Pack or skip
Sunscreen for Hilo in September
Verdict
Pack it
Sun still finds you at 82°F — UV doesn't care about temperature.
Why
Hilo in September averages highs of 82°F, lows of 65°F, 15 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 82°F — UV doesn't care about temperature.