August in Grand Canyon National Park is a tough month: highs around 82°F, lows around 53°F. Crowds: peak crowds — #1 busiest of the park's 12 months. Monsoon continues; afternoon storms clear to great sunsets. The editorial best window here is April–May & September–October. You get about 13h 31m of daylight. To finish Bright Angel to Havasupai Gardens (4h 30m) before dark, leave the trailhead by about 2:46 PM.
Month data reviewed · how we check this
| Verdict | Tough Closures, harsh weather or very limited access — plan carefully. |
|---|---|
| Temps °F | 82° high / 53° low |
| Crowds | peak crowds · #1 busiest of the park's 12 months |
| What August is like | Monsoon continues; afternoon storms clear to great sunsets |
| Best window (whole year) | April–May & September–October |
| Peak crowds (whole year) | Jun–Aug |
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 (MST)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 COOL-WEATHER RATE, BECAUSE THIS MONTH AVERAGES 82°F. TRAILS WE HAVE NOT MEASURED ARE LEFT OUT RATHER THAN GUESSED
WHAT AUGUST ASKS OF YOU HEREGrand Canyon National Park in September — Best window, highs around 76°F, crowds: busy (storms fade, crowds thin — the golden weeks).
Our verdict for August is "Tough". Closures, harsh weather or very limited access — plan carefully. Expect highs around 82°F and lows around 53°F, with crowds at the "peak crowds" 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 April–May & September–October, and the peak-crowd months are Jun–Aug. August itself we rate "Tough".
September we rate "Best window" against "Tough" for August, with highs around 76°F and crowds at the "busy" level.
About 13h 31m on August 15: the sun rises around 5:47 AM and sets around 7:17 PM local park time (MST). Computed from the park's own coordinates, so it is the light you actually get at the trailhead, not the nearest city's.
Bright Angel to Havasupai Gardens takes about 4h 30m of walking, so on August 15 you would need to leave the trailhead by about 2:46 PM to finish before dark — the sun sets around 7:17 PM local park time (MST). 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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