Weather on September 17 at Great Sand Dunes

Great Sand Dunes National Park and Preserve

CORocky Mountain8,200 ft elevation
Avg High74°F
Avg Low37°F
Warmest201463°F
Coldest197139°F

Based on 55 years of data from Alamosa, CO

Elevation Note: Great Sand Dunes sits at 8,200 ft. Expect temperatures 29°F cooler than the data shown below, which comes from Alamosa, CO at a lower elevation.

Planning Your Visit

September 17th in Great Sand Dunes National Park (via Alamosa, CO) typically brings pleasant fall weather, with average highs around 74°F and lows near 37°F — a 37°F daily swing. Over 55 years of records, the warmest September 17th was in 2014 (63°F average), while the coldest was 1971 (39°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 18% of September 17th dates historically. Temperatures on this date have remained relatively stable over the past several decades.

Temperatures on this date have remained relatively stable over the past several decades.

Planning for September 17th in Great Sand Dunes? Great weather for outdoor activities.

Year by Year History

YearHighLowPrecipSnow
202577°F36°F0"0"
202460°F40°F0.41"0"
202368°F33°F0"0"
202276°F35°F0"0"
202182°F33°F0"0"
202076°F35°F0"0"
201971°F48°F0"0"
201884°F43°F0"0"
201771°F36°F0"0"
201676°F32°F0"0"
201579°F38°F0"0"
201480°F46°F0"0"
201370°F44°F0"0"
201279°F33°F0"0"
201167°F37°F0.25"--
201081°F35°F0"0"
200975°F41°F0.05"0"
200874°F28°F0"0"
200781°F39°F0.03"0"
200664°F21°F0"0"
200576°F29°F--0"
200482°F30°F0"0"
200375°F47°F0"0"
200274°F43°F0"0"
200173°F40°F0.03"0"
200082°F41°F0"0"
199964°F40°F0.13"0"
199877°F37°F0"0"
199777°F39°F0"0"
199665°F39°F0.03"0"
199575°F34°F0"0"
199468°F30°F0"0"
199370°F36°F0"0"
199276°F36°F0"0"
199176°F28°F0"0"
199067°F41°F0.28"0"
198980°F31°F0"0"
198877°F32°F0"0"
198773°F37°F0"0"
198674°F29°F0"0"
198575°F41°F0"0"
198474°F41°F0"0"
198381°F36°F0"0"
198271°F43°F0"0"
198170°F38°F0"0"
198077°F30°F0"0"
197975°F33°F0"0"
197867°F45°F0.46"0"
197771°F42°F0"0"
197676°F38°F0"0"
197578°F40°F0"0"
197464°F39°F0"0"
197377°F32°F0"0"
197279°F33°F0"0"
197149°F29°F0.41"0"

September 17 at Nearby Parks

Holiday Weather at Great Sand Dunes

Official NPS WebsiteVisit nps.gov/grsa for park information, alerts, and reservations

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