Weather in Чеджу by month: what to expect

Чеджу enjoys a temperate maritime climate, making it a year-round destination with distinct seasonal shifts. Winters here are mild compared to mainland Korea, with temperatures rarely dropping below 4 °C even in the coldest months. January and February bring cool but comfortable weather, ideal for exploring the island’s volcanic landscapes without the summer crowds.

From March to May, Чеджу awakens with spring blooms and rising temperatures, reaching a pleasant +15...+18 °C by April. Summers arrive in June, bringing warmth and humidity, with July and August often exceeding +28 °C. This is also the wettest period, especially in September, when typhoon season can bring heavy rains. Autumn, from October to November, offers a gentle cooldown, with crisp air and fewer tourists.

Winter in Чеджу is far from harsh, with daytime highs around +9 °C in January and +10 °C in February. Nights can dip to +4 °C, but the island’s coastal location moderates extreme cold. By March, temperatures climb to +11 °C, signaling the start of a gradual warm-up that peaks in August at +28.7 °C.

June marks the beginning of summer, with averages near +22.8 °C, while July and August see the mercury rise to +27.5 °C and +28.7 °C, respectively. Evenings remain warm, rarely falling below +24 °C. The heat lingers into early September, but by October, Чеджу cools to a comfortable +19.3 °C, making it one of the most pleasant times to visit.

By November, temperatures drop to +14.1 °C, and December brings a return to winter’s mild chill, with highs around +10.6 °C. The island’s volcanic terrain and ocean currents help maintain these moderate swings, avoiding the extremes found in other parts of Korea.

Чеджу’s rainfall is unevenly distributed, with the driest months in winter. January and February see around 74–78 mm of precipitation, while March and April bring slightly more, up to 100 mm. The real shift comes in June, when monsoon rains begin, peaking in July with 238 mm and continuing into September with a high of 374 mm.

The heaviest rains in September often coincide with typhoon season, which can disrupt travel plans. October offers a reprieve, with precipitation dropping to 87 mm, while November and December remain relatively dry, with totals under 120 mm. For those avoiding rain, January, February, and October are the safest bets.

Despite the summer downpours, Чеджу’s lush landscapes thrive on this seasonal pattern. The island’s waterfalls and gardens are at their most vibrant in July and August, while the cooler months offer clearer skies for hiking and sightseeing.

For a winter trip to Чеджу, pack layers to handle the mild but variable temperatures. A light jacket or sweater will suffice for daytime, while evenings may require something warmer, especially in January and February. Waterproof footwear is useful for occasional rain, though heavy snow is rare.

Spring and autumn in Чеджу call for versatile clothing. From March to May, light layers work well, with a mix of short- and long-sleeve options for fluctuating temperatures. October and November are similar, though evenings can turn chilly, so a light scarf or jacket is advisable. Comfortable walking shoes are a must for exploring the island’s trails.

Summer in Чеджу demands lightweight, breathable fabrics to cope with heat and humidity. Pack quick-dry clothing, a wide-brimmed hat, and sunscreen for protection against the strong sun. A compact umbrella or rain jacket is essential for sudden downpours, particularly in July and September. Don’t forget swimwear—August’s water temperatures reach +30 °C, perfect for beach days.