Pack or skip
Insect repellent for Michigan City in September
Verdict
Pack it
Warm (73°F) plus 8 rainy days = mosquito conditions.
Why
Michigan City in September averages highs of 73°F, lows of 55°F, 8 rainy days.
That climate means insect repellent earns its space in the bag. Warm (73°F) plus 8 rainy days = mosquito conditions.