Jeju City climate
Jeju City (South Korea) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 16 °C62 °F, and about 1,579 mm62 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Jeju City climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 948 | 644 | 846 | 502.0 |
| Feb | 1049 | 744 | 847 | 652.6 |
| Mar | 1253 | 947 | 1050 | 903.5 |
| Apr | 1559 | 1253 | 1356 | 1365.4 |
| May | 1865 | 1660 | 1762 | 1415.6 |
| Jun | 2271 | 2068 | 2169 | 1927.6 |
| Jul | 2678 | 2476 | 2577 | 2409.5 |
| Aug | 2882 | 2679 | 2781 | 26110 |
| Sep | 2576 | 2373 | 2475 | 1857.3 |
| Oct | 2169 | 1865 | 2067 | 893.5 |
| Nov | 1661 | 1356 | 1558 | 722.8 |
| Dec | 1152 | 847 | 1050 | 562.2 |
| Year | 2882 | 644 | 1662 | 1,57962 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 78% | 2.1 | 10:09 |
| Feb | 75% | 74% | 2.9 | 10:56 |
| Mar | 74% | 69% | 4.1 | 11:53 |
| Apr | 79% | 70% | 4.8 | 12:59 |
| May | 85% | 73% | 5.1 | 13:53 |
| Jun | 89% | 81% | 4.6 | 14:22 |
| Jul | 90% | 74% | 4.8 | 14:10 |
| Aug | 84% | 67% | 5.0 | 13:23 |
| Sep | 81% | 68% | 4.1 | 12:20 |
| Oct | 74% | 59% | 3.7 | 11:17 |
| Nov | 74% | 66% | 2.6 | 10:22 |
| Dec | 76% | 77% | 1.9 | 9:56 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Jeju City is like
The warmest month is August, with an average high of 28 °C82 °F and a low of 26 °C79 °F. The coldest is January, when highs average 9 °C48 °F and lows 6 °C44 °F. Seasons are strongly marked: the warmest month is on average 19.4 °C34.9 °F warmer than the coldest.
It is wet, with about 1,579 mm62 in of precipitation per year. The wettest three-month stretch is June–August, which brings 44% of the annual total. The wettest month is August (261 mm10 in), the driest is January (50 mm2.0 in).
Relative humidity ranges from 74% in November to 90% in July. The clearest skies (lowest average cloud amount, 59%) are typical of October. Average wind speed near the ground ranges from 13 km/h (8 mph) in June to 24 km/h (15 mph) in January. Daylight lasts from about 9.9 hours in December to 14.4 hours in June.
Best time to visit Jeju City
Based on these averages, the most comfortable months for sightseeing and outdoor activities are October: average highs of 21 °C69 °F to 21 °C69 °F with 89 mm3.5 in to 89 mm3.5 in of precipitation per month.
The most challenging month is July, which is very wet (240 mm9.5 in) and humid (90% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Jeju City
- Winter (December–February) — highs 948 to 11 °C52 °F, lows 644 to 8 °C47 °F, about 57 mm2.3 in of precipitation a month. Pack a warm coat, layers and closed shoes.
- Spring (March–May) — highs 1253 to 18 °C65 °F, lows 947 to 16 °C60 °F, about 122 mm4.8 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Summer (June–August) — highs 2271 to 28 °C82 °F, lows 2068 to 26 °C79 °F, about 231 mm9.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 1661 to 25 °C76 °F, lows 1356 to 23 °C73 °F, about 115 mm4.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Jeju City compares
Compared with Gwangju, about 186 km to the north, Jeju City is on average 3.5 °C6.2 °F warmer and receives 14% more precipitation (1,579 mm62 in vs 1,381 mm54 in). The difference is largest in December (7.8 °C14.1 °F warmer).
Of the 34 places in South Korea covered by World Climates, Jeju City is the warmest by annual mean temperature and the wettest by annual precipitation. See all of them on the South Korea climate page.
Places in other countries with the most similar temperature and rainfall pattern: Kitakyushu (Japan, Cfa), Kure (Japan, Cfa) and Matsuyama (Japan, Cfa).
The same NASA POWER grid cell also contains Seogwipo (pop. 178,552). Their long-term averages in this dataset are essentially the same as for Jeju City, so they do not have separate pages.
Nearby places
- Mokpo 145 km · 14 °C56 °F · 1,292 mm51 in
- Suncheon 183 km · 13 °C56 °F · 1,408 mm55 in
- Gwangju 186 km · 13 °C55 °F · 1,381 mm54 in
- Jeongeup 235 km · 13 °C55 °F · 1,303 mm51 in
- Chinju 236 km · 14 °C57 °F · 1,472 mm58 in
- Geoje 248 km · 14 °C58 °F · 1,488 mm59 in
- Jeonju 263 km · 12 °C54 °F · 1,267 mm50 in
- Iksan 274 km · 13 °C55 °F · 1,267 mm50 in
Frequently asked questions
What is the warmest month in Jeju City?
August is the warmest month in Jeju City, with an average high of 28 °C (82 °F) and an average low of 26 °C (79 °F).
What is the coldest month in Jeju City?
January is the coldest month, with an average high of 9 °C (48 °F) and an average low of 6 °C (44 °F).
When does it rain the most in Jeju City?
August is the wettest month with about 261 mm (10.3 in) of precipitation; January is the driest with about 50 mm (2.0 in).
What is the best time to visit Jeju City?
Judging by long-term averages, the most comfortable months are October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.