The hottest month in Jeju is typically June, with daytime highs averaging around 26.8°C (80°F), based on 10 years of historical weather data. Overnight lows during this period average near 16.4°C (62°F).

What is the coldest month in Jeju?

The coldest month in Jeju is typically January, with overnight lows averaging around 13.1°C (56°F) and daytime highs near 23.6°C (74°F), based on 10 years of historical weather data.

Does Jeju have a rainy season?

Jeju doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. August is the wettest month on average (about 101 mm), while December is the driest (about 10 mm).

What's the best time of year to visit Jeju?

The best time to visit Jeju is typically December to January, when daytime highs average a comfortable 23.5°C (74°F). Rainfall during this window averages around 13 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Atmospheric Details

Wind

6 km/h

SW · Light Breeze · Max 15 km/h

Humidity

81 %

High · feels muggy

UV Index

Very High

Visibility

10 km

Excellent

Pressure

824 hPa

Low · change likely

Dew Point

17°C

Somewhat humid

Today vs Normal

24°C-2° below normal

The long-term average high for today is 26°C.

Air Quality

Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Health & Activity Advice

⚠ Limit Outdoor Time

UV index is 9 today — very high. Limit sun exposure around midday, apply SPF 30+ every two hours, and seek shade when possible.

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.