September weather in Slater, IA
The average temperature in Slater in September is 63.5°F (51.0°F–75.9°F). Average precipitation: 3.84 inches.
September is a fall month in Slater, and is warmer than the annual average of 48°F. Daily temperatures swing about 24.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
75.9°F
Avg Low
51.0°F
Precipitation
3.84 in
Daylight
12h 16m
September records in Slater
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2000) | 44.1°F (2009) | 3.35 in (2010) |
| September 2 | 95.0°F (2011) | 44.1°F (2009) | 1.75 in (2018) |
| September 3 | 97.0°F (2000) | 44.1°F (1997) | 1.61 in (2006) |
| September 4 | 96.1°F (2023) | 44.1°F (1997) | 1.18 in (2011) |
| September 5 | 95.0°F (2023) | 44.1°F (2008) | 2.78 in (2004) |
| September 6 | 93.0°F (2023) | 43.0°F (2011) | 0.79 in (1983) |
| September 7 | 93.9°F (2020) | 42.1°F (2017) | 2.07 in (2015) |
| September 8 | 91.0°F (2002) | 39.9°F (2017) | 3.84 in (2001) |
| September 9 | 91.9°F (2002) | 42.1°F (2008) | 1.14 in (1989) |
| September 10 | 99.0°F (2013) | 41.0°F (2008) | 2.45 in (2019) |
| September 11 | 97.0°F (2013) | 44.1°F (1997) | 3.25 in (2006) |
| September 12 | 99.0°F (2000) | 37.9°F (2007) | 1.15 in (1991) |
| September 13 | 93.0°F (1998) | 35.1°F (2014) | 1.69 in (1982) |
| September 14 | 98.1°F (2025) | 34.0°F (2014) | 0.51 in (1993) |
| September 15 | 93.0°F (2025) | 33.1°F (2007) | 0.63 in (1992) |
| September 16 | 93.0°F (2025) | 33.1°F (2007) | 2.40 in (2016) |
| September 17 | 93.0°F (2025) | 37.0°F (2014) | 1.42 in (2017) |
| September 18 | 90.0°F (2018) | 37.9°F (1999) | 0.76 in (1978) |
| September 19 | 91.0°F (2000) | 39.0°F (2003) | 1.13 in (1983) |
| September 20 | 89.1°F (1998) | 33.1°F (2006) | 2.56 in (2023) |
| September 21 | 93.0°F (2022) | 33.1°F (1999) | 1.72 in (1986) |
| September 22 | 91.0°F (2016) | 33.1°F (1999) | 1.17 in (2010) |
| September 23 | 90.0°F (2017) | 30.9°F (2012) | 4.54 in (2016) |
| September 24 | 90.0°F (2017) | 30.0°F (2012) | 1.15 in (2010) |
| September 25 | 89.1°F (2017) | 33.1°F (2002) | 1.54 in (1984) |
| September 26 | 87.1°F (1998) | 34.0°F (2001) | 1.57 in (1996) |
| September 27 | 89.1°F (1998) | 34.0°F (2000) | 0.84 in (1999) |
| September 28 | 90.0°F (2021) | 33.1°F (2022) | 0.28 in (1999) |
| September 29 | 89.1°F (2025) | 30.9°F (2003) | 0.69 in (1985) |
| September 30 | 91.0°F (2025) | 28.9°F (2003) | 0.82 in (1985) |