Jeju weather in May
May in Jeju: nice, rainy, with very humid — one of the best months to visit.
#2 of 12 months in Jeju · #337 of 604 destinations to visit in May · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Jeju climate normals — May
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 16°C / 62°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 102 mm / 4 in | 🌧 rainy |
| Rainy days | 8 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 15°C / 58°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 13.9 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 71 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Jeju in May — FAQ
- Is May a good time to visit Jeju?
- May in Jeju: nice, rainy, with very humid — one of the best months to visit. It ranks #2 of 12 months for Jeju on SeasonMap's comfort score (80/100).
- What is the weather like in Jeju in May?
- In May, Jeju averages a daily high of 20.7°C and a low of 16.4°C, with about 101.9 mm of rain over roughly 7.8 rainy days.
- What is the air quality in Jeju in May?
- Jeju has a mean US Air Quality Index of about 71 in May.