Weather on May 18 at Gateway Arch
Gateway Arch National Park
Based on 53 years of data from St. Louis, MO
Planning Your Visit
May 18th in Gateway Arch National Park (via St. Louis, MO) typically brings pleasant spring weather, with average highs around 76°F and lows near 57°F. Over 53 years of records, the warmest May 18th was in 1996 (80°F average), while the coldest was 2002 (49°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 34% of May 18th dates historically, with the wettest May 18th recording 8.89" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 18th in Gateway Arch? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 80°F | 65°F | 5" | 0" |
| 2025 | 79°F | 57°F | 0" | 0" |
| 2024 | 87°F | 61°F | 0" | 0" |
| 2023 | 83°F | 58°F | 0" | 0" |
| 2022 | 83°F | 63°F | 1.12" | 0" |
| 2021 | 74°F | 62°F | 1.04" | 0" |
| 2020 | 65°F | 57°F | 0" | 0" |
| 2019 | 87°F | 65°F | 0" | 0" |
| 2018 | 82°F | 64°F | -- | 0" |
| 2017 | 81°F | 78°F | 0" | 0" |
| 2016 | 56°F | 48°F | 0.76" | 0" |
| 2015 | 82°F | 67°F | 0" | 0" |
| 2014 | 66°F | 45°F | 0" | 0" |
| 2013 | 79°F | 64°F | 0" | 0" |
| 2012 | 78°F | 52°F | 0" | -- |
| 2011 | 63°F | 51°F | 0" | 0" |
| 2010 | 62°F | 54°F | 0.03" | 0" |
| 2009 | 64°F | 42°F | 0" | 0" |
| 2008 | 81°F | 57°F | 0" | 0" |
| 2007 | 64°F | 41°F | 0" | 0" |
| 2006 | 76°F | 55°F | 0" | 0" |
| 2005 | 74°F | 50°F | 0" | 0" |
| 2004 | 83°F | 65°F | 0" | 0" |
| 2003 | 71°F | 61°F | 0" | 0" |
| 2002 | 59°F | 40°F | 1.52" | 0" |
| 2001 | 86°F | 68°F | 0.41" | 0" |
| 2000 | 84°F | 68°F | 0" | 0" |
| 1999 | 82°F | 59°F | 0.41" | 0" |
| 1998 | 87°F | 56°F | 0" | 0" |
| 1997 | 87°F | 66°F | 0.1" | 0" |
| 1996 | 93°F | 67°F | 0" | 0" |
| 1995 | 71°F | 54°F | 8.89" | 0" |
| 1994 | 74°F | 49°F | 0" | 0" |
| 1993 | 71°F | 55°F | 3.05" | 0" |
| 1992 | 75°F | 63°F | 0.46" | 0" |
| 1991 | 86°F | 62°F | 0" | 0" |
| 1990 | 78°F | 58°F | 0" | 0" |
| 1989 | 79°F | 60°F | 0" | 0" |
| 1988 | 80°F | 51°F | 0" | 0" |
| 1987 | 93°F | 63°F | 0.23" | 0" |
| 1986 | 62°F | 50°F | 0.1" | 0" |
| 1984 | 79°F | 53°F | 0" | 0" |
| 1981 | 60°F | 42°F | 7.85" | 0" |
| 1980 | 75°F | 59°F | 0.51" | -- |
| 1979 | 81°F | 45°F | 0" | 0" |
| 1978 | 74°F | -- | 0" | 0" |
| 1977 | 81°F | 55°F | 0" | 0" |
| 1976 | 64°F | 45°F | 0.05" | 0" |
| 1975 | 81°F | 55°F | 0" | 0" |
| 1974 | 80°F | 64°F | 0.3" | 0" |
| 1973 | 67°F | 47°F | 0" | 0" |
| 1972 | 84°F | 62°F | 0" | 0" |
| 1971 | 78°F | 66°F | 0" | 0" |