Pack or skip
Sunscreen for San Jose in December
Verdict
Pack it
Sun still finds you at 57°F — UV doesn't care about temperature.
Why
San Jose in December averages highs of 57°F, lows of 41°F, 8 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 57°F — UV doesn't care about temperature.