If you are planning an autumn trip to Jeju Island in September or October, scuba diving should be at the top of your list. As autumn begins on land in September, Jeju’s underwater world is just entering its vibrant summer. Most people associate diving with hot summer months, but experienced divers quietly wait for September. The sea runs a full season behind the land. While a cool breeze blows above, water temperatures reach their annual peak, marking the official start of the prime diving season.
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As the scorching heat on land subsides into a comfortable breeze, the water reaches its most soothing, comfortable temperature. September and October mark the period when the warm Kuroshio Current flows strongest past southern Jeju. Water temperatures reach up to 28°C, offering a tropical diving experience paired with crisp, pleasant autumn weather. Reduced particles in the water clear visibility up dramatically to 15–20 meters.
During this time, the waters surrounding Seogwipo’s famous islands—Munseom, Beomseom, and Seopseom—transform into colorful marine gardens. Rare soft coral species (Dendronephthya) bloom in full pink splendor. Migratory tropical fish drifting along the warm current mix with resident local species, creating breathtaking schooling movements along dramatic underwater cliffs.
After completing two morning dives exploring the vibrant ocean, head ashore for an afternoon of local autumn cuisine and sightseeing. During your surface interval on the boat, sipping a hot cup of coffee while gazing at the islands offers an unforgettable memory. Swimming through warm ocean waters by morning and strolling through silver grass fields under cool autumn breezes by afternoon—Jeju's hidden ocean summer is waiting for you.
