May weather forecast
Seoul, South Korea

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The Dongdaemun Gate in Seoul city, South Korea
The Dongdaemun Gate in Seoul city, South Korea

Weather in May

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

May's arrival sees a rise in the average high-temperature, jumping from April's comfortable 17.8°C (64°F) to a warm 23°C (73.4°F). Seoul's nights in May cool down to an average low-temperature of 13.2°C (55.8°F).

Humidity

In May, the average relative humidity is 62.7%.

Rainfall

In Seoul, in May, during 9 rainfall days, 106mm (4.17") of precipitation is typically accumulated. In Seoul, during the entire year, the rain falls for 108.8 days and collects up to 1451mm (57.13") of precipitation.

Daylight

In May, the average length of the day 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

In Seoul, the average daily maximum UV index in May is 8. A UV Index of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In May, a regular UV index of 8 translates into these guidelines:
Being careless can result in skin and eye damage. Always take the necessary safety measures. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.

Frequently asked questions

What is the average May temperature?

During May, Seoul experiences an average high-temperature of 23°C (73.4°F) and a low-temperature of 13.2°C (55.8°F).

What is the average humidity in May in Seoul?

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

How many days does it rain in May?

In Seoul, during May, the rain falls for 9 days and regularly aggregates up to 106mm (4.17") of precipitation.

What is the average length of the day in May?

The average day length in May is 14h and 11min.

When is the sunrise / sunset in May?

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.

What month has the most sunshine?

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

How long on average sun shines in May?

In Seoul, the average sunshine duration in May is 6.9h.

What is the UV index intensity in May in Seoul?

In Seoul, the average daily maximum UV index in May is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Seoul, South Korea

Average temperature in May - Seoul, South Korea
  • 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).

  • 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).

Average humidity in May
Seoul, South Korea

Average humidity in May - Seoul, South Korea
  • 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%).

Average rainfall in May
Seoul, South Korea

Average rainfall in May - Seoul, South Korea
  • Average rainfall in May: 105.9mm

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

Average rainfall days in May
Seoul, South Korea

Average rainfall days in May - Seoul, South Korea
  • 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 least rainy days is February (5.8 days).

Average daylight in May /
Average sunshine in May
Seoul, South Korea

Average daylight in May / Average sunshine in May - Seoul, South Korea
  • Average daylight in May: 14h and 1min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in May: 6h and 5min

The month with the most sunshine is May (Average sunshine: 6h and 54min).
The month with the least sunshine is July (Average sunshine: 3h and 54min).

Average UV index in May
Seoul, South Korea

Average UV index in May - Seoul, South Korea
  • Average UV index in May: 8

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

Seoul, South Korea

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