With Mt. Halla rising at its center, Jeju sees weather that splits between its north and south sides on the same day, and winds that feel unusually strong thanks to open sea on every side. Here's a breakdown of Jeju's weather, historical records, and seasonal tips.
Jeju has a maritime climate that keeps winters relatively milder than the mainland, but Mt. Halla rising at the island's center creates sharp differences in temperature and rainfall between the highlands and the coastal lowlands. With almost nothing to block wind coming from any direction, Jeju is known as an island of wind, with frequent strong gusts.
Mt. Halla blocks the flow of clouds and wind, so the north side (Jeju City) and south side (Seogwipo) often see different weather on the same day. Jeju City can be cloudy and rainy while Seogwipo stays clear.
Open to the sea on all sides with almost no terrain to block it, and lying in a typical typhoon path, Jeju sees strong winds more often. Even on seemingly clear, sunny days, coastal areas can feel wind strong enough to flip an umbrella or make walking difficult.
Its maritime climate keeps winters milder than the mainland, but high humidity and frequent overcast days can make it feel colder than the number suggests. The highlands of Mt. Halla can see accumulating snow, unlike the lowlands.
Spring warms up earlier here than elsewhere, though strong winds remain common. Summer, in the path of the monsoon and typhoons, calls for preparing for humid, heavy wind and rain, and even autumn can see a late typhoon's effects. Winter is milder than the mainland but brings frequent strong wind and humid, overcast skies. For general season-by-season tips, see the seasonal outdoor guide.
Based on official KMA observations at the Seogwipo Weather Station.
| Record | Value | Date |
|---|---|---|
| Record high | 35.9°C | 1966-08-03 |
On days under a strong-wind advisory, avoid walking along the coast or on oreum trails, and a windbreaker is safer than an umbrella. If you're planning to climb Mt. Halla, don't judge conditions by the weather at the base alone — check the highland forecast separately. For general threshold-by-threshold guidance on UV, feels-like temperature, and fine dust, see what to do.
Because weather in Jeju varies a lot not just between north and south but between highland and coastal areas, search for and add the areas you plan to visit — like "Jeju City" or "Seogwipo" — in sanCheck before your trip to compare weather and outdoor-activity scores ahead of time.