Pack or skip
Flip-flops for Hilo in December
Verdict
Optional
Warm enough to wear in the evening or on the beach; not on a city walking day.
Why
Hilo in December averages highs of 79°F, lows of 62°F, 22 rainy days.
That climate makes flip-flops a judgment call. Warm enough to wear in the evening or on the beach; not on a city walking day.