September weather in Lockport, IL
The average temperature in Lockport in September is 65.9°F (55.4°F–76.4°F). Average precipitation: 3.31 inches.
September is a fall month in Lockport, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 21°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.4°F
Avg Low
55.4°F
Precipitation
3.31 in
Daylight
12h 16m
September records in Lockport
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2000) | 46.9°F (2009) | 1.54 in (2019) |
| September 2 | 93.0°F (2008) | 46.9°F (2017) | 1.11 in (2010) |
| September 3 | 90.0°F (1999) | 50.0°F (1997) | 0.52 in (2018) |
| September 4 | 91.9°F (1999) | 43.0°F (1997) | 2.70 in (2008) |
| September 5 | 91.0°F (1999) | 46.9°F (1997) | 0.44 in (2018) |
| September 6 | 93.0°F (1998) | 43.0°F (2025) | 2.28 in (2023) |
| September 7 | 91.0°F (2002) | 43.0°F (2025) | 1.19 in (1998) |
| September 8 | 93.9°F (2002) | 43.0°F (2024) | 1.09 in (2008) |
| September 9 | 91.9°F (2002) | 46.0°F (2008) | 0.56 in (2001) |
| September 10 | 93.0°F (2013) | 44.1°F (1999) | 1.89 in (2014) |
| September 11 | 93.0°F (2000) | 46.9°F (1999) | 2.17 in (2022) |
| September 12 | 91.0°F (2005) | 44.1°F (2007) | 0.72 in (2008) |
| September 13 | 93.9°F (2005) | 37.9°F (2014) | 3.35 in (2008) |
| September 14 | 90.0°F (2024) | 41.0°F (2014) | 2.05 in (2008) |
| September 15 | 89.1°F (2024) | 37.9°F (2007) | 1.26 in (2019) |
| September 16 | 91.0°F (2018) | 42.1°F (2000) | 1.16 in (1997) |
| September 17 | 91.0°F (2018) | 44.1°F (1999) | 1.02 in (2023) |
| September 18 | 88.0°F (2000) | 45.0°F (2012) | 2.27 in (2015) |
| September 19 | 91.0°F (2013) | 42.1°F (2012) | 0.69 in (2005) |
| September 20 | 93.9°F (2018) | 39.9°F (2006) | 0.96 in (2009) |
| September 21 | 93.0°F (2017) | 42.1°F (2000) | 0.86 in (2019) |
| September 22 | 93.0°F (2017) | 37.9°F (1999) | 1.45 in (2024) |
| September 23 | 93.0°F (2017) | 39.0°F (2012) | 0.62 in (2001) |
| September 24 | 91.0°F (2007) | 36.0°F (2012) | 0.73 in (2024) |
| September 25 | 91.0°F (2017) | 39.0°F (2001) | 0.50 in (2018) |
| September 26 | 93.0°F (1998) | 37.0°F (2000) | 1.46 in (2011) |
| September 27 | 87.1°F (1998) | 42.1°F (2001) | 4.45 in (2019) |
| September 28 | 84.9°F (2013) | 41.0°F (2006) | 2.63 in (1999) |
| September 29 | 88.0°F (2025) | 37.0°F (2003) | 0.68 in (2019) |
| September 30 | 87.1°F (2002) | 37.0°F (2004) | 0.24 in (2007) |