August in Big Bend National Park is a tough month: highs around 94°F, lows around 72°F. Crowds: quiet — #8 busiest of the park's 12 months. Wettest month in the Chisos; flash floods in the arroyos. The editorial best window here is February & April & October–November. You get about 13h 11m of daylight. To finish South Rim Trail (5h) before dark, leave the trailhead by about 3:31 PM.
Month data reviewed · how we check this
| Verdict | Tough Closures, harsh weather or very limited access — plan carefully. |
|---|---|
| Temps °F | 94° high / 72° low |
| Crowds | quiet · #8 busiest of the park's 12 months |
| What August is like | Wettest month in the Chisos; flash floods in the arroyos |
| Best window (whole year) | February & April & October–November |
| Peak crowds (whole year) | Feb–Mar |
CROWDS: RELATIVE SEASONALITY FROM NPS VISITATION STATISTICS · TEMPS: APPROXIMATE NOAA NORMALS AT MAIN VISITOR ELEVATION — HIGH COUNTRY RUNS 10–20°F COLDER
DAYLIGHT ON AUGUST 15 · LOCAL PARK TIME (CDT)COMPUTED FROM THE PARK'S OWN COORDINATES FOR THE 15TH — THE MIDDLE OF THE MONTH STANDS FOR IT, AS IT DOES FOR CLIMATE NORMALS. WITHIN A MONTH THESE TIMES SHIFT BY UP TO AN HOUR
LEAVE THE TRAILHEAD BY — TO FINISH BEFORE DARK ON AUGUST 15WALKING TIMES ESTIMATED FROM EACH TRAIL'S MEASURED DISTANCE AND ELEVATION GAIN — A PLANNING FIGURE, NOT A PACE. ADD YOUR OWN MARGIN FOR PHOTOS, REST AND CROWDS. WATER AT THE HOT-WEATHER RATE, BECAUSE THIS MONTH AVERAGES 94°F. TRAILS WE HAVE NOT MEASURED ARE LEFT OUT RATHER THAN GUESSED
WHAT AUGUST ASKS OF YOU HEREBig Bend National Park in September — Shoulder, highs around 88°F, crowds: quiet (heat eases slowly; the river runs high after the rains).
Our verdict for August is "Tough". Closures, harsh weather or very limited access — plan carefully. Expect highs around 94°F and lows around 72°F, with crowds at the "quiet" level. Temperatures are approximate NOAA normals at the main visitor elevation; crowd levels follow published NPS visitation statistics.
Across the full 12-month review, the best window is February & April & October–November, and the peak-crowd months are Feb–Mar. August itself we rate "Tough".
September we rate "Shoulder" against "Tough" for August, with highs around 88°F and crowds at the "quiet" level.
About 13h 11m on August 15: the sun rises around 7:21 AM and sets around 8:32 PM local park time (CDT). Computed from the park's own coordinates, so it is the light you actually get at the trailhead, not the nearest city's.
South Rim Trail takes about 5h of walking, so on August 15 you would need to leave the trailhead by about 3:31 PM to finish before dark — the sun sets around 8:32 PM local park time (CDT). Walking times are estimated from each trail's measured distance and elevation gain, so treat them as a planning figure and add your own margin for photos, rest and crowds.
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