May weather forecast
Seoul, South Korea

May is marked by Seoul's rapid transition into summer, with more daylight hours and increasingly warm temperatures. Gardens are in full bloom and street festivals become more frequent and vibrant. Visitors and locals can enjoy outdoor dining and afternoon strolls in parks. Notably, May sees 106mm (4.17") of rainfall, indicating the onset of the monsoon season. As June approaches, conditions become wetter and hotter, signifying the start of summer.

Temperature

The transition to May introduces an increase in the average high-temperature in Seoul, shifting from a refreshing 17.8°C (64°F) in April to a warm 23°C (73.4°F). Seoul throughout May, experiences an average nighttime temperature of 13.2°C (55.8°F).

Humidity

In Seoul, the average relative humidity in May is 62.7%.

Rainfall

In Seoul, in May, it is raining for 9 days, with typically 106mm (4.17") of accumulated precipitation. Throughout the year, in Seoul, there are 108.8 rainfall days, and 1451mm (57.13") of precipitation is accumulated.

Daylight

The average length of the day in May in Seoul is 14h and 11min.
On the first day of May, sunrise is at 05:36 and sunset at 19:21. On the last day of the month, sunrise is at 05:12 and sunset at 19:47 KST.

Sunshine

May has the most sunshine of the year, with an average of 6.9h of sunshine.

UV index

The average daily maximum UV index in May in Seoul is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index, 8 in May, converts into the following recommendations:
Precautions are essential; the risk of damage to unprotected skin and eyes is too high. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.