Weather on September 17 at Yosemite
Yosemite National Park
Based on 42 years of data from Mariposa, CA
Elevation Note: Yosemite sits at 4,000 ft. Expect temperatures 14°F cooler than the data shown below, which comes from Mariposa, CA at a lower elevation.
Planning Your Visit
September 17th in Yosemite National Park (via Mariposa, CA) typically brings warm fall weather, with average highs around 85°F and lows near 55°F — a 30°F daily swing. Over 42 years of records, the warmest September 17th was in 1971 (81°F average), while the coldest was 1993 (56°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 Yosemite? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 94°F | 65°F | -- | -- |
| 2024 | 72°F | 47°F | -- | -- |
| 2023 | 84°F | 59°F | -- | -- |
| 2022 | 79°F | 53°F | -- | -- |
| 2021 | 86°F | 58°F | -- | -- |
| 2020 | 84°F | 59°F | -- | -- |
| 2019 | 77°F | 47°F | -- | -- |
| 2018 | 81°F | 51°F | -- | -- |
| 2017 | 83°F | 55°F | -- | -- |
| 2016 | 92°F | 58°F | -- | -- |
| 2015 | 76°F | 47°F | -- | -- |
| 2014 | 93°F | 63°F | -- | -- |
| 2013 | 78°F | 55°F | -- | -- |
| 2012 | 90°F | 61°F | -- | -- |
| 2011 | 83°F | 53°F | -- | -- |
| 2010 | 86°F | 54°F | -- | -- |
| 2009 | 90°F | 58°F | -- | -- |
| 2008 | 87°F | 60°F | -- | -- |
| 2007 | 78°F | 50°F | -- | -- |
| 2006 | 82°F | 47°F | -- | -- |
| 2005 | 78°F | 48°F | -- | -- |
| 2004 | 90°F | 59°F | -- | -- |
| 2003 | 84°F | 49°F | -- | -- |
| 2002 | 84°F | 54°F | -- | -- |
| 2001 | 89°F | 55°F | -- | -- |
| 2000 | 96°F | 58°F | -- | -- |
| 1999 | 91°F | 61°F | -- | -- |
| 1998 | 87°F | 55°F | -- | -- |
| 1997 | 81°F | 52°F | -- | -- |
| 1996 | 77°F | 47°F | -- | -- |
| 1995 | 84°F | 56°F | -- | -- |
| 1994 | 89°F | 68°F | -- | -- |
| 1993 | 68°F | 45°F | -- | -- |
| 1992 | 88°F | 58°F | -- | -- |
| 1991 | 93°F | 64°F | -- | -- |
| 1990 | 76°F | 50°F | -- | -- |
| 1976 | 72°F | 49°F | 0" | 0" |
| 1975 | 91°F | 65°F | 0" | 0" |
| 1974 | 92°F | 57°F | 0" | 0" |
| 1973 | 84°F | 50°F | 0" | 0" |
| 1972 | 90°F | 54°F | 0" | 0" |
| 1971 | 102°F | 59°F | 0" | 0" |