August weather forecast
Jeju, South Korea

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A high sunrise Panorama of the Jeju Island in Jeju, South Korea
A high sunrise Panorama of the Jeju Island in Jeju, South Korea

Weather in August

August continues the narrative of a warm, wet summer in Jeju. With the mercury hitting a high of 29.8°C, the weather remains hot but slightly less severe than July. As sea temperatures rise, opportunities for snorkeling, diving, and swimming multiply, adding to Jeju's summer euphoria. While humidity levels stay high, they do bring along brief spells of respite in the form of generous showers. Despite summer being at its tail end, the island doesn't lose its charm, radiating beauty through its myriad natural wonders.

Temperature

In Jeju, August is the month with the highest recorded average temperatures, measuring a high of 29.8°C and a low of 24.3°C.

Heat index

For August, the heat index is computed to be a torrid 36°C. Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
In terms of the heat index, values are set with light wind and shade conditions in mind. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are largely significant for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

In Jeju, the average relative humidity in August is 76.5%.

Rainfall

The month with the most rainfall is August, when the rain falls for 13.5 days and typically aggregates up to 263mm of precipitation.

Sea temperature

With an average sea temperature of 26.2°C, August is the month with the warmest seawater.
Note: In any water activity, temperatures between 25°C and 29°C are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

In August, the average length of the day is 13h and 23min.
On the first day of August, sunrise is at 05:45 and sunset at 19:34. On the last day of the month, sunrise is at 06:06 and sunset at 19:01 KST.

Sunshine

In August, the average sunshine in Jeju is 6.3h.

UV index

In Jeju, the average daily maximum UV index in August is 10. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In August, a daily UV index of 10 turns into the following recommendations:
Stay protected; otherwise, skin and eyes can suffer rapid damage. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Even under cloud cover, use sunscreen with at least an SPF 30 generously and reapply frequently post every swim or outdoor exercise. Be on guard! The reflective nature of sand and water boosts UV exposure.
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FAQ

What is the warmest month in Jeju?

In Jeju, August registers the highest temperatures, averaging 29.8°C at the peak and 24.3°C at the lowest.

How hot is it in Jeju in August?

The high-temperature during August is 29.8°C and the low-temperature is 24.3°C. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is computed to be 36°C.

What is the average humidity in August in Jeju?

The average relative humidity in August in Jeju, South Korea, is 76.5%.

What is the rainiest month in Jeju?

August is the month with the most rainfall in Jeju, South Korea. Rain falls for 13.5 days and accumulates 263mm of precipitation.

How much does it rain in Jeju in August?

In Jeju, during August, the rain falls for 13.5 days and regularly aggregates up to 263mm of precipitation.

When is the sea warmest in Jeju?

The month with the warmest seawater in Jeju is August, with an average sea temperature of 26.2°C.

What is the water temperature in August in Jeju?

In Jeju, in August, the average water temperature is 26.2°C. Water temperature between 25°C and 29°C is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in August in Jeju?

The average day length in August is 13h and 23min.

When is the sunrise / sunset in August in Jeju?

In August, on the first day of the month, sunrise is at 05:45 and sunset at 19:34. On the last day of the month, in Jeju, sunrise is at 06:06 and sunset at 19:01 KST.

How long on average sun shines in August in Jeju?

The average sunshine duration in August in Jeju is 6.3h.

What is the UV index intensity in August in Jeju?

In August, the average daily maximum UV index in Jeju is 10. A UV Index estimate of 8 to 10 represents a very high health risk from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average UV index

Average temperature in August
Jeju, South Korea

Average temperature in August - Jeju, South Korea
  • Average high temperature in August: 29.8°C

The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in August: 24.3°C

The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is January (3.2°C).

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Average humidity in August
Jeju, South Korea

Average humidity in August - Jeju, South Korea
  • Average humidity in August: 76.5%

The month with the highest relative humidity is July (78.3%).
The months with the lowest relative humidity are February and March (64.9%).

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Average rainfall in August
Jeju, South Korea

Average rainfall in August - Jeju, South Korea
  • Average rainfall in August: 262.5mm

The wettest month (with the highest rainfall) is August (262.5mm).
The driest month (with the least rainfall) is December (47.7mm).

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Average rainfall days in August
Jeju, South Korea

Average rainfall days in August - Jeju, South Korea
  • Average rainfall days in August: 13.5 days

The month with the highest number of rainy days is August (13.5 days).
The month with the least rainy days is October (7 days).

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Average sea temperature in August
Jeju, South Korea

Average sea temperature in August - Jeju, South Korea
  • Average sea temperature in August: 26.2°C

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest month (with the lowest average sea temperature) is March (13.3°C).

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Average daylight in August /
Average sunshine in August
Jeju, South Korea

Average daylight in August / Average sunshine in August - Jeju, South Korea
  • Average daylight in August: 13h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in August: 6h and 2min

The month with the most sunshine is May (Average sunshine: 6h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average UV index in August
Jeju, South Korea

Average UV index in August - Jeju, South Korea
  • Average UV index in August: 10

The month with the highest UV index is July (UV index 11).
The months with the lowest UV index are January and December (UV index 3).

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Jeju, South Korea

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