Skip to main content

 Climates to travel
 World climate guide
 
 
 Home
 Africa
 N.America
 S.America
 Antarctica
 Asia
 Caribbean
 Europe
 M.East
 Oceania
 All the countries
 Home
 Africa
 N.America
 S.America
 Antarctica
 Asia
 Caribbean
 Europe
 M.East
 Oceania
 All the countries

Climate - Jeju (South Korea)


Average weather, temperature, rainfall, sunshine hours

Flag - South Korea

Jeju, where it's located


You are here: Home --> Asia --> South Korea --> Jeju



The climate of Jeju (Jeju-do), an island located to the south of Korea, is temperate humid, with quite mild winters and hot, muggy and rainy summers. Like the rest of Korea, the island is affected by the monsoon circulation: in winter, the northwest cold currents prevail (which are initially dry, but before they reach the island, they have to pass above a stretch of sea quite large), while in summer, hot and humid currents of tropical origin prevail. Spring and autumn are transitional periods, mild and pleasant, especially the month of October.
The rains are plentiful, in fact they amount to 1,500 millimeters (60 inches) per year on the northern coast (the most sheltered, at least in the warm season, which is dominated by southern currents), while they reach 1,900 mm (75 in) on the southern and eastern coasts.
Owing to both the southern location and the influence of the sea, winter in Jeju-do is milder than in the Korean peninsula, but it is also rainier, in addition, the wind can heighten the feeling of cold. There are quite mild periods, with highs above 10 °C (50 °F), which alternate with cold periods, with wind and rain, highs around 5/7 °C (41/45 °F) or less, and possible falls of sleet or snow. However, snowfalls are typically light, as well as night frosts. In January 2016, there has been an unusual snowfall of 12 centimeters (4.7 in), the most abundant since 1984, which led to the closure of the airport, and at night, the temperature dropped to -5.8 °C (21.6 °F).
Summer is hot and humid, though fortunately the sea breeze blows, relieving the heat. There can be periods of good weather, with highs about 32/34 °C (90/93 °F), tropical nights and high humidity, but also periods of bad weather due to the summer monsoon.
Here are the temperatures of Jeju City, located on the northern coast, where the airport is also located.
Jeju City - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January496.2394743.1
February4107395044.5
March71310445649.9
April111814.4516457.9
May152218.6597265.4
June192522667771.6
July242926.5758579.7
August253027.4778681.4
September212623.5707974.3
October162218.6607165.6
November101613.4516256.1
December6118.3425246.9
Year13.419.316.3556.166.861.5

Here is the average rainfall in Jeju City.
Jeju City - Average precipitation
MonthMillimetersInchesDays
January702.812
February552.210
March903.510
April903.59
May953.710
June1706.712
July2108.312
August27010.613
September2309.111
October953.77
November702.810
December552.212
Year150059.1128

Here are the temperatures of Seogwipo, located on the southern coast. As you can see, the temperatures are slightly milder.
Seogwipo - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January4117.4395145.4
February5128.3415346.9
March81511.1465852
April121915.1536559.2
May162219607266.3
June202522.1677671.8
July242826758378.9
August253027.5778681.5
September222724.4718176
October162420627467.9
November111814.8526558.6
December6139.6435649.4
Year1420.417.1557.268.663

And here is the average rainfall in Seogwipo. As mentioned, the rains are more abundant on the southern coast.
Seogwipo - Average precipitation
MonthMillimetersInchesDays
January602.410
February803.110
March1305.110
April1857.310
May2258.911
June27010.613
July27510.814
August31512.414
September2108.311
October1003.96
November853.38
December552.29
Year199078.3125

The amount of sunshine in Jeju is not excellent, however, there are two peaks, one in spring (April-May) and the other in autumn (October). The cloudiest period is the first part of the rainy season (June-July). On the south coast, winter is a fairly sunny season, as you can see in the table concerning the hours of sunshine per day in Seogwipo.
Seogwipo - Sunshine hours
MonthAverageTotal
January5155
February5.5160
March6185
April6.5195
May6.5205
June4.5135
July4.5145
August6190
September6175
October6.5210
November5.5165
December5160
Year5.72075

However, in the north of the island, directly exposed to the winter monsoon, the sky is often cloudy even in this season.
Jeju City - Sunshine hours
MonthAverageTotal
January2.570
February4110
March5.5165
April6.5195
May7210
June5.5160
July6190
August6.5195
September5.5160
October5.5175
November4125
December2.580
Year51835

On the island of Jeju, the sea is warm enough for swimming from July to September, with a maximum in August. Here are the average sea temperatures.
Jeju City - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January1457
February1355
March12.554
April13.556
May16.561
June20.569
July24.576
August2781
September25.578
October2272
November1967
December16.561
Year18.765.7

Jeju in spring

The interior of the island is occupied by a mountain, Mount Halla, an extinct volcano of 1,950 meters (6,398 feet), which is also the highest mountain of Korea. The area is protected in the Hallasan National Park.
Here are the average temperatures of Witse Oreum, 1,672 meters (5,486 ft) above sea level, where the roads at the base of the volcano end.
Witse Oreum - Average temperatures (2003-2009)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January-9-2-5.4162922.4
February-81-3.3183426.1
March-53-0.8233830.5
April1105.4335041.6
May61510.3425950.5
June101814.2516557.6
July152017.5586963.5
August142117.6586963.6
September111814.6526558.2
October4138.8405647.8
November-172.9304437.3
December-70-3.3203226.1
Year2.710.46.5536.950.844

Mount Halla is rain-soaked: up to 4,700 mm (185 in) of rain fall per year; rainfall exceeds 300 mm (12 in) per month from May to October, with a maximum of as high as 835 mm (33 in) in August. Although the winter is the driest season, there is still room for heavy snowfalls, so the top can remain snow-capped also in spring. Tourists on the mountain slopes go skiing (though there are no lifts, and skiing is actually forbidden), and sledding. Here is the average precipitation.
Witse Oreum - Average precipitation
MonthMillimetersInchesDays
January451.8
February1305.1
March30011.8
April42516.7
May65525.8
June65025.6
July74029.1
August83532.9
September52520.7
October1254.9
November1656.5
December652.6
Year4670183.9

On the island, the characteristic Dol hareubang ("Stone grandfathers"), basalt statues, up to 3 meters (10 feet) high, are found.

Stone grandfathers in the Jeju Stone Park

From July to early October (and occasionally, also in the second half of June), Jeju can be affected by typhoons, the tropical cyclones of south-east Asia, which can bring strong winds and torrential rains, as happened for example with typhoon Maemi in September 2003, typhoon Sanba in September 2012, and typhoon Chaba in early October 2016. 2016.

Best Time



The best times to visit Jeju Island are spring and autumn, and in particular from mid-April to late May and mid-October to mid-November. In summer, temperatures are milder in the mountains, but the rains are abundant and typhoons can pass.


© Copyright Climatestotravel.com. 

Back to Asia --> South Korea

All the countries


Share this page:
Facebook Twitter LinkedIn Whatsapp Email



 Continents:
 Africa
 North America
 South America
 Antarctica
 Asia
 Caribbean
 Europe
 Middle East
 Oceania

Search in the website:

Home About Contact Us Link Policy
Home
About
Contact Us
Link
Policy