Great Basin in September: Crowds, Weather & What to Pack
Peak crowds · VisitWhen score 61/100 · #11 of 12 months
September is peak season — the 3rd-busiest month of the year, at Great Basin National Park: crowds run 94% of the July peak (24,632 average visits). Weather: highs average 73°F and lows 48°F, with 1.1″ of precipitation and 12.5 hours of daylight. Computed from NPS and NOAA data.
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Bring for Great Basin in September
- A light layer you can shed by midday (long sleeve or windbreaker)See it on AmazonWhy: a 26°F swing between the average low of 48°F and high of 73°F.
- Sturdy, broken-in hiking bootsSee it on AmazonWhy: every park, every month.
- Water bottles for the daySee it on AmazonWhy: hydration is one of the NPS Ten Essentials.
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Great Basin in September: what the park service says
September is when Great Basin's aspens start turning: the park service says fall colour typically develops from about the second or third week of the month, in yellow, red and gold groves along the mountains. Fall also brings cool air, quiet trails and roomy campsites, without the summer crowds. Cave tour visitors go through white-nose syndrome screening at the Lehman Caves Visitor Center, so leave behind anything that has been in another cave.
Source: NPS 1, NPS 2, checked 2026-11-05.
Crowds in September
Great Basin averages 24,632 recreation visits in September — 94% of what July, the peak month, draws. 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 73°F), and nights stay mild (lows average 48°F). It is typically dry (1.1″ of precipitation). Mid-month daylight runs 12.5 hours.
NOAA 1991–2020 monthly normals, station GREAT BASIN NP, NV US (0 mi from park coordinates, 6,850 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.
What to pack for Great Basin in September
Computed from the month's weather normals above — not a generic list.
- A light layer you can shed by midday (long sleeve or windbreaker) — a 26°F swing between the average low of 48°F and high of 73°F
- Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
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Want quieter or kinder conditions? The computed best months for Great Basin are March and 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 Great Basin crowded in September?
Yes — September runs 94% of Great Basin's peak, averaging 24,632 recreation visits (NPS, 2021–2025). See every month at Great Basin.
What is the weather like in Great Basin in September?
Average highs of 73°F, lows of 48°F, 1.1″ of precipitation (NOAA 1991–2020 normals, GREAT BASIN NP, NV US station). Compare it with other national parks in September.
What should I pack for Great Basin in September?
A light layer you can shed by midday (long sleeve or windbreaker); Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page. Going in October instead? Great Basin in October has its own list.
See also: the best national parks to visit in September · Last verified 2026-09-24