Weather on May 21 at Gateway Arch
Gateway Arch National Park
MOMidwest450 ft elevation
Avg High78°F
Avg Low57°F
Warmest198782°F
Coldest200253°F
Based on 54 years of data from St. Louis, MO
Planning Your Visit
May 21st in Gateway Arch National Park (via St. Louis, MO) typically brings pleasant spring weather, with average highs around 78°F and lows near 57°F. Over 54 years of records, the warmest May 21st was in 1987 (82°F average), while the coldest was 2002 (53°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 22% of May 21st dates historically, with the wettest May 21st recording 4.98" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Gateway Arch? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 69°F | 53°F | 0" | 0" |
| 2025 | 73°F | 57°F | 0" | 0" |
| 2024 | 90°F | 68°F | 1.14" | 0" |
| 2023 | 79°F | 47°F | 0" | 0" |
| 2022 | 80°F | 57°F | 4.6" | 0" |
| 2021 | 86°F | 66°F | 0" | 0" |
| 2020 | 67°F | 56°F | 0.1" | 0" |
| 2019 | 73°F | 49°F | 4.98" | 0" |
| 2018 | 80°F | 66°F | -- | 0" |
| 2017 | -- | 60°F | -- | -- |
| 2016 | 72°F | 53°F | 0" | 0" |
| 2015 | 65°F | 47°F | 0" | 0" |
| 2014 | 88°F | 69°F | 0" | 0" |
| 2013 | 82°F | 63°F | 3.4" | 0" |
| 2012 | 90°F | 59°F | 0.15" | -- |
| 2011 | 81°F | 65°F | 0.1" | 0" |
| 2010 | 65°F | 57°F | 0.74" | 0" |
| 2009 | 81°F | 53°F | 0" | 0" |
| 2008 | 67°F | 46°F | 0" | 0" |
| 2007 | 82°F | 52°F | 0" | 0" |
| 2006 | 72°F | 53°F | 0" | 0" |
| 2005 | 67°F | 52°F | 0" | 0" |
| 2004 | 87°F | 71°F | 0" | 0" |
| 2003 | 70°F | 53°F | 0" | 0" |
| 2002 | 64°F | 42°F | 0" | 0" |
| 2001 | 78°F | 59°F | 1.12" | 0" |
| 2000 | 64°F | 45°F | 0" | 0" |
| 1999 | 78°F | 58°F | 0" | 0" |
| 1998 | 85°F | 71°F | 0" | 0" |
| 1997 | 69°F | 46°F | 0" | 0" |
| 1996 | 88°F | 59°F | 0.15" | 0" |
| 1995 | 76°F | 58°F | 2.03" | 0" |
| 1994 | 80°F | 54°F | 0" | 0" |
| 1993 | 71°F | 41°F | 0" | 0" |
| 1992 | 81°F | 66°F | 0" | 0" |
| 1991 | 82°F | 67°F | 0" | 0" |
| 1990 | 72°F | 52°F | 0" | 0" |
| 1989 | 81°F | 54°F | 0" | 0" |
| 1988 | 89°F | 60°F | 0" | 0" |
| 1987 | 93°F | 71°F | 0" | 0" |
| 1986 | 72°F | 51°F | 0" | 0" |
| 1985 | 77°F | 58°F | 0.05" | 0" |
| 1984 | 84°F | 65°F | 0" | 0" |
| 1981 | 72°F | 45°F | 0" | 0" |
| 1980 | 77°F | 57°F | -- | -- |
| 1979 | 73°F | 55°F | 0" | 0" |
| 1978 | 81°F | 55°F | 0" | 0" |
| 1977 | 89°F | 60°F | 0" | 0" |
| 1976 | 83°F | 56°F | 0" | 0" |
| 1975 | 89°F | 61°F | 0" | 0" |
| 1974 | 90°F | 68°F | 0" | 0" |
| 1973 | 77°F | 55°F | 0" | 0" |
| 1972 | 92°F | 68°F | 0" | 0" |
| 1971 | 76°F | 46°F | 0" | 0" |
May 21 at Nearby Parks
Holiday Weather at Gateway Arch
Official NPS WebsiteVisit nps.gov/jeff for park information, alerts, and reservations
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