Pack or skip
Sunscreen for Busan in October
Verdict
Pack it
Sun still finds you at 69°F — UV doesn't care about temperature.
Why
Busan in October averages highs of 69°F, lows of 56°F, 7 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 69°F — UV doesn't care about temperature.