Weather in Jeju in August 2025
- August is usually the hottest month of the year in Jeju;
Average weather
Average temperature in Jeju in August
Going from a maximum of +31°C during the day to a minimum of +23°C during the night, the temperature in August averages around +29°C.
The average maximum temperature goes down 62% by the end of the month, compared with the beginning of the month, from +31°C to +26°C.
Is Jeju warm or cold in August?
Jeju is typically warm in August.
Maximum temperatures go up compared to the previous month from +28°C to +29°C. The minimum temperature also goes up from +23°C to +25°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is the hottest month in Jeju, here is the comparison with other months:
Climate in Jeju in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +28°C | +29°C | +25°C | ||||
| Min. temperature | ||||||
| +18°C | +18°C | +14°C | ||||
| Max. temperature | ||||||
| +35°C | +36°C | +32°C | ||||
| Rainfall | ||||||
| 186 mm | 159 mm | 166 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 84% | 80% | 77% | ||||
| Air pressure | ||||||
| 1006 HPa | 1007 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 3 | 3 | 4 | ||||
| Cloudy days | ||||||
| 10 | 7 | 8 | ||||
| Rainy days | ||||||
| 18 | 20 | 18 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. It’s getting warmer as August arrives. The average maximum temperature goes up from +28°C to +29°C during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 186 mm to 159 mm. It feels drier, as humidity decreases from 84% to 80%. The average wind speed doesn’t change much during August, staying around 3 m/s. The amount of sunny days stay about the same, averaging 3 sunny days during the month.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Jeju is gradually decreasing during August, going from 7 m/s to 2 m/s over the course of the month.
Rain
How was the weather last August in Jeju?
Climate Change over Years
The climate in Jeju in August has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+17°C) and the highest in 2024 (+19°C). The driest year was 2005 with only 752 mm of rainfall, and the wettest year was 1985 with 1808 mm.
FAQ
Is August a good time to visit Jeju?
Can you sunbathe in Jeju in August?
Is Jeju rainy in August?
Is it sunny in Jeju in August?
Other cities in South Korea
Monthly weather in Jeju
Source of the data
For this page, we’ve looked at the typical weather in Jeju, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
