Weather on August 20 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
August 20th in Great Sand Dunes National Park (via Alamosa, CO) typically brings warm summer weather, with average highs around 80°F and lows near 46°F — a 34°F daily swing. Over 55 years of records, the warmest August 20th was in 1982 (69°F average), while the coldest was 1979 (56°F) — a 13°F range across recorded history. Rain or other precipitation has occurred on about 29% of August 20th dates historically, with the wettest August 20th recording 2.13" of rain. The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Great Sand Dunes? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 88°F | 46°F | 0" | 0" |
| 2024 | 88°F | 49°F | 0" | 0" |
| 2023 | 88°F | 43°F | 0" | 0" |
| 2022 | 76°F | 46°F | 0" | 0" |
| 2021 | 77°F | 47°F | 0" | 0" |
| 2020 | 93°F | 45°F | 0" | 0" |
| 2019 | 85°F | 45°F | 0" | 0" |
| 2018 | 82°F | 41°F | 0" | 0" |
| 2017 | 84°F | 47°F | 0" | 0" |
| 2016 | 77°F | 42°F | 0" | 0" |
| 2015 | 81°F | 38°F | 0" | 0" |
| 2014 | 82°F | 56°F | 0" | 0" |
| 2013 | 82°F | 44°F | 0" | 0" |
| 2012 | 83°F | 47°F | 0" | -- |
| 2011 | 82°F | 53°F | 0" | -- |
| 2010 | 82°F | 43°F | 0.03" | 0" |
| 2009 | 83°F | 35°F | 0" | 0" |
| 2008 | 79°F | 43°F | 0" | 0" |
| 2007 | 83°F | 44°F | 0" | 0" |
| 2006 | 74°F | 50°F | 0.33" | 0" |
| 2005 | 79°F | 42°F | 0.05" | 0" |
| 2004 | 76°F | 45°F | 0.1" | 0" |
| 2003 | 86°F | 49°F | 0" | 0" |
| 2002 | 81°F | 53°F | 0.2" | 0" |
| 2001 | 84°F | 47°F | 0" | 0" |
| 2000 | 78°F | 42°F | 0.2" | 0" |
| 1999 | 73°F | 53°F | 0.18" | 0" |
| 1998 | 82°F | 46°F | 0" | 0" |
| 1997 | 82°F | 43°F | 0" | 0" |
| 1996 | 80°F | 50°F | 0" | 0" |
| 1995 | 77°F | 47°F | 0" | 0" |
| 1994 | 75°F | 49°F | 0" | 0" |
| 1993 | 73°F | 53°F | 0.08" | 0" |
| 1992 | 85°F | 43°F | 0.13" | 0" |
| 1991 | 83°F | 44°F | 0" | 0" |
| 1990 | 73°F | 51°F | 2.13" | 0" |
| 1989 | 77°F | 38°F | 0" | 0" |
| 1988 | 83°F | 45°F | 0" | 0" |
| 1987 | 87°F | 49°F | 0" | 0" |
| 1986 | 87°F | 45°F | 0.03" | 0" |
| 1985 | 80°F | 43°F | 0" | 0" |
| 1984 | 75°F | 53°F | 0.3" | 0" |
| 1983 | 78°F | 43°F | 0" | 0" |
| 1982 | 83°F | 55°F | 0" | 0" |
| 1981 | 82°F | 44°F | 0" | 0" |
| 1980 | 77°F | 35°F | 0" | 0" |
| 1979 | 71°F | 41°F | 0" | 0" |
| 1978 | 78°F | 45°F | 0" | 0" |
| 1977 | 75°F | 49°F | 0.43" | 0" |
| 1976 | 76°F | 42°F | 0" | 0" |
| 1975 | 75°F | 51°F | 0.58" | 0" |
| 1974 | 79°F | 45°F | 0" | 0" |
| 1973 | 83°F | 49°F | 0" | 0" |
| 1972 | 75°F | 50°F | 0.08" | 0" |
| 1971 | 72°F | 54°F | 0.33" | 0" |