Weather on May 20
Sioux Falls, SD
55 Years of Data
Avg High
72°F
Avg Low
48°F
Warmest
1972
75°F avg
Coldest
2017
44°F avg
About This Date
May 20th in Sioux Falls, SD typically brings pleasant spring weather, with average highs around 72°F and lows near 48°F. Over 55 years of records, the warmest May 20th was in 1972 (75°F average), while the coldest was 2017 (44°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 20th dates historically, with the wettest May 20th recording 4.8" of rain. The last decade has been 2.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.4°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Sioux Falls, SD? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 53° | 42° | 48° | 0.25" | — |
| 2024 | 78° | 53° | 66° | 0.08" | — |
| 2023 | 74° | 36° | 55° | — | — |
| 2022 | 60° | 46° | 53° | 0.03" | — |
| 2021 | 73° | 64° | 69° | — | — |
| 2020 | 69° | 57° | 63° | — | — |
| 2019 | 58° | 33° | 45° | — | — |
| 2018 | 60° | 48° | 54° | 0.05" | — |
| 2017coldest | 46° | 41° | 44° | 1.68" | — |
| 2016 | 65° | 48° | 56° | — | — |
| 2015 | 60° | 45° | 52° | — | — |
| 2014 | 79° | 48° | 63° | — | — |
| 2013 | 67° | 55° | 61° | — | — |
| 2012 | 67° | 49° | 58° | 0.91" | — |
| 2011 | 65° | 58° | 61° | 2.13" | — |
| 2010 | 77° | 45° | 61° | — | — |
| 2009 | 90° | 61° | 75° | — | — |
| 2008 | 68° | 43° | 55° | — | — |
| 2007 | 84° | 53° | 69° | — | — |
| 2006 | 80° | 47° | 63° | — | — |
| 2005 | 81° | 52° | 66° | — | — |
| 2004 | 70° | 57° | 63° | — | — |
| 2003 | 60° | 35° | 48° | — | — |
| 2002 | 63° | 31° | 47° | — | — |
| 2001 | 68° | 43° | 55° | 0.43" | — |
| 2000 | 75° | 42° | 59° | — | — |
| 1999 | 69° | 56° | 62° | 4.8" | — |
| 1998 | 80° | 57° | 69° | 0.03" | — |
| 1997 | 60° | 33° | 47° | — | — |
| 1996 | 71° | 51° | 61° | 0.33" | — |
| 1995 | 67° | 45° | 56° | — | — |
| 1994 | 85° | 58° | 71° | — | — |
| 1993 | 64° | 36° | 50° | — | — |
| 1992 | 83° | 63° | 73° | — | — |
| 1991 | 71° | 56° | 63° | — | — |
| 1990 | 58° | 43° | 50° | — | — |
| 1989 | 75° | 37° | 56° | — | — |
| 1988 | 77° | 60° | 69° | 1.35" | — |
| 1987 | 81° | 63° | 72° | 0.56" | — |
| 1986 | 70° | 42° | 56° | — | — |
| 1985 | 71° | 39° | 55° | — | — |
| 1984 | 82° | 47° | 64° | — | — |
| 1983 | 67° | 44° | 55° | — | — |
| 1982 | 67° | 56° | 61° | 0.1" | — |
| 1981 | 77° | 39° | 58° | — | — |
| 1980 | 74° | 43° | 58° | — | — |
| 1979 | 63° | 44° | 53° | 0.05" | — |
| 1978 | 69° | 45° | 57° | — | — |
| 1977 | 75° | 60° | 68° | 0.28" | — |
| 1976 | 87° | 56° | 71° | — | — |
| 1975 | 93° | 57° | 75° | 0.23" | — |
| 1974 | 86° | 64° | 75° | 0.15" | — |
| 1973 | 85° | 40° | 62° | — | — |
| 1972warmest | 86° | 65° | 75° | — | — |
| 1971 | 72° | 36° | 54° | — | — |
55 years of data from SIOUX FALLS