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

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
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).

Temperature

In May, the average high-temperature marginally rises, from a comfortable 17.5°C (63.5°F) in April, to an agreeable 21.6°C (70.9°F). In Jeju, the average low-temperature is 14.4°C (57.9°F).

Humidity

In May, the average relative humidity in Jeju is 70.4%.

Rainfall

In Jeju, in May, it is raining for 10.4 days, with typically 96.4mm (3.8") of accumulated precipitation. In Jeju, during the entire year, the rain falls for 130.2 days and collects up to 1497.7mm (59") of precipitation.

Sea temperature

In Jeju, South Korea, the average water temperature is 16.8°C (62.2°F).
Note: For swimming, a surface water temperature of 16.8°C (62.2°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

In Jeju, the average length of the day is 13.9h.

Sunshine

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

UV index

The average daily maximum UV index in Jeju is 9. A UV Index of 8 to 10 symbolizes a very high health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 9 transform into the following instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in May in Jeju?

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

What is the average humidity in May in Jeju?

In May, the average relative humidity in Jeju is 70.4%.

How many days does it rain in May in Jeju?

In Jeju, in May, during 10.4 rainfall days, 96.4mm (3.8") of precipitation is typically accumulated.

What is the sea temperature in May in Jeju?

In Jeju, the average seawater temperature in May is 16.8°C (62.2°F). Swimming in 16.8°C (62.2°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in May in Jeju?

In Jeju, the average length of the day in May is 13.9h.

What month has the most sunshine in Jeju?

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

How many hours of sunshine does Jeju have in May?

In May, the average sunshine in Jeju, South Korea, is 6.8h.

How high is the UV index in May in Jeju?

The average daily maximum UV index in May in Jeju is 9. A UV Index value of 8 to 10 symbolizes a very high health risk from unsafe exposure to the Sun's UV rays.
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).