Weather on September 18
Sioux Falls, SD
55 Years of Data
About This Date
September 18th in Sioux Falls, SD typically brings pleasant fall weather, with average highs around 74°F and lows near 51°F. Over 55 years of records, the warmest September 18th was in 2013 (77°F average), while the coldest was 1991 (37°F) — a 40°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 18th dates historically, with the wettest September 18th recording 5.26" of rain. The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Sioux Falls, SD? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 60° | 69° | — | — |
| 2024 | 85° | 69° | 77° | — | — |
| 2023 | 87° | 59° | 73° | — | — |
| 2022 | 77° | 53° | 65° | — | — |
| 2021 | 85° | 49° | 67° | — | — |
| 2020 | 71° | 44° | 58° | — | — |
| 2019 | 79° | 61° | 70° | — | — |
| 2018 | 70° | 61° | 65° | 1.8" | — |
| 2017 | 75° | 58° | 66° | 0.05" | — |
| 2016 | 83° | 58° | 70° | — | — |
| 2015 | 59° | 47° | 53° | 0.15" | — |
| 2014 | 77° | 52° | 64° | — | — |
| 2013warmest | 88° | 66° | 77° | — | — |
| 2012 | 68° | 34° | 51° | — | — |
| 2011 | 74° | 49° | 61° | — | — |
| 2010 | 50° | 40° | 45° | 0.13" | — |
| 2009 | 84° | 53° | 69° | — | — |
| 2008 | 82° | 51° | 67° | — | — |
| 2007 | 77° | 52° | 64° | 0.51" | — |
| 2006 | 51° | 43° | 47° | 0.08" | — |
| 2005 | 82° | 52° | 67° | 0.05" | — |
| 2004 | 84° | 54° | 69° | — | — |
| 2003 | 57° | 38° | 47° | 1.73" | — |
| 2002 | 79° | 57° | 68° | 1.17" | — |
| 2001 | 64° | 54° | 59° | — | — |
| 2000 | 83° | 67° | 75° | — | — |
| 1999 | 82° | 52° | 67° | — | — |
| 1998 | 90° | 63° | 76° | — | — |
| 1997 | 85° | 60° | 72° | — | — |
| 1996 | 62° | 50° | 56° | — | — |
| 1995 | 62° | 55° | 59° | 1.52" | — |
| 1994 | 82° | 46° | 64° | — | — |
| 1993 | 61° | 49° | 55° | — | — |
| 1992 | 60° | 42° | 51° | — | — |
| 1991coldest | 45° | 30° | 37° | — | — |
| 1990 | 65° | 55° | 60° | 0.58" | — |
| 1989 | 84° | 63° | 73° | — | — |
| 1988 | 83° | 63° | 73° | 0.76" | — |
| 1987 | 65° | 45° | 55° | — | — |
| 1986 | 60° | 51° | 56° | 5.26" | — |
| 1985 | 83° | 65° | 74° | — | — |
| 1984 | 91° | 57° | 74° | — | — |
| 1983 | 69° | 45° | 57° | — | — |
| 1982 | 71° | 39° | 55° | — | — |
| 1981 | 79° | 38° | 58° | — | — |
| 1980 | 64° | 51° | 58° | — | — |
| 1979 | 70° | 48° | 59° | — | — |
| 1978 | 80° | 55° | 68° | 0.28" | — |
| 1977 | 68° | 53° | 61° | 0.08" | — |
| 1976 | 87° | 58° | 72° | — | — |
| 1975 | 64° | 48° | 56° | — | — |
| 1974 | 91° | 45° | 68° | — | — |
| 1973 | 69° | 36° | 52° | — | — |
| 1972 | 87° | 47° | 67° | — | — |
| 1971 | 62° | 34° | 48° | — | — |
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.