London · December
Run in the midday.
Cold: average high 48°F, low 39°F. Layering becomes the workout. Humidity averages 88% — the limiting factor on most runs. Expect 17 rain days — plan around the radar. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
Avg high / low
48° / 39°F
Humidity
88%
Rain days
17/mo
Wind
15 mph
What December feels like in London
Sunrise
08:58
Mid-month average
Sunset
16:54
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in London in December
The kit for December in London: a long-sleeve or light jacket for the first mile, a wind-blocking layer for exposed routes, a water-resistant cap or jacket on standby.
December vs the surrounding months
vs November
-3° avg high
0 rain days
London in November →
December
48°F avg high
17 rain days
Best: midday
vs January
+2° avg high
0 rain days
London in January →
Frequently Asked Questions
What is the best time of day to run in London in December?+
Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
What's the average temperature in London in December?+
Average high 48°F, average low 39°F.
How does December compare to surrounding months in London?+
Compared to November (avg high 52°F), December is cooler. Compared to January (avg high 46°F), December is warmer.
Does it rain often in London in December?+
Expect about 17 measurable rain days in December, on average.