Pack or skip
Sunscreen for San Francisco in May
Verdict
Pack it
Sun still finds you at 65°F — UV doesn't care about temperature.
Why
San Francisco in May averages highs of 65°F, lows of 52°F, 4 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 65°F — UV doesn't care about temperature.