averages 8°C with a 27% precipitation probability. Wedding/Outdoor Event Score: 54/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
January 19
7.9°C • 19% rain
Score
58
January 15
7.8°C • 21% rain
Score
57
January 14
7.9°C • 25% rain
Score
56
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (January 21) in other destinations
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📍 Is Jeju Island Worth Visiting on January 21?
Planning a trip to Jeju Island on January 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 8°C with a 27% historical precipitation risk.
✈️ Travel Logistics: Approximately 216 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 15.9°C (polar plunge). Wave conditions are generally surfers only with heights around 1.56m.
📊 Historical Extremes: The hottest January 21 recorded in the last 30 years saw temperatures hit 16.7°C in 2021, while the coldest dropped to -0.2°C in 2022.