Haleakala National Park weather in September
September in Haleakala National Park: cool, a little rain, with clean air — an excellent time to visit.
#6 of 12 months in Haleakala National Park · #133 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Haleakala National Park climate normals — September
| Daytime high | 17°C / 62°F | 🙂 cool |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 15°C / 59°F | |
| Rainfall | 60 mm / 2.4 in | 🌦 some rain |
| Rainy days | 21 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 10°C / 51°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.3 h | |
| Wind | 23 km/h / 14 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Haleakala National Park?
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Haleakala National Park in September — FAQ
- Is September a good time to visit Haleakala National Park?
- September in Haleakala National Park: cool, a little rain, with clean air — an excellent time to visit. It ranks #6 of 12 months for Haleakala National Park on SeasonMap's comfort score (87/100).
- What is the weather like in Haleakala National Park in September?
- In September, Haleakala National Park averages a daily high of 16.8°C and a low of 13°C, with about 60.1 mm of rain over roughly 21.4 rainy days.
- What is the air quality in Haleakala National Park in September?
- Haleakala National Park has a mean US Air Quality Index of about 38 in September.