Pack or skip
Sunscreen for San Jose in September
Verdict
Pack it
Sun still finds you at 84°F — UV doesn't care about temperature.
Why
San Jose in September averages highs of 84°F, lows of 59°F, 1 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 84°F — UV doesn't care about temperature.