September 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 temperature in September in Jeju?

The average high-temperature, in September, in Jeju, South Korea, is 25.8°C (78.4°F), while the average low-temperature is 20.4°C (68.7°F).

How much does it rain in Jeju in September?

In Jeju, South Korea, during September, the rain falls for 10.8 days and regularly aggregates up to 221.6mm (8.7") of precipitation.

What is the sea temperature in September in Jeju?

In Jeju, in September, the average water temperature is 24.7°C (76.5°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24.7°C (76.5°F).
Average temperature in September - Jeju, South Korea
  • Average high temperature in September: 25.8°C

The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in September: 20.4°C

The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is January (3.2°C).

Average humidity in September - Jeju, South Korea
  • Average humidity in September: 73.7%

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 in September - Jeju, South Korea
  • Average rainfall in September: 221.6mm

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 in September - Jeju, South Korea
  • Average rainfall days in September: 10.8 days

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 in September - Jeju, South Korea
  • Average sea temperature in September: 24.7°C

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 in September / Average sunshine in September - Jeju, South Korea
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 5.4h

The month with most sunshine is May (Average sunshine: 6.8h).
The month with least sunshine is January (Average sunshine: 2.3h).

Average UV index in September - Jeju, South Korea
  • Average UV index in September: 8

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).

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