Weather on September 11 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
September 11th in Rocky Mountain National Park (via Estes Park, CO) typically brings mild fall weather, with average highs around 69°F and lows near 42°F — a 27°F daily swing. Over 54 years of records, the warmest September 11th was in 2021 (68°F average), while the coldest was 2020 (36°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 37% of September 11th dates historically, with the wettest September 11th recording 2.36" of rain. 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 11th 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 | 80°F | 49°F | 0.08" | -- |
| 2024 | 77°F | 42°F | 0" | 0" |
| 2023 | 56°F | 41°F | 0.99" | 0" |
| 2022 | 67°F | 28°F | 0.03" | 0" |
| 2021 | 83°F | 54°F | -- | -- |
| 2020 | 43°F | 29°F | 0" | 0" |
| 2019 | 70°F | 43°F | 0" | 0" |
| 2018 | 82°F | 43°F | 0" | 0" |
| 2017 | 76°F | 50°F | 0.03" | 0" |
| 2016 | 71°F | 29°F | 0" | 0" |
| 2015 | 78°F | 38°F | 0" | 0" |
| 2014 | 66°F | 43°F | 0" | 0" |
| 2013 | 55°F | 49°F | 1.68" | 0" |
| 2012 | 79°F | 52°F | 0" | 0" |
| 2011 | 67°F | 38°F | 0" | 0" |
| 2010 | 61°F | 42°F | 0" | 0" |
| 2009 | 75°F | 43°F | 0" | 0" |
| 2008 | 68°F | 45°F | 0.03" | 0" |
| 2007 | 56°F | 32°F | 0.05" | 0" |
| 2006 | 62°F | 40°F | 0.86" | 0" |
| 2005 | 74°F | 52°F | 0" | 0" |
| 2004 | 68°F | 50°F | 0.1" | 0" |
| 2003 | 55°F | 35°F | 0" | 0" |
| 2002 | 56°F | 46°F | 0" | 0" |
| 2001 | 74°F | 38°F | 0" | 0" |
| 2000 | 72°F | 41°F | 0" | 0" |
| 1999 | 64°F | 43°F | 0.03" | 0" |
| 1998 | 72°F | 41°F | 0.08" | 0" |
| 1997 | 72°F | 46°F | 0" | 0" |
| 1996 | 75°F | 38°F | 0" | 0" |
| 1995 | 69°F | 38°F | 0" | 0" |
| 1994 | 68°F | 43°F | 0" | 0" |
| 1993 | 78°F | 55°F | 0" | 0" |
| 1992 | 76°F | 35°F | 0" | 0" |
| 1991 | 71°F | 40°F | 0" | 0" |
| 1990 | 77°F | 35°F | 0" | 0" |
| 1989 | 42°F | 35°F | 0" | 0" |
| 1988 | 67°F | 44°F | 0.81" | 0" |
| 1987 | 62°F | 32°F | 0.05" | 0" |
| 1986 | 62°F | 44°F | 0" | 0" |
| 1984 | 80°F | 42°F | 0" | 0" |
| 1983 | 79°F | 39°F | 0" | 0" |
| 1982 | 71°F | 44°F | 1.04" | 0" |
| 1981 | 69°F | 38°F | 0.03" | 0" |
| 1980 | 69°F | 51°F | 0.05" | 0" |
| 1979 | 78°F | 41°F | 0.13" | 0" |
| 1978 | 74°F | 43°F | 0.1" | 0" |
| 1977 | 74°F | 55°F | 0" | 0" |
| 1976 | 76°F | 44°F | 0" | 0" |
| 1975 | 70°F | 41°F | 0.41" | 0" |
| 1974 | 76°F | 43°F | 0" | 0" |
| 1973 | 65°F | 47°F | 2.36" | 0" |
| 1972 | 65°F | 36°F | 0" | 0" |
| 1971 | 80°F | 37°F | 0" | 0" |