Weather on August 15
Sioux Falls, SD
55 Years of Data
Avg High
82°F
Avg Low
60°F
Warmest
1988
87°F avg
Coldest
1979
54°F avg
About This Date
August 15th 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 15th was in 1988 (87°F average), while the coldest was 1979 (54°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 25% of August 15th dates historically, with the wettest August 15th recording 8.2" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for August 15th in Sioux Falls, SD? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 71° | 79° | — | — |
| 2024 | 84° | 62° | 73° | 0.08" | — |
| 2023 | 83° | 53° | 68° | — | — |
| 2022 | 69° | 61° | 65° | 0.33" | — |
| 2021 | 86° | 62° | 74° | — | — |
| 2020 | 87° | 54° | 70° | 0.03" | — |
| 2019 | 80° | 57° | 69° | 1.88" | — |
| 2018 | 84° | 64° | 74° | 0.15" | — |
| 2017 | 75° | 60° | 68° | 0.2" | — |
| 2016 | 84° | 63° | 73° | — | — |
| 2015 | 91° | 70° | 80° | — | — |
| 2014 | 80° | 65° | 72° | 2.77" | — |
| 2013 | 66° | 57° | 62° | — | — |
| 2012 | 89° | 64° | 77° | — | — |
| 2011 | 83° | 66° | 74° | — | — |
| 2010 | 77° | 58° | 67° | — | — |
| 2009 | 77° | 69° | 73° | 0.56" | — |
| 2008 | 78° | 60° | 69° | — | — |
| 2007 | 84° | 68° | 76° | 0.64" | — |
| 2006 | 84° | 55° | 70° | — | — |
| 2005 | 77° | 54° | 65° | — | — |
| 2004 | 76° | 47° | 61° | — | — |
| 2003 | 91° | 68° | 80° | — | — |
| 2002 | 77° | 60° | 69° | — | — |
| 2001 | 79° | 59° | 69° | — | — |
| 2000 | 78° | 55° | 67° | — | — |
| 1999 | 87° | 63° | 75° | — | — |
| 1998 | 78° | 51° | 65° | — | — |
| 1997 | 84° | 59° | 72° | — | — |
| 1996 | 78° | 49° | 63° | — | — |
| 1995 | 84° | 56° | 70° | — | — |
| 1994 | 80° | 48° | 64° | — | — |
| 1993 | 86° | 65° | 75° | 3.12" | — |
| 1992 | 72° | 46° | 59° | — | — |
| 1991 | 95° | 67° | 81° | 0.08" | — |
| 1990 | 85° | 57° | 71° | — | — |
| 1989 | 78° | 56° | 67° | — | — |
| 1988warmest | 105° | 70° | 87° | — | — |
| 1987 | 95° | 71° | 83° | — | — |
| 1986 | 89° | 56° | 72° | — | — |
| 1985 | 73° | 52° | 62° | — | — |
| 1984 | 87° | 68° | 78° | — | — |
| 1983 | 93° | 68° | 81° | — | — |
| 1982 | 84° | 66° | 75° | — | — |
| 1981 | 81° | 59° | 70° | — | — |
| 1980 | 79° | 55° | 67° | — | — |
| 1979coldest | 60° | 49° | 54° | 0.05" | — |
| 1978 | 76° | 59° | 67° | 1.27" | — |
| 1977 | 70° | 60° | 65° | 8.2" | — |
| 1976 | 80° | 59° | 70° | — | — |
| 1975 | 81° | 56° | 68° | — | — |
| 1974 | 84° | 67° | 75° | — | — |
| 1973 | 90° | 65° | 77° | — | — |
| 1972 | 93° | 75° | 84° | — | — |
| 1971 | 86° | 52° | 69° | — | — |
55 years of data from SIOUX FALLS