What to Wear in Hilo in May
Hilo in May sits in the heart of its wet season, and this city on the windward side of the Big Island earns its reputation as one of the rainiest cities in the US year-round. Daytime highs typically hover between 78–82°F (25–28°C), while nights drop to a comfortable 65–68°F (18–20°C). Expect frequent short rain showers, often intense but brief, with May averaging around 15–17 inches of rainfall for the month. Humidity is consistently high, which makes lightweight, breathable fabrics essential. Your core outfit strategy should be layers you can add or remove quickly. Opt for moisture-wicking t-shirts or linen tops paired with quick-dry shorts or lightweight pants. A packable, waterproof rain jacket is non-negotiable — an umbrella alone won't cut it when wind-driven rain hits. Skip heavy denim entirely; it stays wet for hours in this humidity. Water-resistant sandals or trail shoes with good grip work better than regular sneakers, which can become waterlogged on Hilo's frequently wet sidewalks and trails. If you're planning to visit Hawaii Volcanoes National Park, about 30 miles away at higher elevation, bring an extra layer since temperatures there can drop to 55°F or lower. Pack light, pack waterproof, and plan for rain every single day.
Curated Looks
No outfits found for this style. Try a different filter.
Other Months in Hilo
Frequently Asked Questions
What to wear in Hilo in May?+
Wear lightweight, moisture-wicking tops and quick-dry shorts or pants to handle Hilo's heat and high humidity. A packable waterproof rain jacket is essential since rain showers occur almost daily. Water-resistant sandals or trail shoes are far more practical than canvas sneakers, which stay wet for hours. Avoid heavy fabrics like denim or thick cotton entirely.
Is Hilo cold in May?+
Hilo is not cold in May — daytime temperatures typically reach 78–82°F (25–28°C) and evenings cool to around 65–68°F (18–20°C). However, if you plan to visit Hawaii Volcanoes National Park or drive up to higher elevations on Mauna Kea, temperatures can drop significantly, sometimes below 50°F, so a mid-layer fleece is worth packing. At sea level in Hilo itself, light clothing is all you need.
Does it rain in Hilo in May?+
Yes, it rains frequently in Hilo in May — the city averages around 15–17 inches of rainfall this month alone, making it one of the wettest periods of the year. Showers are typically short and intense rather than all-day drizzle, so outdoor plans can usually proceed with brief interruptions. A waterproof rain jacket and quick-dry clothing will keep you comfortable between showers.
What should I pack for Hilo in May?+
Pack a packable waterproof rain jacket, moisture-wicking t-shirts, quick-dry shorts or lightweight pants, and water-resistant footwear with good traction. A small travel umbrella is a useful backup. If you plan on hiking, bring a mid-layer fleece for higher-elevation excursions to places like Hawaii Volcanoes National Park. Leave heavy denim and cotton at home — they dry slowly in Hilo's persistent humidity.