Seoul · December
Run in the midday.
Cold: average high 38°F, low 22°F. Layering becomes the workout. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
Avg high / low
38° / 22°F
Humidity
63%
Rain days
8/mo
Wind
10 mph
What December feels like in Seoul
Sunrise
07:39
Mid-month average
Sunset
17:16
Mid-month average
Time-of-day breakdown
Morning
Steady cool air, low wind, and good light. The standard runner window in most months.
Midday
Often the warmest few hours of a cold day. If you can only run once, midday gives you the most temperate window.
Evening
Cold drops back in fast after sunset. Tight window — done before headlamp territory.
What to wear running in Seoul in December
The kit for December in Seoul: cold-weather layers, gloves, and ear coverage on most mornings.
December vs the surrounding months
vs November
-14° avg high
-2 rain days
Seoul in November →
December
38°F avg high
8 rain days
Best: midday
vs January
+2° avg high
+2 rain days
Seoul in January →
Frequently Asked Questions
What is the best time of day to run in Seoul in December?+
Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
What's the average temperature in Seoul in December?+
Average high 38°F, average low 22°F.
How does December compare to surrounding months in Seoul?+
Compared to November (avg high 52°F), December is cooler. Compared to January (avg high 36°F), December is warmer.
Does it rain often in Seoul in December?+
Expect about 8 measurable rain days in December, on average.