Weather on August 21 at Rocky Mountain
Rocky Mountain National Park
Based on 54 years of data from Estes Park, CO
Elevation Note: Rocky Mountain sits at 8,000 ft. Expect temperatures 28°F cooler than the data shown below, which comes from Estes Park, CO at a lower elevation.
Planning Your Visit
August 21st in Rocky Mountain National Park (via Estes Park, CO) typically brings pleasant summer weather, with average highs around 76°F and lows near 46°F — a 30°F daily swing. Over 54 years of records, the warmest August 21st was in 1987 (72°F average), while the coldest was 2004 (51°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 43% of August 21st dates historically, with the wettest August 21st recording 1.07" of rain. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Rocky Mountain? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 85°F | 46°F | 0" | -- |
| 2024 | 86°F | 46°F | 0" | 0" |
| 2023 | 82°F | 43°F | 0" | 0" |
| 2022 | 70°F | 43°F | -- | -- |
| 2021 | 72°F | 45°F | -- | -- |
| 2020 | 81°F | 49°F | 0" | 0" |
| 2019 | 84°F | 50°F | 0" | 0" |
| 2018 | 74°F | 35°F | 0.13" | 0" |
| 2017 | 79°F | 47°F | 0.13" | 0" |
| 2016 | 67°F | 38°F | 0" | 0" |
| 2015 | 75°F | 41°F | 0" | 0" |
| 2014 | 76°F | 53°F | 0" | 0" |
| 2013 | 85°F | 59°F | 0" | 0" |
| 2012 | 73°F | 43°F | 0" | 0" |
| 2011 | 78°F | 51°F | 0" | 0" |
| 2010 | 77°F | 47°F | 0" | 0" |
| 2009 | 75°F | 42°F | 0" | 0" |
| 2008 | 79°F | 47°F | 0.66" | 0" |
| 2007 | 82°F | 50°F | 0" | 0" |
| 2006 | 76°F | 45°F | 0.13" | 0" |
| 2005 | 76°F | 44°F | 0.15" | 0" |
| 2004 | 59°F | 42°F | 0.41" | 0" |
| 2003 | 85°F | 50°F | 0" | 0" |
| 2002 | 75°F | 58°F | 0.03" | 0" |
| 2001 | 76°F | 55°F | 0.08" | 0" |
| 2000 | 67°F | 46°F | 0" | 0" |
| 1999 | 69°F | 44°F | 0.05" | 0" |
| 1998 | 72°F | 43°F | 0.05" | 0" |
| 1997 | 74°F | 43°F | 0" | 0" |
| 1996 | 77°F | 45°F | 0.15" | 0" |
| 1995 | 78°F | 45°F | 0.03" | 0" |
| 1994 | 75°F | 46°F | 0.58" | 0" |
| 1993 | 74°F | 50°F | 0" | 0" |
| 1992 | 74°F | 44°F | 0.51" | -- |
| 1991 | 77°F | 42°F | 0.1" | 0" |
| 1990 | 75°F | 46°F | 0.13" | 0" |
| 1989 | 74°F | 42°F | 0" | 0" |
| 1988 | 76°F | 39°F | 0" | 0" |
| 1987 | 80°F | 65°F | 0.05" | 0" |
| 1985 | 83°F | 49°F | 0" | 0" |
| 1984 | 71°F | 48°F | 0.3" | 0" |
| 1983 | 78°F | 47°F | 0.03" | 0" |
| 1982 | 78°F | 48°F | 1.07" | 0" |
| 1981 | 81°F | 42°F | 0" | 0" |
| 1980 | 73°F | 35°F | 0" | 0" |
| 1979 | 71°F | 46°F | 0" | 0" |
| 1978 | 81°F | 43°F | 0" | 0" |
| 1977 | 75°F | 50°F | 0" | 0" |
| 1976 | 79°F | 42°F | 0" | 0" |
| 1975 | 77°F | 46°F | 0.36" | 0" |
| 1974 | 77°F | 36°F | 0" | 0" |
| 1973 | 80°F | 45°F | 0.18" | 0" |
| 1972 | 74°F | 41°F | 0.03" | 0" |
| 1971 | 80°F | 51°F | 0" | 0" |