What to Wear in San Jose in Winter: Month-by-Month Outfit Guide
San Jose in winter sits in the 40 to 65°F range. This is the layer-by-layer outfit guide for San Jose's winter weather — what to wear, what to pack for a visit, and the local context that shapes the recommendations.
WHAT TO EXPECT
San Jose in winter — December, January, February. December through February. 60-65°F days, 40-50°F nights. Light layers. The temperature range is the headline; what you actually feel depends on humidity, wind, and what indoor spaces you'll cycle through.
THE FOUNDATION LAYER
A standard cotton or synthetic shirt is fine, with a long sleeve for the cold end of the range. The base layer is comfort, not survival.
THE MID LAYER
A cardigan, light fleece, or vest — pick based on whether you'll be active or stationary outdoors.
THE OUTERWEAR
Trench coat, light wool blazer, denim jacket, or a packable shell. Layer the outerwear, don't replace it.
ACCESSORIES
A scarf for cool mornings, a packable umbrella, and shoes you can walk in for an hour.
WHAT TO PACK FOR A TRIP TO SAN JOSE IN WINTER
Three layer permutations covering the 40 to 65°F range, plus accessories. If your trip spans the season's edge (late November or early March), pack toward the cooler end of the range — overestimating warmth is easier to recover from than underestimating.
LOCAL CONTEXT
Inland Bay Area is warmer and drier than coastal SF. Tech industry casual dress code dominates.