Weather on September 17 at Rocky Mountain
Rocky Mountain National Park
Based on 53 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 17th in Rocky Mountain National Park (via Estes Park, CO) typically brings mild fall weather, with average highs around 69°F and lows near 40°F — a 29°F daily swing. Over 53 years of records, the warmest September 17th was in 2018 (68°F average), while the coldest was 1971 (30°F) — a 38°F range across recorded history. Rain or other precipitation has occurred on about 23% of September 17th dates historically, with the wettest September 17th recording 3.45" 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 17th in Rocky Mountain? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 70°F | 32°F | 0.46" | -- |
| 2024 | 76°F | 42°F | 0" | 0" |
| 2023 | 69°F | 32°F | 0" | 0" |
| 2022 | 70°F | 43°F | 0.03" | 0" |
| 2021 | 66°F | 35°F | -- | -- |
| 2020 | 69°F | 39°F | 0" | 0" |
| 2019 | 75°F | 53°F | 0" | 0" |
| 2018 | 84°F | 52°F | 0" | 0" |
| 2017 | 61°F | 33°F | 0.05" | 0" |
| 2016 | 59°F | 33°F | 0" | 0" |
| 2015 | 70°F | 50°F | 0" | 0" |
| 2014 | 77°F | 42°F | 0" | 0" |
| 2013 | 67°F | 45°F | 0" | 0" |
| 2012 | 74°F | 43°F | 0.05" | 0" |
| 2011 | 65°F | 47°F | 0" | 0" |
| 2010 | 76°F | 38°F | 0" | 0" |
| 2009 | 66°F | 41°F | 0" | 0" |
| 2008 | 72°F | 36°F | 0" | 0" |
| 2007 | 73°F | 47°F | 0.58" | 0" |
| 2006 | 55°F | 33°F | 0.43" | 0" |
| 2005 | 70°F | 45°F | 0" | 0" |
| 2004 | 73°F | 42°F | 0" | 0" |
| 2003 | 72°F | 50°F | 0" | 0" |
| 2002 | 75°F | 39°F | 0" | 0" |
| 2001 | 69°F | 39°F | 0" | 0" |
| 2000 | 82°F | 43°F | 0" | 0" |
| 1999 | 63°F | 30°F | 0" | 0" |
| 1998 | 69°F | 38°F | 0" | 0" |
| 1997 | 63°F | 36°F | 0" | 0" |
| 1996 | 64°F | 36°F | 0.13" | 0" |
| 1995 | 67°F | 40°F | 0" | 0" |
| 1994 | 67°F | 32°F | 0" | 0" |
| 1993 | 63°F | 42°F | 0.53" | 0" |
| 1992 | 70°F | 44°F | 0.05" | 0" |
| 1991 | 67°F | 34°F | 0" | 0" |
| 1990 | 60°F | 43°F | 0.36" | 0" |
| 1989 | 77°F | 37°F | 0" | 0" |
| 1988 | 75°F | 47°F | 0" | 0" |
| 1986 | 71°F | 36°F | 0" | 0" |
| 1984 | 71°F | 35°F | 0" | 0" |
| 1983 | 75°F | 50°F | 0" | 0" |
| 1982 | 70°F | 44°F | 0.08" | 0" |
| 1981 | 65°F | 28°F | 0" | 0" |
| 1980 | 73°F | 52°F | 0" | 0" |
| 1979 | 74°F | 30°F | 0" | 0" |
| 1978 | 75°F | 48°F | 0" | 0" |
| 1977 | 69°F | 34°F | 0" | 0" |
| 1976 | 75°F | 40°F | 0" | 0" |
| 1975 | 72°F | 48°F | 0" | 0" |
| 1974 | 65°F | 30°F | 0" | 0" |
| 1973 | 68°F | 37°F | 0" | 0" |
| 1972 | 73°F | 49°F | 0" | 0" |
| 1971 | 35°F | 24°F | 3.45" | -- |