Jeju-do Island, South Korea: Annual Weather Averages
August is the hottest month in Jeju-do Island with an average temperature of 26.5°C (80°F) and the coldest is January at 6°C (43°F) with the most daily sunshine hours at 9 in August. The wettest month is July with an average of 328mm of rain. The best month to swim in the sea is in August when the average sea temperature is 28°C (82°F).
Average Temperature: Jeju-do Island
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 6 | 7 | 9 | 14 | 18 | 21 | 26 | 27 | 23 | 18 | 13 | 8 |
| °F | 43 | 44 | 48 | 56 | 64 | 70 | 78 | 80 | 73 | 64 | 55 | 46 |
Average High/Low Temperature: Jeju-do Island
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 8 | 9 | 12 | 17 | 21 | 24 | 28 | 29 | 25 | 21 | 16 | 10 |
| Low °C | 6 | 7 | 9 | 14 | 18 | 21 | 26 | 27 | 23 | 18 | 13 | 8 |
| High °F | 46 | 48 | 54 | 63 | 70 | 75 | 82 | 84 | 77 | 70 | 61 | 50 |
| Low °F | 43 | 44 | 48 | 56 | 64 | 70 | 78 | 80 | 73 | 64 | 55 | 46 |
Average Rainfall: Jeju-do Island
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 22 | 24 | 46 | 77 | 102 | 133 | 328 | 248 | 138 | 49 | 53 | 25 |
| Days | 12 | 10 | 12 | 11 | 12 | 13 | 12 | 12 | 12 | 7 | 9 | 11 |
Average Daily Sunshine Hours: Jeju-do Island
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 4 | 6 | 7 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 7 | 5 |
Average Sea Temperature: Jeju-do Island
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 15 | 14 | 14 | 15 | 17 | 21 | 25 | 28 | 26 | 23 | 20 | 18 |
| °F | 59 | 57 | 57 | 59 | 63 | 70 | 77 | 82 | 79 | 73 | 68 | 64 |