Weather on September 12 at Grand Teton
Grand Teton National Park
Based on 55 years of data from Jackson, WY
Elevation Note: Grand Teton sits at 6,800 ft. Expect temperatures 24°F cooler than the data shown below, which comes from Jackson, WY at a lower elevation.
Planning Your Visit
September 12th in Grand Teton National Park (via Jackson, WY) typically brings mild fall weather, with average highs around 69°F and lows near 34°F — a 35°F daily swing. Over 55 years of records, the warmest September 12th was in 1998 (64°F average), while the coldest was 2014 (34°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 12th dates historically, with the wettest September 12th recording 2.11" 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 12th in Grand Teton? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 68°F | 34°F | 0.08" | 0" |
| 2024 | 79°F | 43°F | 0.1" | 0" |
| 2023 | 71°F | 32°F | 0" | 0" |
| 2022 | 77°F | 28°F | 0" | 0" |
| 2021 | 69°F | 29°F | 0.03" | 0" |
| 2020 | 69°F | 28°F | 0" | 0" |
| 2019 | 50°F | 34°F | 0.76" | 0" |
| 2018 | 74°F | 32°F | 0" | 0" |
| 2017 | 79°F | 37°F | 0" | 0" |
| 2016 | 76°F | 41°F | 0" | 0" |
| 2015 | 78°F | 31°F | 0" | 0" |
| 2014 | 50°F | 17°F | 0" | 0" |
| 2013 | 71°F | 48°F | 0.18" | 0" |
| 2012 | 61°F | 33°F | 0" | -- |
| 2011 | 78°F | 39°F | 0" | 0" |
| 2010 | 70°F | 22°F | 0" | 0" |
| 2009 | 77°F | 28°F | 0" | 0" |
| 2008 | 69°F | 27°F | 0" | 0" |
| 2007 | 78°F | 29°F | 0" | 0" |
| 2006 | 82°F | 30°F | -- | -- |
| 2005 | 56°F | 37°F | -- | -- |
| 2004 | 64°F | 36°F | 0.76" | -- |
| 2003 | 53°F | 28°F | -- | -- |
| 2002 | 73°F | 44°F | -- | -- |
| 2001 | 80°F | 32°F | -- | -- |
| 2000 | 77°F | 32°F | 0" | -- |
| 1999 | 58°F | 27°F | 0" | -- |
| 1998 | 75°F | 54°F | -- | -- |
| 1997 | 64°F | 48°F | 0.48" | 0" |
| 1996 | 78°F | 42°F | 0" | 0" |
| 1995 | 75°F | 29°F | 0" | 0" |
| 1994 | 73°F | 34°F | 0" | 0" |
| 1993 | 79°F | 46°F | 0" | 0" |
| 1992 | 72°F | 49°F | 0" | 0" |
| 1991 | 61°F | 32°F | 0.03" | 0" |
| 1990 | 86°F | 34°F | 0" | 0" |
| 1989 | 61°F | 27°F | 0" | 0" |
| 1988 | 52°F | 18°F | 0" | 0" |
| 1987 | 75°F | 24°F | 0" | 0" |
| 1986 | 72°F | 36°F | 0" | -- |
| 1985 | 58°F | 36°F | 2.11" | 0" |
| 1984 | 68°F | 47°F | 0.03" | 0" |
| 1983 | 78°F | 26°F | 0" | 0" |
| 1982 | 61°F | 32°F | 0" | 0" |
| 1981 | 82°F | 30°F | 0" | 0" |
| 1980 | 60°F | 45°F | 0.03" | 0" |
| 1979 | 69°F | 21°F | 0" | 0" |
| 1978 | 46°F | 37°F | 0.18" | 0" |
| 1977 | 72°F | 25°F | 0" | 0" |
| 1976 | 71°F | 50°F | 0.25" | 0" |
| 1975 | 76°F | 30°F | 0" | 0" |
| 1974 | 53°F | 24°F | 0.23" | 0" |
| 1973 | 72°F | 39°F | 0.25" | 0" |
| 1972 | 64°F | 31°F | 0" | 0" |
| 1971 | 80°F | 29°F | 0" | 0" |