May weather forecast
Jeju, South Korea

May in Jeju witnesses a marked advancement of spring, turning into early summer with highs around 21.6°C (70.9°F). The month signifies a warmth that permeates not just the weather but also the island's vibrant life. Sights of emerald-green tea fields and lush vegetation dominate, symbolizing the island in full bloom. May showers are scattered but add an overall pleasing appeal making the landscapes more photogenic. With daylight stretching longer and consistent sunshine, May emerges as a preferred month for picnics, sunbathing on the beach, or indulging in water sports.

Temperature

The onset of May marks a slight increase in the average high-temperature, moving from a comfortable 17.5°C (63.5°F) in April to an agreeable 21.6°C (70.9°F). May's nights observe an average temperature of 14.4°C (57.9°F).

Humidity

The average relative humidity in May is 70.4%.

Rainfall

In Jeju, in May, it is raining for 10.4 days, with typically 96mm (3.78") of accumulated precipitation. Throughout the year, there are 130.2 rainfall days, and 1498mm (58.98") of precipitation is accumulated.

Sea temperature

In Jeju, South Korea, in May, the average water temperature is 16.8°C (62.2°F).
Note: For the majority of people, swimming in water at 16.8°C (62.2°F) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

In May, the average length of the day is 13h and 53min.
On the first day of May in Jeju, sunrise is at 05:45 and sunset at 19:16. On the last day of the month, sunrise is at 05:25 and sunset at 19:38 KST.

Sunshine

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

UV index

The average daily maximum UV index in May is 9. A UV Index estimate of 8 to 10 represents a very high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 9 in May translates into the following recommendations:
Ensure you act responsibly. Without precautions, skin and eyes can suffer. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.