Weather on September 17 at Gateway Arch
Gateway Arch National Park
Based on 54 years of data from St. Louis, MO
Planning Your Visit
September 17th in Gateway Arch National Park (via St. Louis, MO) typically brings warm fall weather, with average highs around 80°F and lows near 58°F. Over 54 years of records, the warmest September 17th was in 2026 (85°F average), while the coldest was 1996 (57°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 26% of September 17th dates historically, with the wettest September 17th recording 1.66" of rain. The last decade has been 9.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 9.0°F warmer on this date compared to 20-30 years ago.
Planning for September 17th in Gateway Arch? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 98°F | 71°F | 0" | -- |
| 2025 | 92°F | 58°F | 0" | 0" |
| 2024 | 90°F | 60°F | 0" | 0" |
| 2023 | 78°F | 52°F | 0" | 0" |
| 2022 | 88°F | 61°F | 0" | 0" |
| 2021 | 89°F | 60°F | 0" | 0" |
| 2020 | 79°F | 55°F | 0" | 0" |
| 2019 | 91°F | 69°F | 0" | 0" |
| 2018 | 93°F | 66°F | 0" | 0" |
| 2017 | 89°F | 69°F | 0.01" | 0" |
| 2016 | 75°F | 68°F | 0.94" | 0" |
| 2015 | 85°F | 68°F | 0" | 0" |
| 2014 | 66°F | 53°F | 0" | 0" |
| 2013 | 74°F | 60°F | 0" | 0" |
| 2012 | 73°F | 64°F | 0.01" | 0" |
| 2011 | 68°F | 53°F | 0" | -- |
| 2010 | 83°F | 52°F | 0" | 0" |
| 2009 | 83°F | 59°F | 0" | 0" |
| 2008 | 70°F | 51°F | 0" | 0" |
| 2007 | 71°F | 56°F | 0" | 0" |
| 2006 | 87°F | 62°F | 0" | 0" |
| 2005 | 67°F | 53°F | 0" | 0" |
| 2004 | 81°F | 58°F | 0" | 0" |
| 2003 | 83°F | 58°F | 0" | 0" |
| 2002 | 79°F | 65°F | 0" | 0" |
| 2001 | 75°F | 53°F | 0" | 0" |
| 2000 | 69°F | 47°F | 0" | 0" |
| 1999 | 72°F | 45°F | 0" | 0" |
| 1998 | 79°F | 69°F | 0.43" | 0" |
| 1997 | 92°F | 69°F | 0.65" | 0" |
| 1996 | 65°F | 50°F | 0.07" | 0" |
| 1995 | 81°F | 62°F | 0" | 0" |
| 1994 | 84°F | 61°F | 0" | 0" |
| 1993 | 71°F | 50°F | 0" | 0" |
| 1992 | 86°F | 61°F | 0" | 0" |
| 1991 | 78°F | 58°F | 0" | 0" |
| 1990 | 73°F | 54°F | 0" | 0" |
| 1989 | 79°F | 51°F | 0" | 0" |
| 1988 | 94°F | 59°F | 0.3" | 0" |
| 1987 | 83°F | 58°F | 1.66" | 0" |
| 1986 | 75°F | 63°F | 0.54" | 0" |
| 1985 | 85°F | 61°F | 0" | 0" |
| 1982 | 77°F | 55°F | 0" | 0" |
| 1981 | 70°F | 48°F | 0" | 0" |
| 1980 | 87°F | 54°F | 1.6" | 0" |
| 1979 | 79°F | 42°F | 0" | 0" |
| 1978 | 83°F | 67°F | 1.06" | 0" |
| 1977 | 80°F | 60°F | 0" | 0" |
| 1976 | 73°F | 43°F | 0" | 0" |
| 1975 | 70°F | 61°F | 0.23" | 0" |
| 1974 | 65°F | 59°F | 0.07" | 0" |
| 1973 | 80°F | 58°F | 0.08" | 0" |
| 1972 | 90°F | 73°F | 0" | 0" |
| 1971 | 68°F | -- | 0" | 0" |