Jeju City weather › September
September is the 3rd rainiest month of the year in Jeju City. On average it rains on 9 of 30 days, with highs of 27°C (80°F) and lows of 22°C (71°F).
Trip rating: Great (83/100) · Best months: May–June and October
Rainy day = 1 mm or more of rain. Of these, about 5 days get 10 mm or more. Average of the last 30 years.
T-shirts plus a light long-sleeve layer.
Rain is similar to August. October is drier by 3 days. Daytime highs fall to 22°C (72°F) in October.
Pick your arrival and departure dates. We look up the same dates over the last 30 years.
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Seollal and Chuseok are Korea's biggest holidays. Trains and highways are packed, many shops and restaurants close for a day or two, but palaces and big malls usually stay open. Book KTX tickets early.
| Time zone | Korea Standard Time (UTC+9), no daylight saving |
|---|---|
| Power | 220V, 60Hz, Type C/F (round two-pin) sockets |
| Money | Korean won (KRW). Cards are accepted almost everywhere |
| Entry | Visa and K-ETA rules change — check the official K-ETA site and your government's travel advice |
Sunrise 6:16, sunset 18:41 on September 15 (local time) — about 12 h 25 min of daylight.
Observed at Korea Meteorological Administration (KMA) station 184, 1996–2025 daily records. Sea temperature: ERA5 (Copernicus), daily mean just offshore. How we calculate