Weather in Jeju 🇰🇷
Monthly weather averages & travel planning
December
Avg Temp
10°C
Rain Days
8 days
Sun Hours
6 hrs
Humidity
70%
Asia › 🇰🇷 South Korea › Jeju
Updated: March 2026
Is December a Good Time to Visit Jeju?
5/10
Fair
December is a fair time to visit Jeju (5/10). Average highs of 10°C and 6 sunshine hours daily make conditions workable, though not exceptional. Culture-focused travellers and those who prefer lighter crowds will find December a practical choice, with prices running lower than peak August without sacrificing all the good weather. January offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Jeju's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.
vs November:15°C avg high
Jeju in December rewards travelers with average highs of 10°C and overnight lows around 6°C. Expect around 8 rainy days, so a compact umbrella is worth carrying. With 6 daily sunshine hours on average, conditions are cool and bracing, well suited for active days on foot.
10°C
50°F
Avg High
6°C
43°F
Avg Low
8 days
59 mm total
Rain Days
6h
per day avg
Sunshine
70%
Moderate
Humidity
Temperature in Jeju in December
The narrow 4°C gap between daytime and overnight temperatures, characteristic of coastal cities with maritime moderation, means a single mid-layer works across the whole day. Humidity averages 70%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. The UV index of 2 is low, meaning sun exposure is minimal concern and sunscreen is largely optional. Wind averages 22 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 50°F average high, 43°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Jeju in December
Morning6°CBefore the day warms up
Afternoon10°CPeak daytime temperature
Evening9°CAfter sunset cools down
Packing for Jeju in December means dressing for 10°C days and 6°C evenings. Layering is key: a thermal base, mid-layer fleece, and a windproof outer jacket for 10°C highs that feel colder in the wind. Evening temperatures settle at 6°C, a modest 4°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues.
Local tip: Temple and religious site visits require covered shoulders and knees in most of Jeju's heritage areas. A lightweight scarf or sarong weighs almost nothing and solves the problem instantly.
Events in Jeju in December
December has no major festivals or public holidays in Jeju, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Jeju in December
Based on 10°C average highs and 8 rainy days
- Warm jacket (down or fleece)
- Merino wool base layer (regulates temperature and resists odour)
- Sweaters and lined trousers
- Scarf and lightweight gloves
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Jeju in December
- Vigorous walking tour of the UNESCO heritage districtMidday (12-2pm)The 10°C peak temperature provides ideal conditions for brisk sightseeing walks
- Cycling the riverside or park circuitAfternoon (1-4pm)Cool dry air makes long cycling sessions comfortable without overheating
- Explore hilltop viewpoints and fortressesMorning for clear viewsCold-weather atmospheric clarity gives the longest sightlines of the year
- Open-air Christmas or seasonal marketsAfternoon into eveningCool temperatures make festive outdoor markets genuinely atmospheric
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningDecember brings distinct seasonal changes to public green spaces worth exploring
- Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months
Why is Jeju cool in December?
December in Jeju reflects a mid-latitude climate pattern, with temperatures averaging 10°C by day and 6°C overnight. The city sits at 33 degrees north latitude, where the balance between solar radiation and heat loss drives conditions that are neither extreme nor static. Conditions occupy the comfortable middle band of the annual temperature range, where outdoor activity is feasible without the extremes of midsummer heat or midwinter cold. Day-to-night temperature variation of 4°C is small, typical of maritime-influenced climates. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Jeju in December
In December, Jeju experiences average highs of 10°C (50°F) and lows of 6°C (43°F). Expect around 8 rainy days and 6 hours of sunshine per day, with humidity averaging 70%. The 4°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV exposure is moderate at index 2.
Jeju typically sees 8 rainy days in December, with total precipitation of around 59mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Jeju typically sees 4-6 fewer rain days than December.
Pack a warm jacket, sweaters, and layering pieces for Jeju in December. Temperatures can drop to 6°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is a sensible precaution even though rain days are limited. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.
December is a reasonable time to visit Jeju. Expect 8 rainy days, so pack a light rain layer for flexibility. Average temperatures of 10°C make outdoor exploration comfortable during the dry periods. With 6 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Jeju in December is 10°C (50°F), and the average low is 6°C (43°F). The mean daily temperature is approximately 8°C (46°F). The day-to-night range of 4°C is narrow, typical of coastal or maritime cities. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Jeju is generally April. April offers the most sunshine at 9 hours per day and only 9 rainy days. Average temperatures reach 16°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around April gives you the best chance of dry, bright weather.
December is shoulder or low season in Jeju, meaning fewer tourists and generally lower prices than peak months. With 6 sunshine hours and 8 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In December, Jeju suits a range of activities thanks to cool conditions around 10°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. Cosy cafes and cultural venues make ideal retreats on overcast days.
December ranks 11th sunniest of the year in Jeju, with an average 6 daily sunshine hours. The driest months are October, February, and November. August is the hottest month (28°C avg high); January is the coolest (7°C). From here, temperatures fall 3°C into January. Compared to last month (November: 15°C high, 8 rain days), December is cooler and equally dry. December is one of the least sunny months, but that often means lower prices and fewer fellow tourists.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 7°C | 4°C | 9 | 5h | View |
| February | 8°C | 4°C | 8 | 7h | View |
| March | 11°C | 7°C | 10 | 8h | View |
| April | 16°C | 11°C | 9 | 9h | View |
| May | 20°C | 15°C | 10 | 9h | View |
| June | 23°C | 19°C | 13 | 8h | View |
| July | 27°C | 24°C | 16 | 9h | View |
| August | 28°C | 25°C | 17 | 10h | View |
| September | 25°C | 22°C | 13 | 8h | View |
| October | 20°C | 17°C | 7 | 9h | View |
| November | 15°C | 11°C | 8 | 7h | View |
| December | 10°C | 6°C | 8 | 6h | View |
January
9 rain days, 5h sun
7°4°
February
8 rain days, 7h sun
8°4°
March
10 rain days, 8h sun
11°7°
April
9 rain days, 9h sun
16°11°
May
10 rain days, 9h sun
20°15°
June
13 rain days, 8h sun
23°19°
July
16 rain days, 9h sun
27°24°
August
17 rain days, 10h sun
28°25°
September
13 rain days, 8h sun
25°22°
October
7 rain days, 9h sun
20°17°
November
8 rain days, 7h sun
15°11°
December
8 rain days, 6h sun
10°6°
Other Months in Jeju
Plan Your Trip to Jeju
Nearby Destinations
Cities within 500 km with comparable weather conditions
Data Sources for Jeju
Climate normals represent 30-year averages (1991-2020). Individual years may vary.