Climate averages 1991–2020
Jeju City weather
in January.
A cool, moderately wet month: the coolest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Jeju City: daytime highs average 8.0°C and nights cool to about 4.7°C. By daytime temperature it is the coolest month of the year.
Expect about 73 mm of rain on roughly 12 days, which makes January a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 12 min on an average January day.
The nearest other city in this atlas is Seogwipo (29 km away). In January its highs average 8.1°C, about as warm as Jeju City, with 56 mm of rain.
Among the 79 cities listed in South Korea, Jeju City ranks 2nd of 79 for the warmest January highs and 79th of 79 for the driest January (rainfall, lowest first). The mean January high of those 79 cities is 3.6°C; Jeju City is 4.5°C warmer than that mean.
From January to February, average highs rise by 1.0°C to 9.1°C, and monthly rainfall falls from 73 mm to 65 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Jeju City climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 8.0°C4.7°C | 4.7°C | 73 | 11.7 | 10.210 h |
| February | 9.1°C5.0°C | 5.0°C | 65 | 9.4 | 11.011 h |
| March | 12.2°C7.5°C | 7.5°C | 94 | 10.3 | 12.012 h |
| April | 16.4°C11.4°C | 11.4°C | 102 | 8.9 | 13.013 h |
| May | 20.1°C15.5°C | 15.5°C | 109 | 8.8 | 13.914 h |
| June | 23.5°C19.7°C | 19.7°C | 189 | 11.5 | 14.314 h |
| July | 27.6°C24.3°C | 24.3°C | 184 | 12.1 | 14.114 h |
| August | 28.7°C25.7°C | 25.7°C | 168 | 13.7 | 13.413 h |
| September | 25.3°C22.3°C | 22.3°C | 165 | 11.1 | 12.412 h |
| October | 20.7°C17.4°C | 17.4°C | 79 | 6.7 | 11.411 h |
| November | 15.8°C11.9°C | 11.9°C | 70 | 8.8 | 10.510 h |
| December | 10.5°C6.8°C | 6.8°C | 68 | 11.0 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Seogwipo in JanuarySouth Korea · 29 kmHigh 8.1°C · Low 4.1°C · 56 mm rain
- Mokpo in JanuarySouth Korea · 145 kmHigh 5.0°C · Low 0.1°C · 34 mm rain
- Muan in JanuarySouth Korea · 165 kmHigh 5.1°C · Low -1.0°C · 25 mm rain
- Yeosu in JanuarySouth Korea · 174 kmHigh 5.8°C · Low -0.1°C · 34 mm rain
- Masan in JanuarySouth Korea · 182 kmHigh 4.9°C · Low -2.6°C · 27 mm rain
- Suncheon in JanuarySouth Korea · 183 kmHigh 5.7°C · Low -2.4°C · 29 mm rain
- Gwangju in JanuarySouth Korea · 186 kmHigh 4.6°C · Low -2.9°C · 28 mm rain
- Kwangyang in JanuarySouth Korea · 190 kmHigh 5.7°C · Low -2.2°C · 29 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Jeju City) is explained once on the Jeju City year overview and on the Sources, method and limits page.