Weather on May 20 at Gateway Arch
Gateway Arch National Park
Based on 53 years of data from St. Louis, MO
Planning Your Visit
May 20th in Gateway Arch National Park (via St. Louis, MO) typically brings pleasant spring weather, with average highs around 79°F and lows near 57°F. Over 53 years of records, the warmest May 20th was in 1998 (81°F average), while the coldest was 1981 (51°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 30% of May 20th dates historically, with the wettest May 20th recording 3.15" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for May 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 | 81°F | 64°F | 0.08" | 0" |
| 2024 | 87°F | 68°F | 0" | 0" |
| 2023 | 72°F | 52°F | 0" | 0" |
| 2022 | 87°F | 64°F | 0" | 0" |
| 2021 | 87°F | 66°F | 0" | 0" |
| 2020 | 70°F | 57°F | 0" | 0" |
| 2019 | 71°F | 53°F | 0" | 0" |
| 2018 | 82°F | 66°F | 2.54" | 0" |
| 2017 | -- | 62°F | 3.15" | 0" |
| 2016 | 72°F | 58°F | 0.03" | 0" |
| 2015 | 64°F | 52°F | 0" | 0" |
| 2014 | 81°F | 60°F | 0" | 0" |
| 2013 | 91°F | 63°F | 0.43" | 0" |
| 2012 | 86°F | 63°F | 0" | -- |
| 2011 | 68°F | 60°F | 0.28" | 0" |
| 2010 | 70°F | 57°F | 2.08" | 0" |
| 2009 | 78°F | 49°F | 0" | 0" |
| 2008 | 77°F | 48°F | 0" | 0" |
| 2007 | 77°F | 52°F | 0" | 0" |
| 2006 | 83°F | 57°F | 0" | 0" |
| 2005 | 87°F | 61°F | 2.03" | 0" |
| 2004 | 81°F | 65°F | 2.13" | 0" |
| 2003 | 82°F | 55°F | 0.3" | 0" |
| 2002 | 66°F | 42°F | 0" | 0" |
| 2001 | 79°F | 64°F | 0" | 0" |
| 2000 | 61°F | 48°F | 0" | 0" |
| 1999 | 77°F | 52°F | 0" | 0" |
| 1998 | 90°F | 72°F | 0" | 0" |
| 1997 | 72°F | 46°F | 0" | 0" |
| 1996 | 91°F | 69°F | 0" | 0" |
| 1995 | 77°F | 51°F | 0" | 0" |
| 1994 | 78°F | 48°F | 0" | 0" |
| 1993 | 65°F | 48°F | 0" | 0" |
| 1992 | 82°F | 60°F | 0.76" | 0" |
| 1991 | 80°F | 67°F | 0" | 0" |
| 1990 | 76°F | 56°F | 0.66" | 0" |
| 1989 | 83°F | 56°F | 0" | 0" |
| 1988 | 88°F | 55°F | 0" | 0" |
| 1987 | 94°F | 66°F | 0" | 0" |
| 1986 | 68°F | 41°F | 0" | 0" |
| 1985 | 84°F | 60°F | 0" | 0" |
| 1984 | 80°F | 58°F | 1.57" | 0" |
| 1981 | 61°F | 41°F | 0" | 0" |
| 1980 | 75°F | 54°F | -- | -- |
| 1979 | 81°F | 61°F | 0.15" | 0" |
| 1978 | 81°F | 63°F | 0.3" | 0" |
| 1977 | 90°F | 60°F | 0" | 0" |
| 1976 | 78°F | 51°F | 0" | 0" |
| 1975 | 91°F | 69°F | 0.05" | 0" |
| 1974 | 87°F | 64°F | 0" | 0" |
| 1973 | 81°F | 54°F | 0" | 0" |
| 1972 | 89°F | 65°F | 0" | 0" |
| 1971 | 72°F | 49°F | 0" | 0" |