April weather forecast
Jeju, South Korea

April in Jeju brings a striking transformation as the island brightens up with temperatures reaching a pleasant high of 17.5°C (63.5°F). Spreading warmth across the island, April showcases a spring at its peak with all things beautiful proliferating around. The month, known for an impressive display of flora and fauna, invite nature lovers to relish in breathtaking landscapes rendered by cherry blossoms, camellias, and yellow rapeseed flowers. While showers become more frequent, they typically offer a scenic spectacle of rainbows against the azure skies. April's balmy weather coupled with longer days make it an ideal month for sightseeing and exploring the island's attractions.

Temperature

The embrace of April brings a minor uplift in the average high-temperature, shifting from a fresh 12.8°C (55°F) in March to a comfortable 17.5°C (63.5°F). Jeju throughout April, experiences an average nighttime temperature of 10.2°C (50.4°F).

Humidity

In Jeju, South Korea, the average relative humidity in April is 66.5%.

Rainfall

In Jeju, during April, the rain falls for 10 days and regularly aggregates up to 90mm (3.54") of precipitation. Throughout the year, there are 130.2 rainfall days, and 1498mm (58.98") of precipitation is accumulated.

Sea temperature

In April, the average sea temperature in Jeju is 14.7°C (58.5°F).
Note: Unprotected swimming in 14.7°C (58.5°F) is dangerous due to potential cold shock. Especially when temperatures go below 10°C (50°F), leading to hyperventilation.

Daylight

In April, the average length of the day is 13h and 1min.
On the first day of the month, sunrise is at 06:21 and sunset at 18:54. On the last day of April, sunrise is at 05:46 and sunset at 19:15 KST.

Sunshine

In Jeju, South Korea, the average sunshine in April is 6.5h.

UV index

In Jeju, South Korea, the average daily maximum UV index in April is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A daily high UV index of 8 in April leads to these guidelines:
Always prioritize safety measures. Rapid harm can befall unprotected skin and eyes. 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 hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.