Weather on March 21
Sioux Falls, SD
55 Years of Data
Avg High
47°F
Avg Low
25°F
Warmest
2026
62°F avg
Coldest
2002
8°F avg
About This Date
March 21st in Sioux Falls, SD typically brings chilly spring weather, with average highs around 47°F and lows near 25°F. Over 56 years of records, the warmest March 21st was in 2026 (62°F average), while the coldest was 2002 (8°F) — a 54°F range across recorded history. Precipitation has occurred on 18% of recorded March 21st dates, with snow falling 9% of the time (heaviest snowfall: 11.7"). The last decade has been 10.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.3°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Sioux Falls, SD? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 89° | 35° | 62° | — | — |
| 2025 | 56° | 25° | 41° | — | — |
| 2024 | 49° | 25° | 37° | — | 0.1" |
| 2023 | 43° | 24° | 34° | — | — |
| 2022 | 61° | 41° | 51° | — | — |
| 2021 | 62° | 34° | 48° | — | — |
| 2020 | 35° | 19° | 27° | — | — |
| 2019 | 55° | 23° | 39° | — | — |
| 2018 | 51° | 29° | 40° | — | — |
| 2017 | 41° | 24° | 33° | — | — |
| 2016 | 67° | 30° | 49° | — | — |
| 2015 | 51° | 23° | 37° | — | — |
| 2014 | 45° | 20° | 33° | — | — |
| 2013 | 35° | 8° | 22° | — | — |
| 2012 | 67° | 47° | 57° | 0.1" | — |
| 2011 | 50° | 26° | 38° | 0.2" | — |
| 2010 | 50° | 17° | 34° | — | — |
| 2009 | 69° | 27° | 48° | — | — |
| 2008 | 40° | 33° | 36° | 0.03" | — |
| 2007 | 63° | 36° | 49° | — | — |
| 2006 | 28° | 17° | 23° | 0.2" | 1.3" |
| 2005 | 36° | 29° | 32° | — | — |
| 2004 | 37° | 17° | 27° | — | — |
| 2003 | 53° | 27° | 40° | — | — |
| 2002coldest | 13° | 4° | 8° | — | — |
| 2001 | 35° | 31° | 33° | — | — |
| 2000 | 50° | 36° | 43° | — | — |
| 1999 | 47° | 22° | 34° | — | — |
| 1998 | 44° | 20° | 32° | — | — |
| 1997 | 44° | 31° | 37° | — | — |
| 1996 | 45° | 16° | 30° | — | — |
| 1995 | 55° | 25° | 40° | — | — |
| 1994 | 61° | 27° | 44° | — | — |
| 1993 | 31° | 27° | 29° | 2.64" | 11.7" |
| 1992 | 33° | 21° | 27° | — | — |
| 1991 | 47° | 40° | 43° | — | — |
| 1990 | 64° | 30° | 47° | 0.53" | — |
| 1989 | 41° | 10° | 26° | — | — |
| 1988 | 60° | 25° | 42° | — | — |
| 1987 | 50° | 39° | 45° | 0.25" | — |
| 1986 | 46° | 24° | 35° | — | — |
| 1985 | 65° | 35° | 50° | — | — |
| 1984 | 36° | 29° | 32° | — | — |
| 1983 | 26° | 11° | 18° | — | — |
| 1982 | 36° | 24° | 30° | 0.03" | 0.1" |
| 1981 | 48° | 33° | 41° | — | — |
| 1980 | 44° | 19° | 32° | — | — |
| 1979 | 44° | 31° | 37° | 1.3" | — |
| 1978 | 58° | 29° | 43° | — | — |
| 1977 | 33° | 7° | 20° | — | — |
| 1976 | 38° | 21° | 29° | — | — |
| 1975 | 52° | 30° | 41° | — | — |
| 1974 | 32° | 5° | 19° | 0.03" | 0.1" |
| 1973 | 54° | 26° | 40° | — | — |
| 1972 | 50° | 33° | 42° | — | — |
| 1971 | 35° | 28° | 32° | — | — |
56 years of data from SIOUX FALLS