Jeju
South Korea
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Jeju, South Korea

A high sunrise Panorama of the Jeju Island in Jeju, South Korea
A high sunrise Panorama of the Jeju Island in Jeju, South Korea
January, the same as December, in Jeju, South Korea, is a frosty winter month, with average temperature fluctuating between 3.2°C (37.8°F) and 8.3°C (46.9°F). January is the coldest month, with an average high-temperature of 8.3°C (46.9°F) and an average low-temperature of 3.2°C (37.8°F). Weather in January »
February, the last month of the winter, in Jeju, is also a frosty month, with temperature in the range of an average low of 3.6°C (38.5°F) and an average high of 9.4°C (48.9°F). In Jeju, the average high-temperature is essentially the same as in January - a still chilly 9.4°C (48.9°F). Weather in February »

The first month of the spring, March, is a cool month in Jeju, South Korea, with average temperature ranging between min 6.1°C (43°F) and max 12.8°C (55°F). In March, the average high-temperature marginally rises, from a chilly 9.4°C (48.9°F) in February, to a fresh 12.8°C (55°F). Weather in March »

April in Jeju, South Korea, is a comfortable spring month, with average temperature ranging between min 10.2°C (50.4°F) and max 17.5°C (63.5°F). In April, the average high-temperature slightly increases, from a cool 12.8°C (55°F) in March, to an enjoyable 17.5°C (63.5°F). Weather in April »

The last month of the spring, May, is an agreeable month in Jeju, South Korea, with average temperature fluctuating between 14.4°C (57.9°F) and 21.6°C (70.9°F). In Jeju, the average high-temperature marginally rises, from an enjoyable 17.5°C (63.5°F) in April, to an agreeable 21.6°C (70.9°F). Weather in May »

The first month of the summer, June, is a warm month in Jeju, South Korea, with average temperature fluctuating between 24.8°C (76.6°F) and 18.7°C (65.7°F). In Jeju, the average high-temperature slightly increases, from an agreeable 21.6°C (70.9°F) in May, to a warm 24.8°C (76.6°F). Weather in June »

July, like June, in Jeju, South Korea, is a moderately hot summer month, with average temperature fluctuating between 23.3°C (73.9°F) and 29°C (84.2°F). In Jeju, South Korea, the average high-temperature slightly increases, from 24.8°C (76.6°F) in June, to a still moderately hot 29°C (84.2°F). Weather in July »

August, the last month of the summer, in Jeju, is also a moderately hot month, with average temperature varying between 24.3°C (75.7°F) and 29.8°C (85.6°F). With an average high-temperature of 29.8°C (85.6°F) and an average low-temperature of 24.3°C (75.7°F), August is the warmest month. Weather in August »

September, the first month of the autumn, in Jeju, is still a warm month, with average temperature ranging between min 20.4°C (68.7°F) and max 25.8°C (78.4°F). In September, the average high-temperature marginally drops, from a warm 29.8°C (85.6°F) in August, to a still moderately hot 25.8°C (78.4°F). Weather in September »

October, like September, is another pleasant autumn month in Jeju, South Korea, with average temperature ranging between min 15.1°C (59.2°F) and max 21.3°C (70.3°F). In October, the average high-temperature slightly decreases, from a warm 25.8°C (78.4°F) in September, to an agreeable 21.3°C (70.3°F). Weather in October »

The last month of the autumn, November, is also an enjoyable month in Jeju, South Korea, with temperature in the range of an average low of 9.8°C (49.6°F) and an average high of 16°C (60.8°F). In November, the average high-temperature drops, from a pleasant 21.3°C (70.3°F) in October, to a comfortable 16°C (60.8°F). Weather in November »

The first month of the winter, December, is still a cool month in Jeju, South Korea, with temperature in the range of an average high of 11°C (51.8°F) and an average low of 5.3°C (41.5°F). In Jeju, the average high-temperature in December drops, from a comfortable 16°C (60.8°F) in November, to a fresh 11°C (51.8°F). Weather in December »

What is the coldest month in Jeju?

The coldest month is January, with an average high-temperature of 8.3°C (46.9°F) and an average low-temperature of 3.2°C (37.8°F).

How many days does it rain in Jeju?

Throughout the year, there are 130.2 rainfall days, and 1497.7mm (59") of precipitation is accumulated.

What is the month with the least sunshine in Jeju?

With an average of 2.3h of sunshine, January has the least sunshine of the year.

What is the month with the lowest UV index in Jeju?

Months with the lowest UV index in Jeju are January and December, with an average maximum UV index of 3.

What are the least humid months in Jeju?

February and March, with an average relative humidity of 64.9%, are the least humid months.

What is the month with the coldest sea water in Jeju?

March is the month with the coldest seawater in Jeju, South Korea, with an average sea temperature of 13.3°C (55.9°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What month has the most sunshine in Jeju?

With an average of 6.8h of sunshine, May has the most sunshine of the year in Jeju, South Korea.

When are the longest days in Jeju?

The month with the longest days in Jeju, South Korea, is June, with an average of 14.4h of daylight.

What is the most humid month in Jeju?

July is the most humid month in Jeju, South Korea, with an average relative humidity of 78.3%.

What is the month with the highest UV index in Jeju?

With an average maximum UV index of 11, July is the month with the highest UV index in Jeju.

What is the warmest month in Jeju?

The warmest month in Jeju is August, with an average high-temperature of 29.8°C (85.6°F) and an average low-temperature of 24.3°C (75.7°F).

What is the rainiest month in Jeju?

The month with the most rainfall in Jeju, South Korea, is August when the rain falls for 13.5 days and typically aggregates up to 262.5mm (10.3") of precipitation.

What month is the sea warmest in Jeju?

With an average sea temperature of 26.2°C (79.2°F), August is the month with the warmest seawater in Jeju, South Korea. For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the driest month in Jeju?

The month with the least rainfall is December when the rain falls for 10.8 days and typically collects 47.7mm (1.9") of precipitation.

What is the month with the shortest days in Jeju?

December has the shortest days of the year in Jeju, with an average of 10h of daylight.
Average temperature - Jeju, South Korea
Average humidity - Jeju, South Korea

The month with the highest relative humidity is July (78.3%).
Months with the lowest relative humidity are February and March (64.9%).

Average rainfall - Jeju, South Korea

The wettest month (with the highest rainfall) is August (262.5mm).
The driest month (with the lowest rainfall) is December (47.7mm).

Average rainfall days - Jeju, South Korea

The month with the highest number of rainy days is August (13.5 days).
The month with the lowest number of rainy days is October (7 days).

Average sea temperature - Jeju, South Korea

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest month (with the lowest average sea temperature) is March (13.3°C).

Average daylight / Average sunshine - Jeju, South Korea