Weather on October 20 at Gateway Arch
Gateway Arch National Park
Based on 52 years of data from St. Louis, MO
Planning Your Visit
October 20th in Gateway Arch National Park (via St. Louis, MO) typically brings mild fall weather, with average highs around 67°F and lows near 43°F. Over 52 years of records, the warmest October 20th was in 1979 (70°F average), while the coldest was 1972 (35°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 29% of October 20th dates historically, with the wettest October 20th recording 1.52" of rain. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in Gateway Arch? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 74°F | 38°F | 0" | 0" |
| 2024 | 77°F | 36°F | 0" | 0" |
| 2023 | 73°F | 44°F | 0" | 0" |
| 2022 | 73°F | 26°F | 0" | 0" |
| 2021 | 80°F | 46°F | 0" | 0" |
| 2020 | 60°F | 46°F | 1.27" | 0" |
| 2019 | 67°F | 55°F | 0" | 0" |
| 2018 | 67°F | 37°F | 0" | 0" |
| 2017 | 65°F | 59°F | 0" | 0" |
| 2016 | 64°F | 50°F | 1.52" | 0" |
| 2015 | 77°F | 54°F | 0" | 0" |
| 2014 | 69°F | 55°F | 0" | 0" |
| 2013 | 65°F | 44°F | 0" | 0" |
| 2012 | 54°F | 47°F | 0" | 0" |
| 2011 | 52°F | 41°F | 0.18" | -- |
| 2010 | 67°F | 39°F | 0" | 0" |
| 2009 | 72°F | 44°F | 0" | 0" |
| 2008 | 67°F | 40°F | 0" | 0" |
| 2007 | 69°F | 46°F | 0" | 0" |
| 2006 | 66°F | 32°F | 0" | 0" |
| 2005 | 79°F | 53°F | 0.03" | 0" |
| 2004 | 53°F | 51°F | 0.03" | 0" |
| 2003 | 83°F | 57°F | 0" | 0" |
| 2002 | 55°F | 39°F | 0.03" | 0" |
| 2001 | 67°F | 42°F | 0" | 0" |
| 2000 | 76°F | 44°F | 0" | 0" |
| 1999 | 64°F | 36°F | 0" | 0" |
| 1998 | 66°F | 42°F | 0" | 0" |
| 1997 | 70°F | 39°F | 0" | 0" |
| 1996 | 61°F | 34°F | 0" | 0" |
| 1995 | 80°F | 43°F | 0.71" | 0" |
| 1994 | 75°F | 46°F | 0" | 0" |
| 1993 | 62°F | 58°F | 1.35" | 0" |
| 1992 | 70°F | 40°F | 1.02" | 0" |
| 1991 | 58°F | 34°F | 0" | 0" |
| 1990 | 72°F | 46°F | 0" | 0" |
| 1989 | 56°F | 37°F | 0" | 0" |
| 1988 | 60°F | 45°F | 0.2" | 0" |
| 1987 | 58°F | 40°F | 0.38" | 0" |
| 1986 | 78°F | 48°F | 0" | 0" |
| 1985 | 73°F | 57°F | 0.08" | 0" |
| 1982 | 75°F | 23°F | 1.02" | 0" |
| 1980 | -- | 40°F | 0" | 0" |
| 1979 | 78°F | 63°F | 0.03" | 0" |
| 1978 | 77°F | 31°F | 0" | 0" |
| 1977 | 64°F | 33°F | 0" | 0" |
| 1976 | 43°F | 40°F | 0.58" | 0" |
| 1975 | 62°F | 38°F | 0" | 0" |
| 1974 | 64°F | 39°F | 0" | 0" |
| 1973 | 74°F | 45°F | 0" | 0" |
| 1972 | 45°F | 25°F | 0" | 0" |
| 1971 | 76°F | 50°F | 0" | 0" |