Pack or skip
Sunscreen for San Francisco in October
Verdict
Pack it
Sun still finds you at 68°F — UV doesn't care about temperature.
Why
San Francisco in October averages highs of 68°F, lows of 55°F, 5 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 68°F — UV doesn't care about temperature.