Pack or skip
Insect repellent for Mexico City in September
Verdict
Pack it
Warm (73°F) plus 15 rainy days = mosquito conditions.
Why
Mexico City in September averages highs of 73°F, lows of 52°F, 15 rainy days.
That climate means insect repellent earns its space in the bag. Warm (73°F) plus 15 rainy days = mosquito conditions.