Pack or skip
Flip-flops for Busan in September
Verdict
Optional
Warm enough to wear in the evening or on the beach; not on a city walking day.
Why
Busan in September averages highs of 77°F, lows of 66°F, 10 rainy days.
That climate makes flip-flops a judgment call. Warm enough to wear in the evening or on the beach; not on a city walking day.