Weather on September 23 at Gateway Arch
Gateway Arch National Park
Based on 52 years of data from St. Louis, MO
Planning Your Visit
September 23rd in Gateway Arch National Park (via St. Louis, MO) typically brings pleasant fall weather, with average highs around 77°F and lows near 53°F. Over 52 years of records, the warmest September 23rd was in 2005 (81°F average), while the coldest was 1974 (47°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 23rd dates historically, with the wettest September 23rd recording 8" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for September 23rd in Gateway Arch? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 78°F | 64°F | 2.36" | 0" |
| 2024 | 76°F | 66°F | 2.54" | 0" |
| 2023 | 88°F | 60°F | 0" | 0" |
| 2022 | 63°F | 51°F | 0.08" | 0" |
| 2021 | 72°F | 44°F | 0" | 0" |
| 2020 | 78°F | 55°F | 0" | 0" |
| 2019 | 80°F | 55°F | 0" | 0" |
| 2018 | 81°F | 55°F | 0" | 0" |
| 2017 | 95°F | 65°F | 0" | 0" |
| 2016 | 90°F | 67°F | 0" | 0" |
| 2015 | 82°F | 59°F | 0" | 0" |
| 2014 | 74°F | 52°F | 0" | 0" |
| 2013 | 76°F | 56°F | 0" | 0" |
| 2012 | -- | 42°F | 0" | 0" |
| 2011 | 60°F | 45°F | 0.79" | -- |
| 2010 | 80°F | 67°F | 0" | 0" |
| 2009 | 82°F | 65°F | 0" | 0" |
| 2008 | 87°F | 57°F | 0" | 0" |
| 2007 | 85°F | 63°F | 0" | 0" |
| 2006 | 76°F | 64°F | 0.56" | 0" |
| 2005 | 94°F | 69°F | 0" | 0" |
| 2004 | 84°F | 54°F | 0" | 0" |
| 2003 | 78°F | 52°F | 0" | 0" |
| 2002 | 70°F | 44°F | 0" | 0" |
| 2001 | 77°F | 57°F | 0" | 0" |
| 2000 | 85°F | 58°F | 0" | 0" |
| 1999 | 72°F | 47°F | 0" | 0" |
| 1998 | 72°F | 54°F | 0" | 0" |
| 1997 | 73°F | 58°F | 0.18" | 0" |
| 1996 | 83°F | 55°F | 0" | 0" |
| 1995 | 61°F | 33°F | 0" | 0" |
| 1994 | 67°F | 49°F | 0.33" | 0" |
| 1993 | 74°F | 60°F | 8" | 0" |
| 1992 | 67°F | 44°F | 0" | 0" |
| 1991 | 68°F | 49°F | 0.51" | 0" |
| 1990 | 73°F | 38°F | 0" | 0" |
| 1989 | 74°F | 32°F | 0" | 0" |
| 1988 | 87°F | 57°F | 0.43" | 0" |
| 1987 | 80°F | 58°F | 0" | 0" |
| 1985 | 83°F | 36°F | 0.08" | 0" |
| 1982 | 70°F | 42°F | 0" | 0" |
| 1981 | 74°F | 48°F | 0" | 0" |
| 1980 | 91°F | 55°F | 2.79" | 0" |
| 1979 | 75°F | 39°F | 0" | 0" |
| 1978 | 71°F | 46°F | 0" | 0" |
| 1977 | 85°F | 62°F | 0" | 0" |
| 1976 | 82°F | 50°F | 0" | 0" |
| 1975 | 68°F | 41°F | 0" | 0" |
| 1974 | 61°F | 33°F | 0" | 0" |
| 1973 | 82°F | 63°F | 0.03" | 0" |
| 1972 | 70°F | 59°F | 0.89" | 0" |
| 1971 | 73°F | -- | 0" | 0" |