Hawaiʻi Volcanoes in September: Crowds, Weather & What to Pack
Peak crowds · VisitWhen score 51/100 · #3 of 12 months
September is peak season — the 10th-busiest month of the year, at Hawaiʻi Volcanoes National Park: crowds run 77% of the December peak (116,627 average visits). Weather: highs average 78°F and lows 61°F, with 16.1″ of precipitation and 12.3 hours of daylight. Computed from NPS and NOAA data.
Planning Hawaiʻi Volcanoes? Pack a guidebook: Moon Best of Big Island of Hawaii on Amazon. · affiliate link, VisitWhen earns from qualifying purchases
Bring for Hawaiʻi Volcanoes in September
- Rain shell + pack coverSee it on AmazonWhy: 16.1″ of precipitation is normal this month.
- Waterproof bootsSee it on AmazonWhy: 16.1″ of precipitation is normal this month.
- Water bottles for the daySee it on AmazonWhy: hydration is one of the NPS Ten Essentials.
Affiliate links: VisitWhen earns from qualifying purchases, at no extra cost to you. Prices can change; Amazon shows the current one.
Crowds in September
Hawaiʻi Volcanoes averages 116,627 recreation visits in September — 77% of what December, the peak month, draws — this is the third-quietest month of the year. That crowd level sets the tone for parking, permits and lodging — book early and start days at dawn.
Weather & daylight
Days are pleasant (highs average 78°F), and nights stay mild (lows average 61°F). This is one of the wetter months (16.1″ of precipitation on average). Mid-month daylight runs 12.3 hours.
NOAA 1991–2020 monthly normals, station GLENWOOD #2 55.4, HI US (8 mi from park coordinates, 2,200 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.
What to pack for Hawaiʻi Volcanoes in September
Computed from the month's weather normals above — not a generic list.
- Rain shell + pack cover — 16.1″ of precipitation is normal this month
- Waterproof boots — plus navigation and a basic first-aid kit — 16.1″ of precipitation is normal this month
As an Amazon Associate, VisitWhen earns from qualifying purchases. Gear names above link to Amazon searches or to a specific product — we don't show or set prices; you always see Amazon's current price.
Want quieter or kinder conditions? The computed best month for Hawaiʻi Volcanoes is April.
Also at their best in September
Other parks whose computed September verdict is a best window — same NPS × NOAA formula:
- Wrangell–St. Elias in September — 25% of peak crowds, highs 56°F, score 84/100
- Guadalupe Mountains in September — 35% of peak crowds, highs 80°F, score 81/100
- Gateway Arch in September — 29% of peak crowds, highs 81°F, score 80/100
- Isle Royale in September — 39% of peak crowds, highs 65°F, score 79/100
Common questions
Is Hawaiʻi Volcanoes crowded in September?
Yes — September runs 77% of Hawaiʻi Volcanoes's peak, averaging 116,627 recreation visits (NPS, 2021–2025). See every month at Hawaiʻi Volcanoes.
What is the weather like in Hawaiʻi Volcanoes in September?
Average highs of 78°F, lows of 61°F, 16.1″ of precipitation (NOAA 1991–2020 normals, GLENWOOD #2 55.4, HI US station). Compare it with other national parks in September.
What should I pack for Hawaiʻi Volcanoes in September?
Rain shell + pack cover; Waterproof boots — plus navigation and a basic first-aid kit — the full weather-computed list is on this page. Going in October instead? Hawaiʻi Volcanoes in October has its own list.
See also: the best national parks to visit in September · Last verified 2026-09-24