Weather on June 21 at Gateway Arch
Gateway Arch National Park
Based on 53 years of data from St. Louis, MO
Planning Your Visit
June 21st in Gateway Arch National Park (via St. Louis, MO) typically brings warm summer weather, with average highs around 88°F and lows near 67°F. Over 53 years of records, the warmest June 21st was in 2025 (87°F average), while the coldest was 1992 (58°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 25% of June 21st dates historically, with the wettest June 21st recording 6.86" of rain. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for June 21st in Gateway Arch? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 96°F | 77°F | 0" | 0" |
| 2024 | 94°F | 68°F | 0" | 0" |
| 2023 | 89°F | 67°F | 0" | 0" |
| 2022 | 97°F | 65°F | 0" | 0" |
| 2021 | 77°F | 56°F | -- | 0" |
| 2020 | 87°F | 66°F | 6.86" | 0" |
| 2019 | 79°F | 64°F | 2.39" | -- |
| 2018 | 90°F | 76°F | 0" | 0" |
| 2017 | 90°F | 73°F | 0" | 0" |
| 2016 | 95°F | 73°F | 0.03" | 0" |
| 2015 | 88°F | 69°F | 0.81" | 0" |
| 2014 | 93°F | 71°F | 0.86" | 0" |
| 2013 | 91°F | 74°F | 0" | 0" |
| 2012 | 95°F | 75°F | 0" | 0" |
| 2011 | 90°F | 68°F | 0.74" | 0" |
| 2010 | 94°F | 75°F | 0" | 0" |
| 2009 | 91°F | 73°F | 0" | 0" |
| 2008 | 78°F | 62°F | 0" | 0" |
| 2007 | 85°F | 62°F | 0" | 0" |
| 2006 | 92°F | 74°F | 0" | 0" |
| 2005 | 82°F | 60°F | 0" | 0" |
| 2004 | 79°F | 65°F | 0" | 0" |
| 2003 | 80°F | 59°F | 0" | 0" |
| 2002 | 90°F | 68°F | 0" | 0" |
| 2001 | 81°F | 67°F | 0.74" | 0" |
| 2000 | 87°F | 67°F | 2.54" | 0" |
| 1999 | 83°F | 66°F | 0" | 0" |
| 1998 | 78°F | 68°F | 0.71" | 0" |
| 1997 | 89°F | 73°F | 0" | 0" |
| 1996 | 91°F | 72°F | 0" | 0" |
| 1995 | 92°F | 67°F | 0.05" | 0" |
| 1994 | 93°F | 73°F | 0" | 0" |
| 1993 | 87°F | 68°F | 0" | 0" |
| 1992 | 70°F | 47°F | 0" | 0" |
| 1991 | 88°F | 68°F | 0.1" | 0" |
| 1990 | 88°F | 64°F | 0" | 0" |
| 1989 | 90°F | 67°F | 0" | 0" |
| 1988 | 99°F | 72°F | 0" | 0" |
| 1987 | 93°F | 67°F | 0" | 0" |
| 1986 | 94°F | 66°F | 0" | 0" |
| 1985 | 85°F | 63°F | 0" | 0" |
| 1984 | 92°F | 71°F | 0" | 0" |
| 1981 | 86°F | 68°F | 0.69" | 0" |
| 1980 | 85°F | 65°F | 0" | -- |
| 1979 | 94°F | 66°F | 0" | 0" |
| 1978 | 79°F | -- | 0" | 0" |
| 1977 | 89°F | 60°F | 0" | 0" |
| 1976 | 82°F | 51°F | 0" | 0" |
| 1975 | 90°F | 66°F | 0.13" | 0" |
| 1974 | 80°F | 72°F | 0" | 0" |
| 1973 | 85°F | 66°F | 0" | 0" |
| 1972 | 84°F | 57°F | 0" | 0" |
| 1971 | 93°F | 71°F | 0" | 0" |