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Big Bend National Park in September

As the summer heat starts to wane, September emerges as a bridge connecting the scorching Texas summer to its relatively milder winter.
Rio Grande in Big Bend National Park

Big Bend National Park is a vast expanse of raw, unadulterated wilderness. 

It nestles within the heart of Texas, offering an unparalleled display of North American nature at its finest. 

Among the twelve months of the calendar, it is September that holds a unique charm within its confines. 

As the summer heat starts to wane, September emerges as a bridge connecting the scorching Texas summer to its relatively milder winter, offering a unique blend of climatic and biological changes within the park. 

Big Bend National Park View Valley
Source: dreamstime

Geographic Location and Landscape

Encompassing over 800,000 acres, Big Bend National Park lies along the Texas-Mexico border, cradled within a grand curve of the Rio Grande River— a fact that gives the park its evocative name. 

The park’s terrain is as diverse as it is expansive, ranging from the river’s riparian zone to the arid desert and the soaring Chisos Mountains. 

Each of these zones is home to distinct ecosystems and contributes to the park’s multifaceted character.

Big Bend’s dramatic landscapes are born out of its unique geographical placement. 

Its position between the temperate North and the tropic South allows for a rare blending of species. 

Moreover, the drastic elevation changes— from around 1,800 feet along the river to 7,832 feet at Emory Peak in the Chisos Mountains— further diversify its ecosystems.

Big Bend National Park Texas Rio Grande View
Source: dreamstime

Climate in September

As September unfolds, the grip of the scorching Texan summer starts to loosen on Big Bend. 

The park transitions from the searing heat of August, with temperatures that often soar above 100°F (37.8°C), to the milder but still warm days of September, where the average high hovers around 87°F (30.6°C), and lows drop to approximately 65°F (18.3°C)

It’s a refreshing change that provides respite to the park’s inhabitants and visitors alike.

September also marks the tail-end of the monsoon season in Big Bend. 

Average rainfall during this month ranges between 1.5 to 2 inches, significantly higher than the annual monthly average of around 0.6 inches. 

The increased precipitation breathes life into the arid desert, fostering an ephemeral burst of lush greenery and filling the park’s waterholes. 

This replenishment of water resources is vital for the park’s flora and fauna as they prepare for the drier months ahead.

Visitor Numbers in September

The visitation trend to Big Bend National Park in September bears the influence of the transitioning climate. 

September visitation numbers from 2017 to 2022 show a distinct pattern. 

After the peak visitation in spring (March), the numbers dip significantly in the hot summer months (June to August). 

Big Bend National Park Visitation Table and Diagram
Source: NPS – Big Bend Visitation

However, as September arrives with its milder weather, visitor numbers start to climb again.

In 2022, Big Bend welcomed 23,710 visitors in September, a noticeable increase from the 14,915 visitors in August. 

Similar trends are observed in the previous years too, with 28,985 visitors in September 2021 compared to 20,207 in August.

While these numbers are still lower than the spring peak, they underscore the growing popularity of September as a desirable month for visiting Big Bend. 

Moreover, given the vastness of the park, these visitation numbers translate to a sense of having the wilderness almost to oneself, providing an intimate experience with nature that is hard to find elsewhere.

Flora and Fauna

A colorful lizard perches on a rock and soaks up the Springtime sun at Big Bend National Park in Brewster County, TX
Source: dreamstime

The transient period of September, where summer yields to the first hints of autumn, brings about significant changes in Big Bend’s biological sphere. 

While the park is home to more than 1,200 plant species, 450 species of birds, 75 species of mammals, and 56 species of reptiles, the changing season influences the patterns of wildlife activity.

In September, the fall bloom season commences. 

The rains of the preceding months trigger an eruption of color in the otherwise stark desert landscape. 

Species such as the purple sage, ocotillo, and various cacti showcase their vibrant blooms, painting the park with hues of red, orange, and purple.

The cooler temperatures also activate the fauna. 

