Badlands in September: Crowds, Weather & What to Pack
Shoulder · VisitWhen score 74/100 · #5 of 12 months
September is a solid shoulder-season month to visit Badlands National Park: crowds run 56% of the July peak (137,202 average visits). Weather: highs average 79°F and lows 47°F, with 1.2″ of precipitation and 12.6 hours of daylight. Computed from NPS and NOAA data.
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Bring for Badlands 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 47°F and high of 79°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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Badlands in September: what the park service says
September eases Badlands' heat, with average highs near 81°F and nights in the low 50s, and about an inch of rain. The park says weather here is variable and unpredictable all year, so pack layers for cool mornings. Entrance fees are collected all year, and the park is open 24 hours a day. At the Ben Reifel Visitor Center you can see the working Fossil Preparation Lab and pick up Junior Ranger booklets.
Source: NPS 1, NPS 2, checked 2026-11-05.
Crowds in September
Badlands averages 137,202 recreation visits in September — 56% of what July, the peak month, draws. That crowd level sets the tone for parking, permits and lodging.
Weather & daylight
Days are pleasant (highs average 79°F), and nights stay mild (lows average 47°F). It is typically dry (1.2″ of precipitation). Mid-month daylight runs 12.6 hours.
NOAA 1991–2020 monthly normals, station WASTA, SD US (22 mi from park coordinates, 2,328 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.
What to pack for Badlands 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 47°F and high of 79°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 Badlands are April and May.
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 Badlands crowded in September?
Moderately: September runs 56% of the July peak, averaging 137,202 visits (NPS, 2021–2025). See every month at Badlands.
What is the weather like in Badlands in September?
Average highs of 79°F, lows of 47°F, 1.2″ of precipitation (NOAA 1991–2020 normals, WASTA, SD US station). Compare it with other national parks in September.
What should I pack for Badlands 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? Badlands in October has its own list.
See also: the best national parks to visit in September · Last verified 2026-09-24