Climate Chart of Jeju City, South Korea

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

Monthly mean temperature is lowest in January, at 6.1 °C, and highest in August, at 27.4 °C. These are averages for each month, not daytime maximum temperatures, so they do not show how warm or cool any particular day may feel. The unweighted mean of the monthly means is 16.3 °C; it summarizes the supplied monthly averages rather than a day-weighted annual figure.

Rain

Mean daily rainfall is lowest in January, at 2.00 mm/day, and highest in September, at 9.37 mm/day. These are daily mean amounts for the named months, not monthly rainfall totals; they also do not indicate how often rain falls or whether a particular day will be wet. The unweighted mean of the monthly daily means is 4.59 mm/day, a broad summary rather than a day-weighted annual average.

Snow

The highest monthly mean daily snowfall is recorded in January, at 4.97 mm/day; the unweighted mean of the monthly daily snowfall means is 1.12 mm/day. These are averages of daily amounts, not monthly totals. They do not show how many days have snowfall, how deep snow becomes, whether snow cover persists, or whether conditions suit skiing.

Sunshine

Mean daily sunshine duration reaches its highest monthly value in August, at 9.74 hours/day, and its lowest in January, at 5.25 hours/day. The unweighted mean across the monthly sunshine means is 7.65 hours/day. These figures describe average sunshine duration, not daylight length, and cannot establish the conditions on a particular day.

Best Travel Time Guide for Jeju City, South Korea: Ideal Seasons and Weather Insights

If lower average rainfall is your priority, January is the conditional option in the supplied figures, with mean daily rainfall of 2.00 mm/day; this does not guarantee dry days or quantify rain frequency. For rain preparation, note that the highest monthly mean daily rainfall is in September, at 9.37 mm/day, and consider packing adaptable rain protection rather than treating the average as a forecast. Visitors prioritising cooler monthly averages may prefer January, when the monthly mean temperature is 6.1 °C; this is not a daytime high or a promise about daily conditions. For outdoor sightseeing planned around average sunshine duration, August records 9.74 hours/day per day, while January records 5.25 hours/day. Sunshine duration is not day length, and these separate criteria do not establish one universally best time to visit.

For winter travel planning, January has the highest monthly mean daily snowfall, at 4.97 mm/day. This average cannot tell you how many snowy days to expect, whether snow will cover the ground, or what conditions will be like on a particular visit; check current forecasts closer to travel.

Climate Data Overview for Jeju City, South Korea

Explore the comprehensive climate data for Jeju City, South Korea. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in Jeju City
• Explore the climate in South Korea