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

What is the coldest month in Jeju?

With an average high-temperature of 8.3°C (46.9°F) and an average low-temperature of 3.2°C (37.8°F), January is the coldest month in Jeju, South Korea.

How many days does it rain in Jeju?

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

When is the sea coldest in Jeju?

Month with the coldest seawater in Jeju is March, with an average sea temperature of 13.3°C (55.9°F). Swimming in 13.3°C (55.9°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the warmest month in Jeju?

August is the warmest month, 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?

August is the month with the most rainfall. Rain falls for 13.5 days and accumulates 262.5mm (10.3") of precipitation.

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

Month with the warmest seawater in Jeju is August, with an average sea temperature of 26.2°C (79.2°F). 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.
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
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