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 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). The average low-temperature, in Jeju, South Korea, is 14.4°C (57.9°F).

Humidity

In Jeju, the average relative humidity is 70.4%.

Rainfall

In Jeju, during May, the rain falls for 10.4 days and regularly aggregates up to 96.4mm (3.8") of precipitation. In Jeju, South Korea, during the entire year, the rain falls for 130.2 days and collects up to 1497.7mm (59") of precipitation.

Sea temperature

In May, the average sea temperature in Jeju 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).

Daylight

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

Sunshine

The month with the most sunshine in Jeju, South Korea, is May, with an average of 6.8h of sunshine.

UV index

In May, the average daily maximum UV index in Jeju is 9. A UV Index reading of 8 to 10 represents a very high threat to health from the exposure to the Sun's UV rays for average individuals.
The daily maximum UV index of 9 in May interpret into the following advice:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in May in Jeju?

In Jeju, South Korea, in May, the average high-temperature is 21.6°C (70.9°F), and the average low-temperature is 14.4°C (57.9°F).

What is the average humidity in May in Jeju?

In Jeju, South Korea, the average relative humidity in May 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.

How cold is the water in May in Jeju?

In Jeju, 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).

How many hours of daylight does Jeju have in May?

The average length of the day in May in Jeju, South Korea, is 13.9h.

What month has the most sunshine in Jeju?

With an average of 6.8h of sunshine, May has the most sunshine of the year.

How many hours of sunshine does Jeju have in May?

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

How high is the UV index in May in Jeju?

In Jeju, South Korea, the average daily maximum UV index in May is 9. A UV Index of 8 to 10 symbolizes a very high hazard to health from the 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).