How Crowded Is Haleakalā in May?
May is an average month at Haleakalā National Park, running about 1.1× the park's average month — roughly 9% of the year's visitors come in May. That puts it between the July peak and the November low. Overall our best-time score rates May as "Poor" for a visit. Typical May weather averages a high near 63°F and a low around 46°F, with about 2.4" of precipitation. You'll get about 13.0 hours of daylight to explore.
Frequently Asked Questions
May is average at Haleakalā National Park (about 1.1× the average month). Our best-time score rates it "Poor". The single best month overall is September.
The busiest month is July and the quietest is November. May sits at about 1.1× the park's average, or 9% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.