Haleakalā in September: Crowds, Weather & What to Pack
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September is one of the best months of the year to visit Haleakalā National Park: crowds run 85% of the July peak (69,572 average visits), days average 65°F with 12.3 hours of daylight. Computed from NPS and NOAA data.
Crowds in September
Haleakalā averages 69,572 recreation visits in September — 85% of what July, the peak month, draws. Trailheads and parking fill accordingly — book early and start days at dawn.
Weather & daylight
Days are mild (highs average 65°F), and nights stay mild (lows average 48°F). Average precipitation is 2.5″ for the month. Mid-month daylight runs 12.3 hours.
NOAA 1991–2020 monthly normals, station HALEAKALA RS 338, HI US (7 mi from park coordinates, 6,962 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.
What to pack for Haleakalā in September
Computed from the month's weather normals above — not a generic list.
- Packable rain jacket — 2.5″ of precipitation is normal this month
- Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
Common questions
Is Haleakalā crowded in September?
Yes — September runs 85% of Haleakalā's peak, averaging 69,572 recreation visits (NPS, 2021–2025).
What is the weather like in Haleakalā in September?
Average highs of 65°F, lows of 48°F, 2.5″ of precipitation (NOAA 1991–2020 normals, HALEAKALA RS 338, HI US station).
What should I pack for Haleakalā in September?
Packable rain jacket; Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page.
See also: the best national parks to visit in September · Last verified 2026-07-16