Seoul
South Korea
Long-term weather forecast
Long-term weather forecast
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May weather forecast and Climate
Seoul, South Korea

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The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
May is damp but equally sunny and cloudy in Seoul as the mercury column rises up with every passing day. The average temperatures are in the 13.3°C (55.9°F) to 22.8°C (73°F) range as the humidity increases to about 75%.
The rainfall is around 106.7mm (4.2") as the region prepares for the onset of the monsoon season. The surrounding hills wear a lush green look, and the weather is enjoyable. The 14-hour days see a daily 7 hours of temperate sunshine.
Expect rain and shine in May - carry umbrellas or wear rain jackets while exploring outdoors. Asian Dust sporadically affects plants and animals during spring.
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  • The average high temperature in May: 23°C

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (1.5°C).

  • The average low temperature in May: 13.2°C

The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

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  • The average humidity in May: 62.7%

The month with the highest relative humidity is July (78.3%).
The month with the lowest relative humidity is April (56.2%).

  • The average rainfall in May: 105.9mm

The wettest month (with the highest rainfall) is July (394.7mm).
The driest month (with the lowest rainfall) is January (20.8mm).

  • The average rainfall days in May: 9 days

The month with the highest number of rainy days is July (16.3 days).
The month with the lowest number of rainy days is February (5.8 days).

  • The average daylight in May: 14h

The month with the longest days is June (Average daylight: 15h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The average sunshine in May: 6.9h

The month with most sunshine is May (Average sunshine: 6.9h).
The month with least sunshine is July (Average sunshine: 3.9h).

  • The average UV index in May: 8

The month with the highest UV index is July (UV index 10).
Months with the lowest UV index are January and December (UV index 2).

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