Verdict: Tough month
Jeju Weather in January
January is properly cold in Jeju, with highs of only 8°C (46°F). It's also the wet side of the calendar: rain falls on about 16 days, so build flexibility into plans. If your dates are flexible, most travelers will have a better time in Jeju outside January.
Average high
8°C / 46°F
Average low
3°C / 37°F
Rain days
~16
Precipitation
128 mm
What to pack for Jeju in January
- A proper warm jacket, and a hat for mornings
- Rain gear is non-negotiable — expect rain on roughly 16 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
January against the rest of the year
Warmest in Jeju: Aug (30°C / 86°F) · Coolest: Jan (8°C / 46°F) · Wettest: Jul (~20 rain days)
8°
3°
Jan
10°
4°
Feb
14°
7°
Mar
17°
11°
Apr
22°
15°
May
25°
20°
Jun
29°
24°
Jul
30°
25°
Aug
26°
22°
Sep
21°
16°
Oct
16°
11°
Nov
9°
5°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)