What to Wear in Hilo in September
Hilo in September sits firmly in the wet season, making it one of the rainiest months in an already notoriously rainy city. Daytime temperatures hover between 75°F and 83°F (24°C–28°C), with overnight lows dipping to around 68°F–72°F (20°C–22°C). The humidity is consistently high, and rain showers can arrive quickly and without much warning — Hilo averages over 10 inches of rainfall in September alone. This isn't the kind of rain that passes in minutes; downpours can last hours, especially on the windward side of the Big Island. Dress in lightweight, moisture-wicking fabrics like linen blends or technical travel shirts that dry fast when wet. A packable, waterproof rain jacket is non-negotiable — umbrellas work but struggle in the wind. Opt for water-resistant sandals or quick-dry sneakers rather than leather footwear, which will stay damp for days. Shorts and breathable trousers are ideal for the heat and humidity. If you plan to visit Hawaii Volcanoes National Park, bring a light fleece layer, as the crater elevation at Kilauea can feel noticeably cooler and foggier. Sunscreen still matters — UV exposure is high even on overcast days at this latitude.
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Frequently Asked Questions
What to wear in Hilo in September?+
Wear lightweight, quick-drying clothing such as moisture-wicking shirts, shorts, and breathable trousers. Always carry a packable waterproof rain jacket, as heavy showers are frequent throughout the day. Water-resistant sandals or quick-dry shoes are strongly recommended over leather or canvas footwear that absorbs moisture and stays wet.
Is Hilo cold in September?+
No, Hilo is warm and humid in September with daytime highs reaching 83°F (28°C) and overnight lows around 68°F–72°F (20°C–22°C). You won't need heavy clothing in the town itself. However, if you're visiting Hawaii Volcanoes National Park, bring a light fleece or layer, as the higher elevation at Kilauea Caldera can feel significantly cooler and windier.
Does it rain in Hilo in September?+
Yes, significantly. Hilo is one of the wettest cities in the United States, and September is a particularly rainy month with rainfall often exceeding 10 inches. Expect frequent, heavy showers that can last several hours, not just brief tropical sprinkles. Planning outdoor activities for the morning hours typically gives you the best chance of drier conditions.
What should I pack for Hilo in September?+
Pack quick-dry shorts, lightweight shirts, a swimsuit, and a mandatory waterproof rain jacket. Water-resistant sandals like Tevas or Chacos are practical for wet sidewalks and trails. Include reef-safe sunscreen, insect repellent for rainforest hikes, and a light fleece if you plan to visit Hawaii Volcanoes National Park. Leave heavy jeans and leather shoes at home — they won't dry in the humidity.