Asia › South Korea › Jeju
30-year normals (1991-2020)
Jeju has a oceanic/humid subtropical climate, classified as Cfa in the Köppen system. The warmest month is August with an average high of 28°C, while the coldest month is January with lows dropping to 4°C. The annual temperature range of 24°C reflects moderate seasonal variation.
The driest month is October with only 7 rain days and 92mm of precipitation. For travellers, October through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 70% to 70% throughout the year.
Based on temperature and rainfall data, the best months to visit Jeju are April, October, May. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
Full Best Time to Visit GuideWarmest Month
28°C
August
Coldest Month
4°C
January
Driest Month
7 days
October
Annual Range
24°C
4° to 28°
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 7°C | 4°C | 9 | 5h | View |
| February | 8°C | 4°C | 8 | 7h | View |
| March | 11°C | 7°C | 10 | 8h | View |
| April | 16°C | 11°C | 9 | 9h | View |
| May | 20°C | 15°C | 10 | 9h | View |
| June | 23°C | 19°C | 13 | 8h | View |
| July | 27°C | 24°C | 16 | 9h | View |
| August | 28°C | 25°C | 17 | 10h | View |
| September | 25°C | 22°C | 13 | 8h | View |
| October | 20°C | 17°C | 7 | 9h | View |
| November | 15°C | 11°C | 8 | 7h | View |
| December | 10°C | 6°C | 8 | 6h | View |
January
9 rain days, 5h sun
February
8 rain days, 7h sun
March
10 rain days, 8h sun
April
9 rain days, 9h sun
May
10 rain days, 9h sun
June
13 rain days, 8h sun
July
16 rain days, 9h sun
August
17 rain days, 10h sun
September
13 rain days, 8h sun
October
7 rain days, 9h sun
November
8 rain days, 7h sun
December
8 rain days, 6h sun
Jeju in August
Data Sources for Jeju
Climate normals represent 30-year averages (1991-2020). Individual years may vary.