Weather on August 20
Sioux Falls, SD
55 Years of Data
Avg High
82°F
Avg Low
60°F
Warmest
1974
83°F avg
Coldest
2004
58°F avg
About This Date
August 20th in Sioux Falls, SD typically brings warm summer weather, with average highs around 82°F and lows near 60°F. Over 55 years of records, the warmest August 20th was in 1974 (83°F average), while the coldest was 2004 (58°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 45% of August 20th dates historically, with the wettest August 20th recording 3.84" of rain. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Sioux Falls, SD? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 66° | 75° | — | — |
| 2024 | 70° | 59° | 64° | 1.04" | — |
| 2023 | 83° | 63° | 73° | — | — |
| 2022 | 81° | 61° | 71° | — | — |
| 2021 | 83° | 66° | 74° | 0.58" | — |
| 2020 | 87° | 66° | 77° | — | — |
| 2019 | 89° | 67° | 78° | 0.03" | — |
| 2018 | 74° | 61° | 67° | 0.43" | — |
| 2017 | 84° | 62° | 73° | — | — |
| 2016 | 74° | 55° | 64° | 0.3" | — |
| 2015 | 79° | 48° | 63° | — | — |
| 2014 | 83° | 66° | 74° | 0.08" | — |
| 2013 | 90° | 66° | 78° | — | — |
| 2012 | 80° | 50° | 65° | — | — |
| 2011 | 74° | 58° | 66° | 0.03" | — |
| 2010 | 86° | 70° | 78° | 0.38" | — |
| 2009 | 73° | 56° | 64° | 0.2" | — |
| 2008 | 82° | 65° | 73° | — | — |
| 2007 | 81° | 68° | 74° | 1.19" | — |
| 2006 | 78° | 50° | 64° | — | — |
| 2005 | 84° | 56° | 70° | — | — |
| 2004coldest | 69° | 46° | 58° | — | — |
| 2003 | 90° | 66° | 78° | 3" | — |
| 2002 | 82° | 54° | 68° | 3.84" | — |
| 2001 | 82° | 62° | 72° | — | — |
| 2000 | 74° | 60° | 67° | — | — |
| 1999 | 82° | 56° | 69° | 0.05" | — |
| 1998 | 81° | 67° | 74° | 0.05" | — |
| 1997 | 77° | 52° | 64° | — | — |
| 1996 | 80° | 48° | 64° | — | — |
| 1995 | 85° | 62° | 73° | — | — |
| 1994 | 77° | 55° | 66° | — | — |
| 1993 | 76° | 59° | 67° | — | — |
| 1992 | 83° | 61° | 72° | — | — |
| 1991 | 85° | 58° | 71° | 0.69" | — |
| 1990 | 68° | 60° | 64° | 0.64" | — |
| 1989 | 79° | 56° | 67° | 0.08" | — |
| 1988 | 85° | 55° | 70° | — | — |
| 1987 | 82° | 56° | 69° | — | — |
| 1986 | 74° | 50° | 62° | 0.79" | — |
| 1985 | 71° | 51° | 61° | 0.05" | — |
| 1984 | 80° | 64° | 72° | 0.25" | — |
| 1983 | 94° | 65° | 79° | — | — |
| 1982 | 85° | 60° | 72° | — | — |
| 1981 | 82° | 60° | 71° | — | — |
| 1980 | 83° | 60° | 71° | 0.23" | — |
| 1979 | 82° | 67° | 74° | 0.38" | — |
| 1978 | 82° | 56° | 69° | — | — |
| 1977 | 80° | 53° | 67° | 0.91" | — |
| 1976 | 94° | 67° | 80° | — | — |
| 1975 | 90° | 71° | 80° | — | — |
| 1974warmest | 95° | 72° | 83° | 1.7" | — |
| 1973 | 86° | 57° | 72° | — | — |
| 1972 | 96° | 68° | 82° | 0.36" | — |
| 1971 | 89° | 59° | 74° | — | — |
55 years of data from SIOUX FALLS