San Francisco · December
Run in the morning.
Cool month: average high 56°F, low 46°F. Humidity averages 81% — the limiting factor on most runs. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
56° / 46°F
Humidity
81%
Rain days
13/mo
Wind
13 mph
What December feels like in San Francisco
Sunrise
08:17
Mid-month average
Sunset
17:53
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 San Francisco in December
The kit for December in San Francisco: a long-sleeve or light jacket for the first mile, a water-resistant cap or jacket on standby.
December vs the surrounding months
vs November
-6° avg high
+6 rain days
San Francisco in November →
December
56°F avg high
13 rain days
Best: morning
vs January
-1° avg high
+2 rain days
San Francisco in January →
Frequently Asked Questions
What is the best time of day to run in San Francisco in December?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in San Francisco in December?+
Average high 56°F, average low 46°F.
How does December compare to surrounding months in San Francisco?+
Compared to November (avg high 62°F), December is cooler. Compared to January (avg high 57°F), December is cooler.
Does it rain often in San Francisco in December?+
Expect about 13 measurable rain days in December, on average.