Yosemite in September: Crowds, Weather & What to Pack
Peak crowds · VisitWhen score 60/100 · #8 of 12 months
September is peak season — the 4th-busiest month of the year, at Yosemite National Park: crowds run 88% of the August peak (472,983 average visits). Weather: highs average 83°F and lows 51°F, with 0.4″ of precipitation and 12.5 hours of daylight. Computed from NPS and NOAA data.
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Bring for Yosemite in September
- A light layer you can shed by midday (long sleeve or windbreaker)See it on AmazonWhy: a 32°F swing between the average low of 51°F and high of 83°F.
- Sun protection and 2L+ water per personSee it on AmazonWhy: highs average 83°F.
- Sturdy, broken-in hiking bootsSee it on AmazonWhy: every park, every month.
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Yosemite in September: what the park service says
In September, Yosemite's high roads, Tioga Road and Glacier Point Road, stay open until snow closes them, which the park service says happens sometime in November. No timed reservation was needed to enter in 2026; the park instead manages busy days with traffic monitoring and parking control, and it asks visitors to favour weekdays and plan weekends early. In Yosemite Valley, September afternoons average about 83°F and nights about 51°F, with very little rain, on the park's 1991-2020 averages.
Source: NPS 1, NPS 2, NPS 3, checked 2026-11-05.
Crowds in September
Yosemite averages 472,983 recreation visits in September — 88% of what August, 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 83°F), and nights stay mild (lows average 51°F). It is typically dry (0.4″ of precipitation). Mid-month daylight runs 12.5 hours.
NOAA 1991–2020 monthly normals, station YOSEMITE PARK HQ, CA US (3 mi from park coordinates, 4,018 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.
What to pack for Yosemite 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 32°F swing between the average low of 51°F and high of 83°F
- Sun protection and 2L+ water per person — highs average 83°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 Yosemite 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 Yosemite crowded in September?
Yes — September runs 88% of Yosemite's peak, averaging 472,983 recreation visits (NPS, 2021–2025). See every month at Yosemite.
What is the weather like in Yosemite in September?
Average highs of 83°F, lows of 51°F, 0.4″ of precipitation (NOAA 1991–2020 normals, YOSEMITE PARK HQ, CA US station). Compare it with other national parks in September.
What should I pack for Yosemite in September?
A light layer you can shed by midday (long sleeve or windbreaker); Sun protection and 2L+ water per person; Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page. Going in October instead? Yosemite in October has its own list.
See also: the best national parks to visit in September · Last verified 2026-09-24