Weather on April 21 at Gateway Arch
Gateway Arch National Park
Based on 55 years of data from St. Louis, MO
Planning Your Visit
April 21st in Gateway Arch National Park (via St. Louis, MO) typically brings mild spring weather, with average highs around 69°F and lows near 47°F. Over 55 years of records, the warmest April 21st was in 1985 (75°F average), while the coldest was 2021 (42°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 44% of April 21st dates historically, with the wettest April 21st recording 1.3" of rain. The last decade has been 4.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.8°F cooler on this date compared to 20-30 years ago.
Planning for April 21st 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 | 68°F | 50°F | 0" | 0" |
| 2024 | 61°F | 37°F | 0" | 0" |
| 2023 | 67°F | 48°F | 0" | 0" |
| 2022 | 76°F | 53°F | 0.03" | 0" |
| 2021 | 52°F | 31°F | 0" | 0" |
| 2020 | 66°F | 40°F | 0" | 0" |
| 2019 | 80°F | 38°F | 0" | 0" |
| 2018 | 69°F | 36°F | 0" | 0" |
| 2017 | 83°F | 49°F | 0.03" | 0" |
| 2016 | 69°F | 58°F | 0.79" | 0" |
| 2015 | 59°F | 45°F | 0" | 0" |
| 2014 | 81°F | 63°F | 0.1" | 0" |
| 2013 | 56°F | 42°F | 0" | 0" |
| 2012 | 57°F | 42°F | 0.15" | -- |
| 2011 | 56°F | 41°F | 0" | 0" |
| 2010 | 69°F | 41°F | 0" | 0" |
| 2009 | 65°F | 41°F | 0" | 0" |
| 2008 | 71°F | 50°F | 0" | 0" |
| 2007 | 70°F | 44°F | 0" | 0" |
| 2006 | 76°F | 52°F | 0" | 0" |
| 2005 | 82°F | 58°F | 0.61" | 0" |
| 2004 | 81°F | 56°F | 0.38" | 0" |
| 2003 | 66°F | 51°F | 0" | 0" |
| 2002 | 60°F | 51°F | 0.33" | 0" |
| 2001 | 72°F | 64°F | 0.05" | 0" |
| 2000 | 75°F | 42°F | 0" | 0" |
| 1999 | 72°F | 53°F | 1.04" | 0" |
| 1998 | 69°F | 48°F | 0" | 0" |
| 1997 | 60°F | 49°F | 1.14" | 0" |
| 1996 | 72°F | 42°F | 0" | 0" |
| 1995 | 67°F | 48°F | 0" | 0" |
| 1994 | 68°F | 50°F | 0.28" | 0" |
| 1993 | 57°F | 37°F | 0.1" | 0" |
| 1992 | 69°F | 42°F | 0.03" | 0" |
| 1991 | 58°F | 36°F | 0" | 0" |
| 1990 | 73°F | 45°F | 0.94" | 0" |
| 1989 | 80°F | 45°F | 0" | 0" |
| 1988 | 74°F | 45°F | 0" | 0" |
| 1987 | 86°F | 54°F | 0" | 0" |
| 1986 | 57°F | 34°F | 0.28" | 0" |
| 1985 | 85°F | 66°F | 0" | 0" |
| 1984 | 60°F | 48°F | 1.27" | 0" |
| 1983 | 58°F | 37°F | 0" | 0" |
| 1982 | 63°F | 34°F | 0" | 0" |
| 1981 | 55°F | 42°F | 0" | 0" |
| 1980 | 85°F | 56°F | 0" | 0" |
| 1979 | 83°F | 56°F | 0.15" | 0" |
| 1978 | 46°F | 39°F | 0" | 0" |
| 1977 | 79°F | 59°F | 0.86" | 0" |
| 1976 | 76°F | 54°F | 0.51" | 0" |
| 1975 | 65°F | 37°F | 0" | 0" |
| 1974 | 82°F | 58°F | 1.27" | 0" |
| 1973 | 80°F | 65°F | 0.13" | 0" |
| 1972 | 69°F | 54°F | 1.17" | 0" |
| 1971 | 87°F | 52°F | 1.3" | 0" |