September weather in New Haven, IL
The average temperature in New Haven in September is 70.1°F (58.9°F–81.3°F). Average precipitation: 3.35 inches.
September is a fall month in New Haven, and is warmer than the annual average of 56.8°F. Daily temperatures swing about 22.4°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
81.3°F
Avg Low
58.9°F
Precipitation
3.35 in
Daylight
12h 14m
September records in New Haven
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2011) | 53.1°F (2009) | 1.77 in (2001) |
| September 2 | 100.9°F (2011) | 53.1°F (2009) | 3.10 in (2012) |
| September 3 | 100.0°F (2011) | 55.0°F (2017) | 1.35 in (2014) |
| September 4 | 95.0°F (2015) | 55.9°F (2021) | 0.28 in (2003) |
| September 5 | 95.0°F (2015) | 51.1°F (2024) | 1.20 in (2021) |
| September 6 | 93.9°F (2015) | 50.0°F (2017) | 0.45 in (2018) |
| September 7 | 98.1°F (2021) | 46.9°F (2017) | 1.10 in (2012) |
| September 8 | 91.9°F (2016) | 46.9°F (2025) | 1.70 in (2012) |
| September 9 | 93.0°F (2013) | 46.0°F (2024) | 2.10 in (2018) |
| September 10 | 93.9°F (2013) | 46.0°F (2024) | 0.53 in (2001) |
| September 11 | 93.0°F (2005) | 48.0°F (2024) | 1.49 in (2014) |
| September 12 | 93.9°F (2019) | 51.1°F (2022) | 0.89 in (2006) |
| September 13 | 93.9°F (2008) | 46.9°F (2014) | 1.30 in (2006) |
| September 14 | 99.0°F (2016) | 48.0°F (2013) | 0.10 in (2003) |
| September 15 | 91.9°F (2018) | 50.0°F (2014) | 1.04 in (1993) |
| September 16 | 95.0°F (2019) | 50.0°F (2011) | 2.12 in (1996) |
| September 17 | 93.9°F (2019) | 42.1°F (2014) | 1.00 in (2016) |
| September 18 | 93.0°F (2010) | 45.0°F (2012) | 0.56 in (2012) |
| September 19 | 91.0°F (2018) | 45.0°F (2012) | 2.30 in (2011) |
| September 20 | 96.1°F (2018) | 45.0°F (2020) | 1.23 in (2002) |
| September 21 | 96.1°F (2022) | 46.9°F (2020) | 1.73 in (2002) |
| September 22 | 96.1°F (2010) | 46.9°F (2012) | 1.57 in (2003) |
| September 23 | 93.0°F (2005) | 45.0°F (2012) | 3.92 in (2006) |
| September 24 | 91.0°F (2017) | 46.0°F (2012) | 3.08 in (2006) |
| September 25 | 91.9°F (2016) | 46.0°F (2014) | 1.32 in (2018) |
| September 26 | 93.0°F (2016) | 50.0°F (2021) | 2.00 in (2011) |
| September 27 | 88.0°F (2023) | 41.0°F (2022) | 1.88 in (2002) |
| September 28 | 91.0°F (2019) | 42.1°F (2022) | 3.34 in (1996) |
| September 29 | 93.9°F (2019) | 43.0°F (2022) | 0.60 in (2020) |
| September 30 | 96.1°F (2019) | 43.0°F (2022) | 0.87 in (2016) |