Zion in September: Crowds, Weather & What to Pack

Peak crowds · VisitWhen score 55/100 · #9 of 12 months

September is peak season — expect the year's biggest crowds at Zion National Park: crowds run 79% of the June peak (476,048 average visits). Weather: highs average 91°F and lows 61°F, with 1.2″ of precipitation and 12.5 hours of daylight. Computed from NPS and NOAA data.

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Crowds in September

Zion averages 476,048 recreation visits in September — 79% of what June, 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 warm (highs average 91°F), and nights stay mild (lows average 61°F). It is typically dry (1.2″ of precipitation). Mid-month daylight runs 12.5 hours.

NOAA 1991–2020 monthly normals, station ZION NP, UT US (1 mi from park coordinates, 4,038 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.

What to pack for Zion 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 29°F swing between the average low of 61°F and high of 91°F
• Sun protection and 2L+ water per person — highs average 91°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 Zion are January and February.

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