Jeju, South Korea · Records from 2006 to 2025. Not a forecast.
Mean high9°Hottest day 19.2° (2020)
Mean low4°Coldest night −4.2° (2016)
Rain days8 days2-12 by year
Rainfall59mmDaylight 10.0 → 10.6 h
Jeju's 12 months iBest: May, June and October
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Trip typesBeach Poorcool seaSightseeing on foot Finecold
Humidity69%0 muggy days
Clear days3 days15 overcast days
Mean wind16 km/h1 windy day
Sea temperature15.7°15.3-16.4° by year (last 6)
Sunrise / sunset (15th)07:38 / 17:48Daylight 10.0 → 10.6 h
Jeju in January
The coldest and gloomiest month in Jeju City, with the least sunshine of the year. Wind off the sea brings snow showers on some days, and heavy snow on Hallasan can close the 1100 Road and 516 Road to all traffic. On windy days ferries are cancelled and flights run late. Pack a windproof coat and a hat.
Highs of 9°C and lows of 4°C. It was cold, and it felt colder once the sun went down. Day and night differed by only 5°C, so one outfit worked from breakfast to late dinner. 8 rain days in a typical January: noticeable, but most days stayed dry. Most years sat near the average of 8, though 2013 dipped to 2 and 2007 climbed to 12.
With as little as 10.0 hours of daylight, the sightseeing day was short and dinner came after dark. Nights dropped below 0°C on 2 days of the month on average, so early-morning paths could be icy. Cold snaps happened: the record low for January was −4.2°C, set in 2016.
How long it rained
On a rainy day it rained for about 4.1 hours. Rain came at any time of day.
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Typhoonsi No tropical storm passed within 300 km in this month over the last 20 years. Typhoons: June to November
Over the past 20 years January averaged 8 rain days (1 mm or more) out of 31. Individual years ran from 2 in the driest to 12 in the wettest.
What should I wear in Jeju in January?
Days averaged 9°C and nights 4°C. Pack a compact umbrella and a warm coat.
Can you swim in Jeju in January?
Sea surface temperature averaged 15.7°C in January, too cold for most people without a wetsuit. Year to year it ranged 15.3-16.4°C. Check local flags for waves and jellyfish on the day.
Is January a good time to visit Jeju?
On warmth and rain days alone, Jeju's easiest months were May, June and October. January ranked 10 of 12.
How many clear days does Jeju get in January?
About 3 clear days (under 30% cloud on average) and 15 overcast days (80% or more).