Pack or skip
Sunscreen for San Antonio in December
Verdict
Pack it
Sun still finds you at 63°F — UV doesn't care about temperature.
Why
San Antonio in December averages highs of 63°F, lows of 41°F, 7 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 63°F — UV doesn't care about temperature.