Pack or skip
Sunscreen for San Jose in January
Verdict
Pack it
Sun still finds you at 58°F — UV doesn't care about temperature.
Why
San Jose in January averages highs of 58°F, lows of 41°F, 8 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 58°F — UV doesn't care about temperature.