Pack or skip
Sunscreen for Washington DC in October
Verdict
Pack it
Sun still finds you at 70°F — UV doesn't care about temperature.
Why
Washington DC in October averages highs of 70°F, lows of 52°F, 8 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 70°F — UV doesn't care about temperature.