Climate in Jeju, South Korea

Jeju, South Korea has a humid subtropical climate. The annual average temperature is about 20.5°C and the city receives roughly 1300 mm of precipitation across 145 rainy days a year, with around 1203 hours of sunshine. The warmest month is Jul (highs near 30.8°C) and the coldest is Jan (lows near 10.2°C). These are deterministic, latitude- and region-based planning estimates — not a forecast or measured station data; check current conditions with an official meteorological service before travel.

Data year 2025; last updated 2026-05-16.

Jeju is classified as Humid Subtropical. This reflects its annual temperature range and the seasonal pattern of its rainfall.

Jeju receives about 1300 mm of precipitation a year over roughly 145 rainy days. The wettest month is Jul and the driest is Jan.

Jeju sees an estimated 1203 hours of sunshine a year, concentrated in the warmer months around Jul.

By temperature and rainfall, the most comfortable months in Jeju are Nov, Feb, Oct. Conditions vary year to year — verify with a current forecast before booking.

Jeju has a climate comfort score of 78/100, a very comfortable year-round climate by this measure. The score weights mild temperatures most, then rainfall balance, sunshine, low seasonality, and the absence of extreme winter cold or summer heat.