Hilo weather in May
May in Hilo: warm, soaked, with clean air — a great time to visit.
#4 of 12 months in Hilo · #451 of 604 destinations to visit in May · comfort 71/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Hilo climate normals — May
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 20°C / 68°F | |
| Feels like (high) | 28°C / 82°F | |
| Rainfall | 241 mm / 9.5 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 19°C / 67°F | |
| Sunshine | 11.7 h/day | |
| Daylight | 13.1 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 26 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Hilo?
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Hilo in May — FAQ
- Is May a good time to visit Hilo?
- May in Hilo: warm, soaked, with clean air — a great time to visit. It ranks #4 of 12 months for Hilo on SeasonMap's comfort score (71/100).
- What is the weather like in Hilo in May?
- In May, Hilo averages a daily high of 25°C and a low of 19.9°C, with about 240.7 mm of rain over roughly 26 rainy days.
- What is the air quality in Hilo in May?
- Hilo has a mean US Air Quality Index of about 26 in May.