Jeju monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at Jeju
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 6.4 | 7.1 | 10.6 | 15.4 | 19.4 | 22.4 | 26.3 | 27.7 | 24.2 | 19.8 | 14.4 | 9.2 |
| °F | 43.5 | 44.8 | 51.1 | 59.8 | 66.8 | 72.4 | 79.3 | 81.9 | 75.6 | 67.7 | 57.8 | 48.5 |
Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.
Average rainfall & rainy days
The graph below shows the average rainfall and number of rainy days per month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 59 | 78 | 97 | 145 | 155 | 252 | 280 | 248 | 180 | 81 | 76 | 46 |
| inches | 2.3 | 3.1 | 3.8 | 5.7 | 6.1 | 9.9 | 11 | 9.8 | 7.1 | 3.2 | 3 | 1.8 |
| Rainy days | 12 | 11 | 11 | 11 | 10 | 13 | 14 | 12 | 11 | 8 | 9 | 11 |
Average annual rainfall in Jeju: 1858.0585mm (731.5 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in Jeju
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 4.4 | 5.2 | 6.5 | 7 | 7.5 | 6.5 | 6.5 | 7.8 | 6.8 | 7 | 5.8 | 4.6 |
Day / night temperatures
The graph below shows the daily range of temperatures for each month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | -0.1 | 0.3 | 3 | 7.4 | 11.5 | 15.9 | 20.9 | 21.7 | 17.6 | 12.1 | 6.8 | 2 |
| Max °C | 6.6 | 7.3 | 10.8 | 15.6 | 19.6 | 22.6 | 26.4 | 27.9 | 24.4 | 20 | 14.5 | 9.4 |
| Min °F | 31.8 | 32.5 | 37.4 | 45.4 | 52.7 | 60.6 | 69.7 | 71 | 63.6 | 53.8 | 44.2 | 35.7 |
| Max °F | 37.8 | 38.8 | 44.4 | 52.7 | 59.9 | 66.7 | 74.6 | 76.6 | 69.8 | 60.9 | 51.2 | 42.3 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 14.1 | 12.8 | 12.5 | 13.6 | 16.3 | 20.3 | 24.4 | 27.1 | 25.3 | 22.2 | 19.2 | 16.3 |
| °F | 57.3 | 55.1 | 54.5 | 56.5 | 61.3 | 68.6 | 75.8 | 80.8 | 77.5 | 72 | 66.5 | 61.4 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 16 | 16 | 15 | 14 | 11 | 11 | 11 | 11 | 12 | 12 | 14 | 15 |
| mph | 10 | 10 | 9 | 8 | 7 | 7 | 7 | 7 | 7 | 8 | 9 | 9 |
A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.
Relative humidity
The graph below shows the average relative humidity.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 69% | 69% | 69% | 74% | 76% | 83% | 86% | 82% | 78% | 71% | 70% | 70% |
Other monthly averages
Jeju weather stats
| Hottest month: | August | 27.7°C 81.9°F |
|---|---|---|
| Driest month: | December | 46mm 1.8ins |
| Sunniest month: | October | 7hrs |
| Coldest month: | January | 6.4°C 43.5°F |
| Wettest month: | July | 280mm 11ins |
| Warmest sea: | August | 27.1°C 80.8°F |
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