September is an excellent month at Great Sand Dunes — it ranks 2nd of the twelve here. Expect about 47% fewer visitors than June, the park's peak — 50,483 visits on average. Days run around 72°F by afternoon and 44°F at night, with 12.4 hours of daylight.
September against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| September (this page) | Excellent | 50,483 | −47% | 72°F | 44°F | 0" | 12.4 h |
| April (best) | Excellent | 26,517 | −72% | 56°F | 29°F | 7.9" | 13.1 h |
| June (peak crowds) | Good | 94,559 | peak | 77°F | 48°F | 0" | 14.8 h |
Weather figures are for the visitor center area (about 8,200 ft) — the Great Sand Dunes NP & Preserve station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is September a good time to visit Great Sand Dunes?
Yes — it is one of the best months of the year here. September ranks 2 of 12 at Great Sand Dunes on crowds, weather, daylight, and access together.
How crowded is Great Sand Dunes in September?
About 50,483 recreation visits on average — 47% below June, the park's peak.
How warm is Great Sand Dunes in September?
Average highs around 72°F and lows around 44°F at the Great Sand Dunes NP & Preserve station.
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