Weather on October 21 at Gateway Arch
Gateway Arch National Park
Based on 52 years of data from St. Louis, MO
Planning Your Visit
October 21st in Gateway Arch National Park (via St. Louis, MO) typically brings mild fall weather, with average highs around 69°F and lows near 44°F — a 25°F daily swing. Over 52 years of records, the warmest October 21st was in 1979 (76°F average), while the coldest was 1976 (39°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 17% of October 21st dates historically, with the wettest October 21st recording 1.47" 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 October 21st in Gateway Arch? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 67°F | 48°F | 0" | 0" |
| 2024 | 79°F | 40°F | 0" | 0" |
| 2023 | 80°F | 41°F | 0" | 0" |
| 2022 | 82°F | 42°F | 0" | 0" |
| 2021 | 66°F | 50°F | 0" | 0" |
| 2020 | 59°F | 52°F | 0.41" | 0" |
| 2019 | 69°F | 52°F | 0.58" | 0" |
| 2018 | 56°F | 25°F | 0" | 0" |
| 2017 | 76°F | 63°F | -- | 0" |
| 2016 | 63°F | 42°F | 0" | 0" |
| 2015 | 80°F | 58°F | 0.05" | 0" |
| 2014 | 74°F | 48°F | 0" | 0" |
| 2013 | 72°F | 48°F | 0" | 0" |
| 2012 | 66°F | 49°F | 0" | 0" |
| 2011 | 56°F | 37°F | 0" | -- |
| 2010 | 74°F | 41°F | 0" | 0" |
| 2009 | 75°F | 46°F | 0" | 0" |
| 2008 | 72°F | 42°F | 0" | 0" |
| 2007 | 82°F | 49°F | 0" | 0" |
| 2006 | 65°F | 35°F | 0" | 0" |
| 2005 | 67°F | 50°F | 1.19" | 0" |
| 2004 | 58°F | 51°F | 0" | 0" |
| 2003 | 89°F | 60°F | 0" | 0" |
| 2002 | 57°F | 35°F | 0" | 0" |
| 2001 | 75°F | 43°F | 0" | 0" |
| 2000 | 76°F | 46°F | 0" | 0" |
| 1999 | 58°F | 37°F | 0" | 0" |
| 1998 | 65°F | 46°F | 0" | 0" |
| 1997 | 59°F | 46°F | 0" | 0" |
| 1996 | 67°F | 51°F | 1.47" | 0" |
| 1995 | 54°F | 39°F | 0" | 0" |
| 1994 | 76°F | 45°F | 0" | 0" |
| 1993 | 62°F | 43°F | 0" | 0" |
| 1992 | 76°F | 47°F | 0" | 0" |
| 1991 | 72°F | 50°F | 0" | 0" |
| 1990 | 69°F | 37°F | 0" | 0" |
| 1989 | 73°F | 35°F | 0" | 0" |
| 1988 | 67°F | 43°F | 0" | 0" |
| 1987 | 60°F | 27°F | 0.43" | 0" |
| 1986 | 80°F | 47°F | 0" | 0" |
| 1985 | 67°F | 50°F | 0" | 0" |
| 1982 | 55°F | 27°F | 0.03" | 0" |
| 1980 | 74°F | 42°F | 0" | 0" |
| 1979 | 80°F | 71°F | 0" | 0" |
| 1978 | 78°F | 44°F | 0" | 0" |
| 1977 | 70°F | 39°F | 0" | 0" |
| 1976 | 48°F | 31°F | 0.03" | 0" |
| 1975 | 82°F | 44°F | 0" | 0" |
| 1974 | 55°F | 26°F | 0" | 0" |
| 1973 | 68°F | 41°F | 0" | 0" |
| 1972 | 55°F | 37°F | 0" | 0" |
| 1971 | 83°F | 50°F | 1.4" | 0" |