Pack or skip
Beanie for Hilo in April
Verdict
Skip it
Lows near 63°F — no scenario where you'll want one.
Why
Hilo in April averages highs of 80°F, lows of 63°F, 17 rainy days.
That climate means a beanie isn't pulling its weight. Lows near 63°F — no scenario where you'll want one.