San Diego · December
Run in the morning.
Cool month: average high 64°F, low 49°F. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
64° / 49°F
Humidity
70%
Rain days
8/mo
Wind
10 mph
What December feels like in San Diego
Sunrise
07:43
Mid-month average
Sunset
17:45
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 Diego in December
The kit for December in San Diego: a long-sleeve or light jacket for the first mile.
December vs the surrounding months
vs November
-6° avg high
+3 rain days
San Diego in November →
December
64°F avg high
8 rain days
Best: morning
vs January
0° avg high
+1 rain days
San Diego in January →
Frequently Asked Questions
What is the best time of day to run in San Diego in December?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in San Diego in December?+
Average high 64°F, average low 49°F.
How does December compare to surrounding months in San Diego?+
Compared to November (avg high 71°F), December is cooler. Compared to January (avg high 64°F), December is cooler.
Does it rain often in San Diego in December?+
Expect about 8 measurable rain days in December, on average.