May 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 May in Jeju?

The average high-temperature, in May, in Jeju, is 21.6°C (70.9°F), while the average low-temperature is 14.4°C (57.9°F).

How much does it rain in Jeju in May?

In Jeju, in May, it is raining for 10.4 days, with typically 96.4mm (3.8") of accumulated precipitation.

What is the sea temperature in May in Jeju?

In Jeju, South Korea, in May, the average water temperature is 16.8°C (62.2°F). For most, swimming in 16.8°C (62.2°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Average temperature in May - Jeju, South Korea
  • Average high temperature in May: 21.6°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 May: 14.4°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 May - Jeju, South Korea
  • Average humidity in May: 70.4%

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 May - Jeju, South Korea
  • Average rainfall in May: 96.4mm

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 May - Jeju, South Korea
  • Average rainfall days in May: 10.4 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 May - Jeju, South Korea
  • Average sea temperature in May: 16.8°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 May / Average sunshine in May - Jeju, South Korea
  • Average daylight in May: 13.9h

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 May: 6.8h

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 May - Jeju, South Korea
  • Average UV index in May: 9

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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