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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 30°C, while the coldest is January averaging around 3°C at night. Precipitation totals about 1603 mm a year and is strongly seasonal — August alone averages 314 mm while December barely receives 56 mm.
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 (°C) | 8 | 10 | 13 | 18 | 22 | 25 | 29 | 30 | 26 | 22 | 16 | 11 |
| Avg temp (°C) | 6 | 7 | 10 | 14 | 18 | 22 | 26 | 27 | 23 | 18 | 13 | 8 |
| Avg low (°C) | 3 | 4 | 6 | 10 | 15 | 19 | 23 | 25 | 21 | 15 | 10 | 5 |
| Precipitation (mm) | 68 | 60 | 92 | 90 | 103 | 183 | 218 | 314 | 245 | 99 | 74 | 56 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 10 | 13 | 18 | 22 | 25 |
| Avg temp (°C) | 6 | 7 | 10 | 14 | 18 | 22 |
| Avg low (°C) | 3 | 4 | 6 | 10 | 15 | 19 |
| Precipitation (mm) | 68 | 60 | 92 | 90 | 103 | 183 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 26 | 22 | 16 | 11 |
| Avg temp (°C) | 26 | 27 | 23 | 18 | 13 | 8 |
| Avg low (°C) | 23 | 25 | 21 | 15 | 10 | 5 |
| Precipitation (mm) | 218 | 314 | 245 | 99 | 74 | 56 |
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.