Great Sand Dunes National Park in September
In September, Great Sand Dunes National Park averages a high of 72°F and a low of 44°F, with 1.3 inches of precipitation (rain plus melted snow). About 47,000 people visit, the 5th busiest of 12 (moderate). Days are 12 hours 23 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 72° / 44°F
- Precipitation
- 1.3in
- Snow
- 0in
- Daylight
- 12h 23m
- Visitors
- 47,000
- Crowds
- Moderate
Best months for weather and crowds instead: June (very busy) and October (moderate).
Weather 1991–2020 averages at Great Sand Dunes NP & Preserve, CO, 6 miles from the park's center, 8,183 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Black Canyon of the Gunnison National Park | 72° / 44° | Very busy | Mild, wet |
| Mesa Verde National Park | 76° / 50° | Busy | Mild, wet |
| Rocky Mountain National Park | 68° / 32° | Busy | Mild, wet |
| Arches National Park | 87° / 58° | Very busy | Hot |
| Canyonlands National Park | 84° / 51° | Very busy | Hot |
Closures, reservations and alerts: Great Sand Dunes National Park on nps.gov
All twelve months at Great Sand Dunes · National parks to visit in September