Pack or skip
Sunscreen for Busan in January
Verdict
Pack it
Sun still finds you at 45°F — UV doesn't care about temperature.
Why
Busan in January averages highs of 45°F, lows of 33°F, 6 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 45°F — UV doesn't care about temperature.