Pack or skip
Sunscreen for Tucson in September
Verdict
Pack it
Sun still finds you at 92°F — UV doesn't care about temperature.
Why
Tucson in September averages highs of 92°F, lows of 68°F, 7 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 92°F — UV doesn't care about temperature.