Weather in Jeju 🇰🇷
Monthly weather averages & travel planning
May
Avg Temp
23°C
Rain Days
6 days
Sun Hours
7 hrs
Humidity
65%
Asia › 🇰🇷 South Korea › Jeju
Updated: March 2026
Is May a Good Time to Visit Jeju?
6/10
Good
May is a good time to visit Jeju (6/10). With 7 daily sunshine hours and only 6 rain days, this month delivers genuinely reliable outdoor conditions, ranking it the sunniest month of the year in Jeju. Culture-focused travellers and those who prefer lighter crowds will find May a practical choice, with prices running lower than peak May without sacrificing all the good weather. June 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 April:20°C avg high
Jeju in May rewards travelers with average highs of 23°C and overnight lows around 15°C. Expect around 6 rainy days, making it one of the drier periods in the city. With 7 daily sunshine hours on average, conditions are comfortable for sightseeing at a relaxed pace.
23°C
73°F
Avg High
15°C
59°F
Avg Low
6 days
67 mm total
Rain Days
7h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Jeju in May
The 8°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 9 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Wind averages 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 73°F average high, 59°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 May
Morning15°CBefore the day warms up
Afternoon23°CPeak daytime temperature
Evening18°CAfter sunset cools down
Packing for Jeju in May means dressing for 23°C days and 15°C evenings. A light cotton tee with a casual overshirt works well at 23°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 15°C, a modest 8°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. For temple and religious site visits, carry a lightweight scarf or sarong to cover shoulders and knees, required at most major sites across the region.
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 May
May 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 May
Based on 23°C average highs and 6 rainy days
- Light layers for morning and evening
- Breathable T-shirts and comfortable trousers
- UV-protective sunglasses
- SPF 30+ sunscreen
- 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 May
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 23°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)May is reliably dry enough for rural day trips without weather risk
- 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 morningMay brings distinct seasonal changes to public green spaces worth exploring
- Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmMay seasonal produce is at peak availability, offering dishes not found at other times of year
Why is Jeju mild in May?
Jeju's May heat is driven by the Asian summer monsoon system, as the low-pressure cell that forms over the heated landmass draws warm, humid air from the oceans. The result is temperatures averaging 23°C with high moisture in the air. Overnight temperatures remain elevated at 15°C, as clouds and humidity prevent the earth from radiating heat away after sunset. 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 May
In May, Jeju experiences average highs of 23°C (73°F) and lows of 15°C (59°F). Expect around 6 rainy days and 7 hours of sunshine per day, with humidity averaging 65%. The 8°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Jeju typically sees 6 rainy days in May, with total precipitation of around 67mm. This makes May one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Jeju typically sees 4-6 fewer rain days than May.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Jeju in May. Daytime temperatures of 23°C are pleasant, but the evening drop to 15°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 6 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
May is a reasonable time to visit Jeju. Expect 6 rainy days, so pack a light rain layer for flexibility. Average temperatures of 23°C make outdoor exploration comfortable during the dry periods. With 7 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 May is 23°C (73°F), and the average low is 15°C (59°F). The mean daily temperature is approximately 19°C (66°F). The day-to-night range of 8°C is moderate, meaning a single light jacket covers most situations. 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 May. May offers the most sunshine at 7 hours per day and only 6 rainy days. Average temperatures reach 23°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around May gives you the best chance of dry, bright weather.
May is shoulder or low season in Jeju, meaning fewer tourists and generally lower prices than peak months. With 7 sunshine hours and 6 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 May, Jeju suits a range of activities thanks to mild temperatures around 23°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 7 hours of sunshine, parks and waterfront walks are particularly enjoyable.
May ranks 1st sunniest of the year in Jeju, with an average 7 daily sunshine hours. The driest months are January, February, and October. June is the hottest month (25°C avg high); December is the coolest (7°C). From here, temperatures rise 2°C into June. Compared to last month (April: 20°C high, 5 rain days), May is warmer and wetter. May is among the top three sunniest months to visit Jeju.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 8°C | 0°C | 3 | 1h | View |
| February | 12°C | 4°C | 3 | 3h | View |
| March | 16°C | 8°C | 4 | 4h | View |
| April | 20°C | 12°C | 5 | 6h | View |
| May | 23°C | 15°C | 6 | 7h | View |
| June | 25°C | 17°C | 6 | 7h | View |
| July | 23°C | 15°C | 6 | 7h | View |
| August | 20°C | 12°C | 5 | 6h | View |
| September | 16°C | 8°C | 4 | 4h | View |
| October | 12°C | 4°C | 3 | 3h | View |
| November | 8°C | 0°C | 3 | 1h | View |
| December | 7°C | -1°C | 3 | 1h | View |
January
3 rain days, 1h sun
8°0°
February
3 rain days, 3h sun
12°4°
March
4 rain days, 4h sun
16°8°
April
5 rain days, 6h sun
20°12°
May
6 rain days, 7h sun
23°15°
June
6 rain days, 7h sun
25°17°
July
6 rain days, 7h sun
23°15°
August
5 rain days, 6h sun
20°12°
September
4 rain days, 4h sun
16°8°
October
3 rain days, 3h sun
12°4°
November
3 rain days, 1h sun
8°0°
December
3 rain days, 1h sun
7°-1°
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.