Jeju Weather in May: What to Expect
In May, Jeju averages highs of 21.4°C and lows of 15.2°C, with about 11 rainy days (~145 mm). Verdict: Good — comfortable — manageable 21.4°C days. That makes it the 4th hottest of South Korea's 6 main cities this month.
Jeju vs other South Korea cities in May
South Korea is not one climate. In May, Gyeongju runs to 24.6°C while Incheon sits at 20.5°C — a 4°C spread. Here is where Jeju falls:
What to pack for Jeju in May
With highs near 21.4°C and lows around 15.2°C, pack layers — a light jacket for mornings and evenings, a compact umbrella or rain shell.
Jeju is on the coast — add swimwear; the water can feel cool for swimming this month.
What to do in Jeju in May
May's weather suits sightseeing through the day. Top sights:
Public holidays in South Korea, May
- 2026-05-01 — Labour Day
- 2026-05-05 — Children's Day
- 2026-05-25 — Buddha's Birthday
- 2027-05-03 — Labour Day
- 2027-05-05 — Children's Day
- 2027-05-13 — Buddha's Birthday
Jeju in May — FAQs
What is the weather like in Jeju in May?
In May, Jeju averages daytime highs of 21.4°C and overnight lows around 15.2°C, with roughly 11 rainy days and about 145 mm of rain across the month. Good — comfortable — manageable 21.4°C days.
Is May a good time to visit Jeju?
Good — comfortable. May is comfortable enough for full-day sightseeing in Jeju. Among South Korea's cities, Jeju is the 4th hottest this month.
What should I pack for Jeju in May?
For May (15.2–21.4°C), pack layers — a light jacket for mornings and evenings, a compact umbrella or rain shell.
What is there to do in Jeju in May?
Jeju's main sights include Jeju Volcanic Island and Lava Tubes, Hallasan National Park, Dadohaehaesang National Park. The weather suits visiting these comfortably through the day.
Are there public holidays in South Korea in May?
Yes — Labour Day (2026-05-01), Children's Day (2026-05-05), Buddha's Birthday (2026-05-25), Labour Day (2027-05-03), Children's Day (2027-05-05), Buddha's Birthday (2027-05-13). Sites can be busier or closed around these dates.
Jeju weather by month: