Pack or skip
Umbrella for Hilo in September
Verdict
Pack it
Around 15 rainy days across the month — an umbrella earns its space.
Why
Hilo in September averages highs of 82°F, lows of 65°F, 15 rainy days.
That climate means an umbrella earns its space in the bag. Around 15 rainy days across the month — an umbrella earns its space.