Jeju weather in August
August in Jeju: sweltering, soaked, with very humid — a great time to visit.
#3 of 12 months in Jeju · #321 of 604 destinations to visit in August · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Jeju climate normals — August
| Daytime high | 30°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 151 mm / 5.9 in | ⛈ soaked |
| Rainy days | 13 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 25°C / 77°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 13.4 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 84 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Jeju in August — FAQ
- Is August a good time to visit Jeju?
- August in Jeju: sweltering, soaked, with very humid — a great time to visit. It ranks #3 of 12 months for Jeju on SeasonMap's comfort score (78/100).
- What is the weather like in Jeju in August?
- In August, Jeju averages a daily high of 29.5°C and a low of 26.5°C, with about 150.7 mm of rain over roughly 13.2 rainy days.
- What is the air quality in Jeju in August?
- Jeju has a mean US Air Quality Index of about 84 in August.