How Crowded Is Haleakalā National Park in September?

September runs about 1× Haleakalā National Park's average month, which makes it an average month here — roughly 8% of the park's yearly visitors come in September.

In a typical September the park sees about 82,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 8th-busiest of the park's twelve months, sitting between the July peak (1.1×) and the November low (0.9×).

On our Best Time to Visit score September rates 58/100 ("Fair") — the single best-rated month at Haleakalā, balancing crowds against weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 65°F and an overnight low around 48°F, with about 2.5" of precipitation.

That average of about 56°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 27% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.1 hours of daylight in September to explore — between the 10.7-hour midwinter low and the 13.3-hour summer high.

Park-wide, 2025 drew 853,711 recreation visits, up 16.6% from 732,477 in 2024.

Across the past decade overall visitation has eased about 23.3%, so September may feel a touch quieter than it once did.