September weather in Waterbury, CT
The average temperature in Waterbury in September is °F (°F–°F). Average precipitation: 4.60 inches.
September is a fall month in Waterbury, and is cooler than the annual average of 0°F. Daylight averages about 12h 16m.
Avg High
°F
Avg Low
°F
Precipitation
4.60 in
Daylight
12h 16m
September records in Waterbury
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2015) | 50.0°F (2012) | 0.70 in (2014) |
| September 2 | 88.0°F (2012) | 52.0°F (2016) | 5.75 in (2021) |
| September 3 | 90.0°F (2014) | 52.0°F (2016) | 0.68 in (2020) |
| September 4 | 90.0°F (2015) | 50.0°F (2016) | 0.41 in (2017) |
| September 5 | 86.0°F (2011) | 50.0°F (2016) | 2.17 in (2022) |
| September 6 | 88.0°F (2014) | 41.0°F (2013) | 2.96 in (2022) |
| September 7 | 91.0°F (2014) | 41.0°F (2013) | 1.59 in (2025) |
| September 8 | 91.0°F (2015) | 41.0°F (2013) | 3.48 in (2011) |
| September 9 | 95.0°F (2015) | 41.0°F (2013) | 0.97 in (2012) |
| September 10 | 93.0°F (2015) | 41.0°F (2013) | 1.04 in (2023) |
| September 11 | 91.0°F (2016) | 39.0°F (2012) | 1.50 in (2018) |
| September 12 | 93.0°F (2013) | 39.0°F (2012) | 1.88 in (2023) |
| September 13 | 90.0°F (2013) | 43.0°F (2012) | 3.12 in (2018) |
| September 14 | 84.0°F (2016) | 45.0°F (2014) | 1.37 in (2023) |
| September 15 | 90.0°F (2016) | 41.0°F (2013) | 0.24 in (2019) |
| September 16 | 79.0°F (2015) | 41.0°F (2011) | 0.06 in (2021) |
| September 17 | 84.0°F (2015) | 34.0°F (2013) | 0.08 in (2014) |
| September 18 | 84.0°F (2015) | 36.0°F (2013) | 0.36 in (2023) |
| September 19 | 84.0°F (2015) | 36.0°F (2013) | 0.67 in (2023) |
| September 20 | 84.0°F (2015) | 37.0°F (2013) | 0.20 in (2016) |
| September 21 | 84.0°F (2016) | 41.0°F (2012) | 0.36 in (2014) |
| September 22 | 82.0°F (2016) | 41.0°F (2012) | 0.71 in (2013) |
| September 23 | 84.0°F (2016) | 39.0°F (2013) | 1.00 in (2022) |
| September 24 | 84.9°F (2016) | 37.0°F (2013) | 1.62 in (2011) |
| September 25 | 82.0°F (2011) | 36.0°F (2012) | 1.41 in (2023) |
| September 26 | 81.0°F (2011) | 34.0°F (2016) | 1.86 in (2018) |
| September 27 | 84.0°F (2011) | 34.0°F (2016) | 0.72 in (2018) |
| September 28 | 81.0°F (2014) | 37.0°F (2015) | 0.64 in (2018) |
| September 29 | 82.0°F (2014) | 41.0°F (2013) | 1.02 in (2011) |
| September 30 | 84.0°F (2015) | 39.0°F (2013) | 3.45 in (2023) |