Weather on September 15
Sioux Falls, SD
55 Years of Data
Avg High
74°F
Avg Low
50°F
Warmest
2018
82°F avg
Coldest
2011
44°F avg
About This Date
September 15th in Sioux Falls, SD typically brings pleasant fall weather, with average highs around 74°F and lows near 50°F. Over 55 years of records, the warmest September 15th was in 2018 (82°F average), while the coldest was 2011 (44°F) — a 38°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 15th dates historically, with the wettest September 15th recording 9.17" of rain. The last decade has been 13.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 13.4°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Sioux Falls, SD? Great weather for outdoor activities.
Warming Trend
2.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 61° | 74° | — | — |
| 2024 | 86° | 66° | 76° | — | — |
| 2023 | 80° | 57° | 69° | 0.13" | — |
| 2022 | 81° | 66° | 73° | 2.39" | — |
| 2021 | 80° | 48° | 64° | — | — |
| 2020 | 87° | 61° | 74° | — | — |
| 2019 | 84° | 62° | 73° | — | — |
| 2018warmest | 93° | 71° | 82° | — | — |
| 2017 | 87° | 63° | 75° | — | — |
| 2016 | 67° | 61° | 64° | 9.17" | — |
| 2015 | 84° | 65° | 74° | — | — |
| 2014 | 64° | 43° | 53° | 0.79" | — |
| 2013 | 67° | 46° | 56° | — | — |
| 2012 | 85° | 48° | 66° | — | — |
| 2011coldest | 55° | 32° | 44° | 0.13" | — |
| 2010 | 76° | 54° | 65° | 2.31" | — |
| 2009 | 80° | 47° | 63° | — | — |
| 2008 | 75° | 38° | 56° | — | — |
| 2007 | 60° | 30° | 45° | — | — |
| 2006 | 73° | 63° | 68° | 1.78" | — |
| 2005 | 78° | 56° | 67° | — | — |
| 2004 | 67° | 51° | 59° | 2.21" | — |
| 2003 | 79° | 43° | 61° | — | — |
| 2002 | 71° | 40° | 55° | — | — |
| 2001 | 57° | 50° | 54° | 0.08" | — |
| 2000 | 71° | 34° | 52° | — | — |
| 1999 | 68° | 38° | 53° | — | — |
| 1998 | 78° | 52° | 65° | — | — |
| 1997 | 83° | 61° | 72° | 0.23" | — |
| 1996 | 69° | 36° | 52° | — | — |
| 1995 | 86° | 58° | 72° | — | — |
| 1994 | 81° | 59° | 70° | — | — |
| 1993 | 65° | 32° | 48° | — | — |
| 1992 | 82° | 59° | 71° | 0.05" | — |
| 1991 | 74° | 53° | 63° | — | — |
| 1990 | 84° | 47° | 65° | — | — |
| 1989 | 73° | 45° | 59° | — | — |
| 1988 | 64° | 57° | 61° | 3.81" | — |
| 1987 | 71° | 56° | 63° | 1.35" | — |
| 1986 | 55° | 49° | 52° | — | — |
| 1985 | 72° | 52° | 62° | — | — |
| 1984 | 68° | 36° | 52° | — | — |
| 1983 | 72° | 52° | 62° | 0.33" | — |
| 1982 | 57° | 48° | 53° | — | — |
| 1981 | 73° | 43° | 58° | 0.03" | — |
| 1980 | 87° | 55° | 71° | — | — |
| 1979 | 75° | 42° | 59° | — | — |
| 1978 | 74° | 49° | 61° | — | — |
| 1977 | 73° | 51° | 62° | — | — |
| 1976 | 72° | 52° | 62° | — | — |
| 1975 | 65° | 55° | 60° | — | — |
| 1974 | 75° | 42° | 59° | — | — |
| 1973 | 55° | 43° | 49° | 0.38" | — |
| 1972 | 77° | 51° | 64° | — | — |
| 1971 | 72° | 41° | 56° | — | — |
55 years of data from SIOUX FALLS