Weather on October 21 at Great Sand Dunes
Great Sand Dunes National Park and Preserve
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
October 21st in Great Sand Dunes National Park (via Alamosa, CO) typically brings mild fall weather, with average highs around 61°F and lows near 22°F — a 39°F daily swing. Over 55 years of records, the warmest October 21st was in 2010 (55°F average), while the coldest was 1996 (15°F) — a 40°F range across recorded history. Precipitation has occurred on 16% of recorded October 21st dates, with snow falling 5% of the time (heaviest snowfall: 3.5"). The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Great Sand Dunes? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 72°F | 27°F | 0" | 0" |
| 2024 | 53°F | 28°F | 0.69" | 0" |
| 2023 | 77°F | 25°F | 0" | 0" |
| 2022 | 69°F | 23°F | 0" | 0" |
| 2021 | 61°F | 17°F | 0" | 0" |
| 2020 | 74°F | 25°F | 0" | 0" |
| 2019 | 50°F | 13°F | 0" | 0" |
| 2018 | 63°F | 20°F | 0" | 0" |
| 2017 | 66°F | 36°F | 0" | 0" |
| 2016 | 62°F | 17°F | 0" | 0" |
| 2015 | 63°F | 32°F | 0.05" | 0" |
| 2014 | 69°F | 31°F | 0" | 0" |
| 2013 | 59°F | 22°F | 0" | 0" |
| 2012 | 73°F | 22°F | 0" | -- |
| 2011 | 67°F | 19°F | 0" | -- |
| 2010 | 69°F | 41°F | 0.61" | 0" |
| 2009 | 66°F | 30°F | 1.07" | 1.3" |
| 2008 | 67°F | 18°F | 0" | 0" |
| 2007 | 69°F | 23°F | 0" | 0" |
| 2006 | 57°F | 19°F | 0" | 0" |
| 2005 | 63°F | 25°F | 0" | 0" |
| 2004 | 61°F | 33°F | 0.13" | 0" |
| 2003 | 76°F | 21°F | 0" | 0" |
| 2002 | 60°F | 26°F | 0" | 0" |
| 2001 | 63°F | 21°F | 0" | 0" |
| 2000 | 62°F | 21°F | 0" | 0" |
| 1999 | 66°F | 15°F | 0" | 0" |
| 1998 | 49°F | 29°F | 0" | 0" |
| 1997 | 60°F | 21°F | 0" | 0" |
| 1996 | 26°F | 3°F | 0.38" | 3.5" |
| 1995 | 67°F | 14°F | 0" | 0" |
| 1994 | 56°F | 20°F | 0" | 0" |
| 1993 | 61°F | 14°F | 0" | 0" |
| 1992 | 65°F | 27°F | 0" | 0" |
| 1991 | 68°F | 30°F | 0" | 0" |
| 1990 | 45°F | 19°F | 0" | 0" |
| 1989 | 63°F | 16°F | 0" | 0" |
| 1988 | 71°F | 21°F | 0" | 0" |
| 1987 | 64°F | 9°F | 0" | 0" |
| 1986 | 47°F | 28°F | 0" | 0" |
| 1985 | 61°F | 24°F | 0" | 0" |
| 1984 | 41°F | 16°F | 0" | 0" |
| 1983 | 65°F | 17°F | 0" | 0" |
| 1982 | 60°F | 16°F | 0" | 0" |
| 1981 | 58°F | 17°F | 0" | 0" |
| 1980 | 59°F | 12°F | 0" | 0" |
| 1979 | 49°F | 20°F | 0.43" | 0.9" |
| 1978 | 58°F | 41°F | 0.69" | 0" |
| 1977 | 60°F | 30°F | 0" | 0" |
| 1976 | 56°F | 10°F | 0" | 0" |
| 1975 | 69°F | 25°F | 0" | 0" |
| 1974 | 60°F | 31°F | 0.05" | 0" |
| 1973 | 67°F | 22°F | 0" | 0" |
| 1972 | 51°F | 24°F | 0" | 0" |
| 1971 | 60°F | 17°F | 0" | 0" |