Weather on April 20 at Gateway Arch
Gateway Arch National Park
Based on 54 years of data from St. Louis, MO
Planning Your Visit
April 20th in Gateway Arch National Park (via St. Louis, MO) typically brings pleasant spring weather, with average highs around 70°F and lows near 48°F. Over 54 years of records, the warmest April 20th was in 2017 (78°F average), while the coldest was 2021 (38°F) — a 40°F range across recorded history. Rain or other precipitation has occurred on about 48% of April 20th dates historically, with the wettest April 20th recording 4.11" of rain. The last decade has been 6.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 6.0°F cooler on this date compared to 20-30 years ago.
Planning for April 20th in Gateway Arch? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 79°F | 55°F | 1.88" | 0" |
| 2024 | 61°F | 43°F | 0" | 0" |
| 2023 | 80°F | 54°F | 0.03" | 0" |
| 2022 | 64°F | 46°F | 0.48" | 0" |
| 2021 | 44°F | 32°F | 0.64" | -- |
| 2020 | 71°F | 36°F | 0" | 0" |
| 2019 | 68°F | 40°F | 0" | 0" |
| 2018 | 63°F | 32°F | 0" | 0" |
| 2017 | 87°F | 69°F | 0" | 0" |
| 2016 | 73°F | 58°F | 0.36" | 0" |
| 2015 | 64°F | 50°F | 1.4" | 0" |
| 2014 | 75°F | 53°F | 0" | 0" |
| 2013 | 52°F | 33°F | 0" | 0" |
| 2012 | 77°F | 55°F | 0.13" | -- |
| 2011 | 88°F | 40°F | 1.24" | 0" |
| 2010 | 64°F | 41°F | 0" | 0" |
| 2009 | 60°F | 46°F | 2.92" | 0" |
| 2008 | 58°F | 47°F | 0.1" | 0" |
| 2007 | 62°F | 39°F | 0" | 0" |
| 2006 | 75°F | 48°F | 0" | 0" |
| 2005 | 80°F | 57°F | 0" | 0" |
| 2004 | 81°F | 62°F | 0.05" | 0" |
| 2003 | 72°F | 56°F | 1.24" | 0" |
| 2002 | 85°F | 58°F | 1.55" | 0" |
| 2001 | 71°F | 50°F | 0" | 0" |
| 2000 | 85°F | 60°F | 0" | 0" |
| 1999 | 71°F | 43°F | 0" | 0" |
| 1998 | 64°F | 43°F | 0" | 0" |
| 1997 | 65°F | 44°F | 0" | 0" |
| 1996 | 79°F | 50°F | 0.76" | 0" |
| 1995 | 67°F | 45°F | 1.5" | 0" |
| 1994 | 74°F | 53°F | 0" | 0" |
| 1993 | 70°F | 44°F | 1.65" | 0" |
| 1992 | 70°F | 59°F | 0.71" | 0" |
| 1991 | 54°F | 39°F | 0" | 0" |
| 1990 | 70°F | 55°F | 0.76" | 0" |
| 1989 | 72°F | 50°F | 0" | 0" |
| 1988 | 79°F | 39°F | 0" | 0" |
| 1987 | 88°F | 56°F | 0" | 0" |
| 1985 | 88°F | 56°F | 0" | 0" |
| 1984 | 59°F | 46°F | 4.11" | 0" |
| 1983 | 50°F | 31°F | 0" | 0" |
| 1982 | 60°F | 43°F | 0.64" | 0" |
| 1981 | 65°F | 46°F | 1.88" | 0" |
| 1980 | 82°F | 53°F | 0" | 0" |
| 1979 | 70°F | 52°F | 0" | 0" |
| 1978 | 50°F | 40°F | 0" | 0" |
| 1977 | 71°F | 60°F | 0.51" | 0" |
| 1976 | 67°F | 57°F | 1.91" | 0" |
| 1975 | 64°F | 38°F | 0.05" | 0" |
| 1974 | 76°F | 53°F | 0" | 0" |
| 1973 | 73°F | 60°F | 0.33" | 0" |
| 1972 | 83°F | 55°F | 2.92" | 0" |
| 1971 | 85°F | 38°F | 0" | 0" |