San Jose · December
Run in the morning.
Cool month: average high 58°F, low 44°F. Humidity averages 76% — the limiting factor on most runs. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
58° / 44°F
Humidity
76%
Rain days
12/mo
Wind
8 mph
What December feels like in San Jose
Sunrise
08:14
Mid-month average
Sunset
17:52
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 Jose in December
The kit for December in San Jose: 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
-8° avg high
+5 rain days
San Jose in November →
December
58°F avg high
12 rain days
Best: morning
vs January
-2° avg high
+2 rain days
San Jose in January →
Frequently Asked Questions
What is the best time of day to run in San Jose in December?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in San Jose in December?+
Average high 58°F, average low 44°F.
How does December compare to surrounding months in San Jose?+
Compared to November (avg high 66°F), December is cooler. Compared to January (avg high 60°F), December is cooler.
Does it rain often in San Jose in December?+
Expect about 12 measurable rain days in December, on average.