Pack or skip
Sunscreen for Mexico City in September
Verdict
Pack it
Sun still finds you at 73°F — UV doesn't care about temperature.
Why
Mexico City in September averages highs of 73°F, lows of 52°F, 15 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 73°F — UV doesn't care about temperature.