August 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 August

August maintains the peak of summer in Seoul, with sultry weather and intense rain showers. It is a typical sight to see locals sipping on cold buckwheat noodles to keep cool. Outdoor enthusiasts will relish in the magnificent sunsets along the Han River despite the high humidity. It is the city's hottest month, with the highest mean temperature reaching up to 29.6°C (85.3°F). As September approaches, signs of autumn begin to peek through the summer haze.

Temperature

Seoul experiences its highest temperatures in August, with an average peak of 29.6°C (85.3°F) and a low of 22.4°C (72.3°F).

Heat index

August's mean heat index is computed to be a fiery hot 35°C (95°F). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The average relative humidity in August is 75.6%.

Rainfall

In Seoul, in August, it is raining for 14.6 days, with typically 364mm (14.33") of accumulated precipitation. Throughout the year, there are 108.8 rainfall days, and 1451mm (57.13") of precipitation is accumulated.

Daylight

In Seoul, the average length of the day in August is 13h and 35min.
On the first day of the month, sunrise is at 05:36 and sunset at 19:40. On the last day of August, sunrise is at 06:01 and sunset at 19:03 KST.

Sunshine

In Seoul, the average sunshine in August is 4.9h.

UV index

The average daily maximum UV index in August is 9. 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: In August, the maximum UV index of 9 suggests these recommendations:
Always be mindful of protection. The risk of damage to skin and eyes is significant if neglected. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Experience reduced UV exposure by about half when donning a wide-brim hat. Even if it's cloudy, generously apply and frequently reapply a sunscreen with no less than a 30 sun protection factor after each swim or outdoor exercise.

Frequently asked questions

What month is the hottest?

The month of August sees the average highest temperatures, reaching 29.6°C (85.3°F) at the peak and 22.4°C (72.3°F) at the low.

Is it hot during August?

The average high-temperature and low-temperature in Seoul during August are 29.6°C (85.3°F) and 22.4°C (72.3°F) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in August is computed to be 35°C (95°F).

What is the average humidity in August?

The average relative humidity in August is 75.6%.

How many days does it rain in August in Seoul?

In Seoul, in August, during 14.6 rainfall days, 364mm (14.33") of precipitation is typically accumulated.

How many hours of daylight does Seoul have in August?

In August, the average day length is 13h and 35min.

When is the sunrise / sunset in August?

In August, on the first day of the month, sunrise is at 05:36 and sunset at 19:40. On the last day of the month, sunrise is at 06:01 and sunset at 19:03 KST.

How many hours of sunshine does Seoul have in August?

In Seoul, the average sunshine duration in August is 4.9h.

What is the UV index reading in August?

The average daily maximum UV index in August is 9. A UV Index reading of 8 to 10 represents 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 August
Seoul, South Korea

Average temperature in August - Seoul, South Korea
  • Average high temperature in August: 29.6°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 August: 22.4°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 August
Seoul, South Korea

Average humidity in August - Seoul, South Korea
  • Average humidity in August: 75.6%

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 August
Seoul, South Korea

Average rainfall in August - Seoul, South Korea
  • Average rainfall in August: 364.2mm

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 August
Seoul, South Korea

Average rainfall days in August - Seoul, South Korea
  • Average rainfall days in August: 14.6 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 August /
Average sunshine in August
Seoul, South Korea

Average daylight in August / Average sunshine in August - Seoul, South Korea
  • Average daylight in August: 13h and 4min

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 August: 4h 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 August
Seoul, South Korea

Average UV index in August - Seoul, South Korea
  • Average UV index in August: 9

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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