Great Basin in September: Crowds, Weather & What to Pack

Peak crowds · VisitWhen score 61/100 · #11 of 12 months

September is peak season — expect the year's biggest crowds 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.

Planning Great Basin? Pack the trail map: Great Basin Trails Illustrated map on Amazon. · affiliate link, VisitWhen earns from qualifying purchases

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

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.

Packing for a trip with a date on it? Amazon Prime includes fast delivery on eligible items, and eligible new members may be offered a free trial, so gear ordered this week can arrive before you leave. Delivery speed varies by item and address. See if you can try Prime free →
Affiliate link — we may earn a commission on qualifying sign-ups, at no extra cost to you. Current terms are on Amazon's page.

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

See also: the best national parks to visit in September · Last verified 2026-09-24