Weather on March 21
Sioux Falls, SD
55 Years of Data
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.
| 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° | — | — |
Sioux Falls, SD Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Sioux Falls, SD Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Sioux Falls, SD 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 Sioux Falls, SD
Sioux Falls, SD has no months that meet our "pleasant" threshold — every season has tradeoffs.