Jeju weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: April – June, September – October
What is the weather like in Jeju in May?
In May, Jeju is mild: daytime highs average 20 °C, and nights cool down to about 15 °C. The sea averages 16.5 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain is frequent, with about 9 rainy days and 132 mm in total. All in all, May is an excellent month for a holiday in Jeju.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 13 h 52 min05:34 – 19:26
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 64 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Seoul
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %63 %
- Few rainy daysweight 30 %63 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Jeju in May: quick answers
Is Jeju hot in May?
No. In May, Jeju is mild: daytime highs average 20 °C and nights drop to about 15 °C.
Can you swim in Jeju in May?
Only if you don't mind cold water: in May the sea averages just 16.5 °C. Comfortable swimming is possible from June to October.
Does it rain much in Jeju in May?
Rain is frequent, with about 9 rainy days and 132 mm in total.
Jeju month by month
The whole year in JejuAll destinations: South KoreaWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences