Pack or skip
Beanie for Hilo in June
Verdict
Skip it
Lows near 65°F — no scenario where you'll want one.
Why
Hilo in June averages highs of 81°F, lows of 65°F, 13 rainy days.
That climate means a beanie isn't pulling its weight. Lows near 65°F — no scenario where you'll want one.