Verdict: Fair month
Seoul Weather in December
December is properly cold in Seoul, with highs of only 3°C (37°F). Rain is a non-issue, with only ~3 wet days in an average year. December is workable in Seoul if your dates are fixed — just plan around the conditions.
Average high
3°C / 37°F
Average low
-6°C / 21°F
Rain days
~3
Precipitation
22 mm
What to pack for Seoul in December
- Full winter kit — insulated coat, gloves, warm hat
- Comfortable walking shoes — every guide on this site assumes you'll use them
December against the rest of the year
Warmest in Seoul: Jul (29°C / 84°F) · Coolest: Jan (2°C / 36°F) · Wettest: Jul (~20 rain days)
2°
-7°
Jan
6°
-4°
Feb
12°
0°
Mar
18°
7°
Apr
22°
12°
May
27°
18°
Jun
29°
22°
Jul
29°
23°
Aug
26°
18°
Sep
18°
9°
Oct
12°
2°
Nov
3°
-6°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)