Pack or skip
Insect repellent for Busan in September
Verdict
Pack it
Warm (77°F) plus 10 rainy days = mosquito conditions.
Why
Busan in September averages highs of 77°F, lows of 66°F, 10 rainy days.
That climate means insect repellent earns its space in the bag. Warm (77°F) plus 10 rainy days = mosquito conditions.