Weather on March 21
Saint Louis, MO
55 Years of Data
Avg High
59°F
Avg Low
38°F
Warmest
2012
73°F avg
Coldest
2013
27°F avg
About This Date
March 21st in Saint Louis, MO typically brings cool spring weather, with average highs around 59°F and lows near 38°F. Over 55 years of records, the warmest March 21st was in 2012 (73°F average), while the coldest was 2013 (27°F) — a 46°F range across recorded history. Precipitation has occurred on 36% of recorded March 21st dates, with snow falling 4% of the time (heaviest snowfall: 5"). The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Saint Louis, MO? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 48° | 67° | — | — |
| 2025 | 67° | 28° | 48° | — | — |
| 2024 | 56° | 31° | 44° | — | — |
| 2023 | 51° | 39° | 45° | 0.1" | — |
| 2022 | 76° | 50° | 63° | 1.09" | — |
| 2021 | 68° | 33° | 51° | — | — |
| 2020 | 45° | 34° | 39° | — | — |
| 2019 | 55° | 35° | 45° | — | — |
| 2018 | 50° | 34° | 42° | — | — |
| 2017 | 86° | 46° | 66° | — | — |
| 2016 | 46° | 33° | 40° | 0.03" | — |
| 2015 | 58° | 41° | 49° | — | — |
| 2014 | 69° | 49° | 59° | — | — |
| 2013coldest | 35° | 20° | 27° | — | — |
| 2012warmest | 81° | 65° | 73° | — | — |
| 2011 | 81° | 47° | 64° | — | — |
| 2010 | 47° | 37° | 42° | 0.03" | — |
| 2009 | 57° | 36° | 46° | 0.25" | — |
| 2008 | 62° | 36° | 49° | — | — |
| 2007 | 61° | 45° | 53° | 0.2" | — |
| 2006 | 44° | 30° | 37° | 1.5" | 0.7" |
| 2005 | 55° | 36° | 45° | — | — |
| 2004 | 74° | 33° | 53° | — | — |
| 2003 | 65° | 42° | 53° | 0.2" | — |
| 2002 | 46° | 28° | 37° | — | — |
| 2001 | 57° | 32° | 45° | — | — |
| 2000 | 46° | 34° | 40° | 0.1" | — |
| 1999 | 54° | 34° | 44° | — | — |
| 1998 | 36° | 32° | 34° | 0.33" | — |
| 1997 | 68° | 41° | 55° | — | — |
| 1996 | 48° | 26° | 37° | — | — |
| 1995 | 70° | 45° | 57° | — | — |
| 1994 | 70° | 36° | 53° | — | — |
| 1993 | 46° | 39° | 43° | 0.08" | — |
| 1992 | 62° | 33° | 48° | — | — |
| 1991 | 82° | 57° | 70° | — | — |
| 1990 | 70° | 46° | 58° | — | — |
| 1989 | 42° | 22° | 32° | 0.33" | — |
| 1988 | 58° | 39° | 48° | — | — |
| 1987 | 70° | 45° | 57° | — | — |
| 1986 | 41° | 25° | 33° | — | — |
| 1985 | 58° | 44° | 51° | 0.05" | — |
| 1984 | 50° | 33° | 42° | — | — |
| 1983 | 42° | 29° | 35° | 0.46" | — |
| 1982 | 72° | 40° | 56° | — | — |
| 1980 | 64° | 28° | 46° | — | — |
| 1979 | 59° | 43° | 51° | 0.69" | — |
| 1978 | 63° | 38° | 50° | 1.78" | — |
| 1977 | 48° | 30° | 39° | — | — |
| 1976 | 75° | 43° | 59° | 1.22" | — |
| 1975 | 75° | 46° | 61° | — | — |
| 1974 | 46° | 25° | 35° | 1.27" | 5" |
| 1973 | 45° | 32° | 38° | 0.23" | — |
| 1972 | 78° | 58° | 68° | 0.15" | — |
| 1971 | 49° | — | — | — | — |
55 years of data from ST LOUIS ST LOUIS UNIV