Creatures that sought refuge from the summer heat now begin to emerge. 

Species like the mule deer, jackrabbits, and desert cottontails become more active. 

Birdwatchers can delight in the migration season as a variety of species pass through the park. 

Raptors such as hawks and eagles can be sighted soaring against the backdrop of the clear blue sky, while hummingbirds flit from flower to flower.

Activities in September

the 1,500 foot cliffs of the canyon in Big Bend National Park - a person pulls a canoe
Source: unsplash

With its vast territory and diverse ecosystems, Big Bend National Park offers a wealth of activities for visitors in September.


The park boasts over 150 miles of trails, ranging from short, easy paths to strenuous, multi-day hikes. 

The decreased heat in September allows for more comfortable trekking. 

Visitors can explore the Santa Elena Canyon, venture to the summit of Emory Peak, or take a leisurely stroll on the Window View Trail.


Big Bend offers three developed campgrounds and numerous backcountry sites for a true wilderness experience. 

The mild weather in September is particularly suitable for camping under the star-studded sky.

River Trips

The Rio Grande offers opportunities for canoeing, kayaking, or even rafting. 

A river trip down the Santa Elena or Mariscal Canyon in September, when water levels are usually higher due to recent rains, is a breathtaking experience.

Horseback Riding

Several outfitters around the park offer guided horseback tours. 

Riding through the desert at sunset, with the Chisos Mountains silhouetted against the sky, is a memory to cherish.

Wildlife Viewing

With increased wildlife activity, September is a great time for wildlife viewing. 

Visitors can spot a range of creatures from the roadrunners scurrying across the trails to the javelinas rustling through the undergrowth.

What to Wear in September

Hike in Big Bend National Park, Texas, USA
Source: dreamstime

When planning a visit to Big Bend in September, it’s crucial to pack appropriately for the variable weather conditions. 

During the day, temperatures remain warm, so lightweight, breathable clothing is recommended. 

As nights can get significantly cooler, packing layers is essential.

Hats, sunglasses, and sunscreen are must-haves for protection against the still-strong Texan sun. 

For those planning to hit the trails, sturdy hiking shoes are a necessity. 

If a river trip is on the agenda, don’t forget a swimsuit and quick-drying clothes.

Tips for Visiting in September

Landscape of the Milky Way Galaxy rising over the silhouette of the Chisos Basin in Big Bend National Park Texas
Source: dreamstime

While Big Bend in September offers a unique charm, certain tips can help optimize the visitor experience.

  1. Stay Hydrated: Despite the decrease in heat, the dry desert climate can be dehydrating. Carry plenty of water, especially while hiking or engaging in strenuous activities.
  2. Start Early: The sunrises in Big Bend are surreal, and starting early helps avoid the peak daytime heat.
  3. Respect Wildlife: Keep a safe distance from all wildlife. Remember, this is their home.
  4. Leave No Trace: As responsible visitors, it’s important to preserve the park’s natural beauty. Carry out all trash, stay on designated trails, and avoid picking plants or disturbing rocks.
  5. Prepare for Variable Weather: Weather can be unpredictable in September, with warm days and cool nights, even the occasional rain shower. Check the weather forecast regularly and plan your activities accordingly.
  6. Reserve Ahead: Although September isn’t peak season, it’s still advisable to book campsites or lodging in advance due to the park’s growing popularity.
  7. Pack Essentials: Remember to pack all necessary items such as a first aid kit, map, compass, and snacks, especially if you plan on hiking or camping.

With its diverse landscape and rich biodiversity, Big Bend National Park stands as a testament to North America’s captivating wilderness. 

A visit in September offers the chance to witness the park’s unique seasonal transition, framed by mild weather and relatively fewer crowds. 

Whether you wish to traverse the rugged trails, float down the Rio Grande, or gaze at the stars from a serene campsite, Big Bend in September guarantees an unforgettable encounter with nature’s extraordinary wonders.

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