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. 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

Jeju observes a slight uplift in the average high-temperature with the onset of April, adjusting from March's fresh 12.8°C to a comfortable 17.5°C. Jeju records a steady low-temperature average of 10.2°C during April.

Humidity

In April, the average relative humidity is 66.5%.

Rainfall

In Jeju, in April, during 10 rainfall days, 90mm of precipitation is typically accumulated. In Jeju, during the entire year, the rain falls for 130.2 days and collects up to 1498mm of precipitation.

Sea temperature

In Jeju, South Korea, in April, the average water temperature is 14.7°C.
Note: Swimming at temperatures less than 10°C in 14.7°C is feasible with the right swimsuit; if not, expect cold shock and breathlessness. A quick swim at 13°C without adequate warmth can be discomforting.

Daylight

In April, the average length of the day is 13h and 1min.
On the first day of the month, sunrise is at 06:22 and sunset at 18:53. On the last day of April, in Jeju, South Korea, sunrise is at 05:46 and sunset at 19:15 KST.

Sunshine

The average sunshine in April in Jeju is 6.5h.

UV index

In Jeju, the average daily maximum UV index in April is 8. A UV Index reading of 8 to 10 represents a very high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 8 during April leads to these instructions:
Ensure you're always protected. Unprotected skin can get damaged in moments. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.