Weather on March 21
Saint Louis, MO
55 Years of Data
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.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 48° | 67° | — | — |
| 2025 | 67° | 28° | 48° | — | — |
| 2024 | 56° | 31° | 44° | — | — |
| 2023 | 51° | 39° | 45° | 0.04" | — |
| 2022 | 76° | 50° | 63° | 0.43" | — |
| 2021 | 68° | 33° | 51° | — | — |
| 2020 | 45° | 34° | 39° | — | — |
| 2019 | 55° | 35° | 45° | — | — |
| 2018 | 50° | 34° | 42° | — | — |
| 2017 | 86° | 46° | 66° | — | — |
| 2016 | 46° | 33° | 40° | 0.01" | — |
| 2015 | 58° | 41° | 49° | — | — |
| 2014 | 69° | 49° | 59° | — | — |
| 2013coldest | 35° | 20° | 27° | — | — |
| 2012warmest | 81° | 65° | 73° | — | — |
| 2011 | 81° | 47° | 64° | — | — |
| 2010 | 47° | 37° | 42° | 0.01" | — |
| 2009 | 57° | 36° | 46° | 0.1" | — |
| 2008 | 62° | 36° | 49° | — | — |
| 2007 | 61° | 45° | 53° | 0.08" | — |
| 2006 | 44° | 30° | 37° | 0.59" | 0.7" |
| 2005 | 55° | 36° | 45° | — | — |
| 2004 | 74° | 33° | 53° | — | — |
| 2003 | 65° | 42° | 53° | 0.08" | — |
| 2002 | 46° | 28° | 37° | — | — |
| 2001 | 57° | 32° | 45° | — | — |
| 2000 | 46° | 34° | 40° | 0.04" | — |
| 1999 | 54° | 34° | 44° | — | — |
| 1998 | 36° | 32° | 34° | 0.13" | — |
| 1997 | 68° | 41° | 55° | — | — |
| 1996 | 48° | 26° | 37° | — | — |
| 1995 | 70° | 45° | 57° | — | — |
| 1994 | 70° | 36° | 53° | — | — |
| 1993 | 46° | 39° | 43° | 0.03" | — |
| 1992 | 62° | 33° | 48° | — | — |
| 1991 | 82° | 57° | 70° | — | — |
| 1990 | 70° | 46° | 58° | — | — |
| 1989 | 42° | 22° | 32° | 0.13" | — |
| 1988 | 58° | 39° | 48° | — | — |
| 1987 | 70° | 45° | 57° | — | — |
| 1986 | 41° | 25° | 33° | — | — |
| 1985 | 58° | 44° | 51° | 0.02" | — |
| 1984 | 50° | 33° | 42° | — | — |
| 1983 | 42° | 29° | 35° | 0.18" | — |
| 1982 | 72° | 40° | 56° | — | — |
| 1980 | 64° | 28° | 46° | — | — |
| 1979 | 59° | 43° | 51° | 0.27" | — |
| 1978 | 63° | 38° | 50° | 0.7" | — |
| 1977 | 48° | 30° | 39° | — | — |
| 1976 | 75° | 43° | 59° | 0.48" | — |
| 1975 | 75° | 46° | 61° | — | — |
| 1974 | 46° | 25° | 35° | 0.5" | 5" |
| 1973 | 45° | 32° | 38° | 0.09" | — |
| 1972 | 78° | 58° | 68° | 0.06" | — |
| 1971 | 49° | — | — | — | — |
Saint Louis, MO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Saint Louis, MO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Saint Louis, MO Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Saint Louis, MO
Most pleasant months in Saint Louis, MO: April, May, September, October.
What to expect on March 21st
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
March 21st outlook →