Home › Cities › South Korea › Jeju City
Jeju City, South Korea climate
Cfa Humid subtropical
Jeju City has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 86°F, while the coldest is January averaging around 38°F at night. Precipitation totals about 63 inches a year and is strongly seasonal — August alone averages 12.4 inches while December barely receives 2.19 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Jeju City climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 47 | 49 | 56 | 64 | 71 | 77 | 85 | 86 | 79 | 71 | 61 | 51 |
| Avg temp (°F) | 43 | 44 | 49 | 57 | 65 | 71 | 79 | 81 | 74 | 65 | 56 | 47 |
| Avg low (°F) | 38 | 39 | 43 | 51 | 58 | 66 | 74 | 76 | 69 | 60 | 50 | 42 |
| Precipitation (in) | 2.7 | 2.4 | 3.6 | 3.6 | 4.0 | 7.2 | 8.6 | 12.4 | 9.7 | 3.9 | 2.9 | 2.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 47 | 49 | 56 | 64 | 71 | 77 |
| Avg temp (°F) | 43 | 44 | 49 | 57 | 65 | 71 |
| Avg low (°F) | 38 | 39 | 43 | 51 | 58 | 66 |
| Precipitation (in) | 2.7 | 2.4 | 3.6 | 3.6 | 4.0 | 7.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 86 | 79 | 71 | 61 | 51 |
| Avg temp (°F) | 79 | 81 | 74 | 65 | 56 | 47 |
| Avg low (°F) | 74 | 76 | 69 | 60 | 50 | 42 |
| Precipitation (in) | 8.6 | 12.4 | 9.7 | 3.9 | 2.9 | 2.2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 75 | 72 | 72 | 74 | 81 | 73 | 65 | 66 | 58 | 65 | 75 |
| Relative humidity (%) | 77 | 75 | 74 | 79 | 85 | 89 | 90 | 85 | 80 | 74 | 74 | 76 |
| Wind speed (mph) | 14.8 | 14.1 | 12.8 | 10.7 | 9.1 | 8.1 | 9.4 | 10.0 | 10.9 | 11.9 | 12.4 | 14.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 75 | 72 | 72 | 74 | 81 |
| Relative humidity (%) | 77 | 75 | 74 | 79 | 85 | 89 |
| Wind speed (mph) | 14.8 | 14.1 | 12.8 | 10.7 | 9.1 | 8.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 65 | 66 | 58 | 65 | 75 |
| Relative humidity (%) | 90 | 85 | 80 | 74 | 74 | 76 |
| Wind speed (mph) | 9.4 | 10.0 | 10.9 | 11.9 | 12.4 | 14.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Jeju, a weather station, about 1 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.