Monthly climate guide
Jeju weather in August
Expect hot weather in Jeju in August: afternoons reach about 28°C (82°F), while nights drop to around 26°C (79°F). Around 243 mm of rain falls over the month (very wet), and skies are often cloudy. Daytime highs are 2°C warmer than July and 3°C warmer than September.
What stands out in August
- Jeju is usually about 2°C cooler than Gwangju, 190 km away, in August.
- It's wetter than a typical month in Jeju — roughly 92% more rain than average.
- Days and nights are close, only about 2°C apart.
- It's humid — around 84% — so the heat feels heavier.
August is typically Jeju's warmest month.It's usually the wettest month of the year.
Avg high
28°C
82°F
Avg low
26°C
79°F
Rainfall
243 mm
very wet
Humidity
84%
relative
Sky
66%
cloud · often cloudy
Jeju weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 8°C / 47°F | 6°C / 43°F | 47 mm | 77% | 77% |
| February | 9°C / 48°F | 6°C / 43°F | 61 mm | 75% | 76% |
| March | 11°C / 52°F | 8°C / 47°F | 91 mm | 74% | 67% |
| April | 15°C / 58°F | 12°C / 53°F | 142 mm | 79% | 68% |
| May | 18°C / 64°F | 15°C / 60°F | 122 mm | 84% | 72% |
| June | 22°C / 71°F | 20°C / 67°F | 179 mm | 89% | 82% |
| July | 26°C / 78°F | 24°C / 75°F | 195 mm | 90% | 74% |
| August | 28°C / 82°F | 26°C / 79°F | 243 mm | 84% | 66% |
| September | 24°C / 76°F | 22°C / 72°F | 180 mm | 80% | 68% |
| October | 20°C / 69°F | 18°C / 64°F | 106 mm | 74% | 59% |
| November | 16°C / 60°F | 13°C / 56°F | 88 mm | 74% | 68% |
| December | 11°C / 51°F | 8°C / 46°F | 63 mm | 76% | 77% |
What to pack for August
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is August a good time to visit Jeju?
Compare the months in the chart above to find your ideal window.
Best time to visit Jeju →Other South Korea cities in August
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Jeju weather in August. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/south-korea/jeju/august
<a href="https://weathercompare.eu/weather/south-korea/jeju/august">Jeju weather in August</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/south-korea/jeju" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Jeju weather in August"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/south-korea/jeju/august">Jeju weather in August</a> – WeatherCompare</p>
Jeju in August: quick answers
Is August a good time to visit Jeju?
August is one of the wetter months in Jeju, with about 243 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Jeju in August?
Average highs are about 28°C (82°F) and average lows about 26°C (79°F), based on 10 years of daily data.
Does it rain a lot in Jeju in August?
Jeju typically gets around 243 mm of rain in August — very wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Jeju (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.