Jeju City, South Korea Climate
Temperature through the year
The normal daily high and low and the record for every date at Jeju, since 1951. The line marks today.
- Normal low
- Normal high
- Record high
- Record low
Normals for Sep 29
- Normal high
- 24°C
- Record high
- 29°Cin 2014
- Record low
- 14°Cin 1995
- Chance of a wet day
- 28%
- Daylight
- 11 h 55 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Record high | Record low | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 9°C | 22°C (1989) | -10°C (1984) | 56 mm | 9.3 | |
| February | 10°C | 25°C (2004) | -6°C (1977) | 62 mm | 8.5 | |
| March | 13°C | 28°C (2025) | -6°C (2004) | 99 mm | 9.3 | |
| April | 18°C | 30°C (2005) | 1°C (1985) | 126 mm | 9.0 | |
| May | 22°C | 32°C (1993) | 6°C (1973) | 140 mm | 9.3 | |
| June | 25°C | 35°C (1994) | 7°C (1993) | 195 mm | 12.0 | |
| July | 29°C | 43°C (1990) | 14°C (1984) | 239 mm | 15.5 | |
| August | 30°C | 43°C (1986) | 14°C (2002) | 273 mm | 18.6 | |
| September | 26°C | 35°C (2025) | 9°C (2006) | 180 mm | 9.0 | |
| October | 22°C | 31°C (2025) | 1°C (1993) | 81 mm | 6.2 | |
| November | 16°C | 28°C (2023) | -3°C (2004) | 72 mm | 9.0 | |
| December | 22°C (1987) | -6°C (1988) | 53 mm | 9.3 | ||
| Year | 1576 mm | 125 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1576 mm in a normal year, most in August.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Jeju City.
The muggiest month is August, when 100 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | 4°C | 77% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | 4°C | 75% | 99% | 1% | 0% | 0% | 0% | 0% |
| March | 5°C | 74% | 98% | 2% | 0% | 0% | 0% | 0% |
| April | 9°C | 79% | 81% | 18% | 2% | 0% | 0% | 0% |
| May | 14°C | 85% | 29% | 45% | 25% | 1% | 0% | 0% |
| June | 19°C | 89% | 0% | 7% | 39% | 40% | 13% | 0% |
| July | 23°C | 91% | 0% | 0% | 1% | 17% | 46% | 36% |
| August | 24°C | 85% | 0% | 0% | 0% | 10% | 33% | 57% |
| September | 20°C | 80% | 1% | 8% | 22% | 37% | 25% | 8% |
| October | 14°C | 74% | 33% | 34% | 23% | 8% | 2% | 0% |
| November | 10°C | 74% | 79% | 14% | 6% | 1% | 0% | 0% |
| December | 6°C | 76% | 98% | 1% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is October, with the sky 58 percent covered on average; the cloudiest is June, at 81 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is January, averaging 27.4 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 19, with 14 h 23 min of daylight; the shortest is Dec 20, with 9 h 55 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Jeju City in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
A record is the highest or lowest value on the date in every year the station has reported, back to 1951. It rests on one station, so a neighbor a few miles away can hold different ones.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Records: NOAA GHCN-Daily, station KSM00047184, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.