Weather on September 12
Sioux Falls, SD
55 Years of Data
About This Date
September 12th in Sioux Falls, SD typically brings pleasant fall weather, with average highs around 76°F and lows near 53°F. Over 55 years of records, the warmest September 12th was in 1990 (81°F average), while the coldest was 1974 (44°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 35% of September 12th dates historically, with the wettest September 12th recording 4.01" 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 September 12th in Sioux Falls, SD? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 66° | 78° | — | — |
| 2024 | 86° | 62° | 74° | — | — |
| 2023 | 77° | 49° | 63° | 0.03" | — |
| 2022 | 81° | 43° | 62° | — | — |
| 2021 | 76° | 57° | 66° | 0.1" | — |
| 2020 | 69° | 53° | 61° | 0.15" | — |
| 2019 | 74° | 58° | 66° | 2.74" | — |
| 2018 | 85° | 65° | 75° | — | — |
| 2017 | 85° | 60° | 72° | — | — |
| 2016 | 69° | 60° | 65° | — | — |
| 2015 | 70° | 39° | 54° | — | — |
| 2014 | 56° | 38° | 47° | 0.1" | — |
| 2013 | 78° | 53° | 66° | — | — |
| 2012 | 67° | 51° | 59° | 0.74" | — |
| 2011 | 90° | 55° | 72° | — | — |
| 2010 | 83° | 45° | 64° | — | — |
| 2009 | 77° | 59° | 68° | — | — |
| 2008 | 72° | 51° | 61° | — | — |
| 2007 | 72° | 39° | 55° | — | — |
| 2006 | 72° | 44° | 58° | — | — |
| 2005 | 83° | 66° | 74° | 0.86" | — |
| 2004 | 89° | 62° | 76° | — | — |
| 2003 | 80° | 45° | 62° | — | — |
| 2002 | 76° | 52° | 64° | 0.33" | — |
| 2001 | 77° | 54° | 65° | — | — |
| 2000 | 78° | 40° | 59° | — | — |
| 1999 | 66° | 51° | 59° | 0.25" | — |
| 1998 | 92° | 56° | 74° | — | — |
| 1997 | 80° | 57° | 69° | 0.18" | — |
| 1996 | 63° | 43° | 53° | — | — |
| 1995 | 80° | 57° | 69° | — | — |
| 1994 | 87° | 70° | 78° | — | — |
| 1993 | 93° | 61° | 77° | — | — |
| 1992 | 73° | 60° | 67° | — | — |
| 1991 | 76° | 64° | 70° | — | — |
| 1990warmest | 96° | 67° | 81° | — | — |
| 1989 | 54° | 37° | 45° | — | — |
| 1988 | 62° | 47° | 54° | 0.53" | — |
| 1987 | 70° | 45° | 57° | — | — |
| 1986 | 75° | 42° | 59° | — | — |
| 1985 | 61° | 50° | 55° | 1.73" | — |
| 1984 | 88° | 58° | 73° | 0.08" | — |
| 1983 | 62° | 44° | 53° | — | — |
| 1982 | 66° | 55° | 61° | 0.23" | — |
| 1981 | 89° | 46° | 68° | — | — |
| 1980 | 81° | 57° | 69° | — | — |
| 1979 | 67° | 51° | 59° | 4.01" | — |
| 1978 | 79° | 65° | 72° | — | — |
| 1977 | 67° | 53° | 60° | 2.82" | — |
| 1976 | 90° | 65° | 77° | — | — |
| 1975 | 64° | 35° | 50° | — | — |
| 1974coldest | 52° | 37° | 44° | 0.43" | — |
| 1973 | 63° | 49° | 56° | 0.15" | — |
| 1972 | 75° | 64° | 70° | 0.86" | — |
| 1971 | 78° | 50° | 64° | — | — |
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.