September weather in Derby, CT
The average temperature in Derby in September is 64.3°F (53.6°F–75.0°F). Average precipitation: 4.38 inches.
September is a fall month in Derby, and is warmer than the annual average of 50.2°F. Daily temperatures swing about 21.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
75.0°F
Avg Low
53.6°F
Precipitation
4.38 in
Daylight
12h 16m
September records in Derby
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2012) | 0.0°F (2013) | 1.36 in (1970) |
| September 2 | 88.0°F (2015) | 0.0°F (2013) | 3.89 in (2021) |
| September 3 | 90.0°F (2015) | 0.0°F (2013) | 2.07 in (2000) |
| September 4 | 91.0°F (2015) | 54.0°F (2017) | 3.73 in (1974) |
| September 5 | 88.0°F (2018) | 55.9°F (2011) | 0.70 in (1969) |
| September 6 | 84.0°F (2017) | 45.0°F (2013) | 4.10 in (2022) |
| September 7 | 90.0°F (2018) | 44.1°F (2013) | 2.97 in (2011) |
| September 8 | 90.0°F (2015) | 45.0°F (2017) | 1.43 in (1974) |
| September 9 | 95.0°F (2015) | 44.1°F (2013) | 1.56 in (2004) |
| September 10 | 89.1°F (2015) | 44.1°F (2013) | 1.61 in (1999) |
| September 11 | 86.0°F (2016) | 43.0°F (2012) | 3.04 in (1968) |
| September 12 | 93.9°F (2013) | 45.0°F (2012) | 2.40 in (1971) |
| September 13 | 87.1°F (2013) | 46.0°F (2012) | 2.00 in (1987) |
| September 14 | 82.9°F (2011) | 48.0°F (2014) | 1.56 in (1971) |
| September 15 | 90.0°F (2016) | 43.0°F (2013) | 1.81 in (1966) |
| September 16 | 81.0°F (2015) | 43.0°F (2014) | 1.17 in (2002) |
| September 17 | 84.0°F (2015) | 42.1°F (2013) | 4.60 in (1999) |
| September 18 | 86.0°F (2015) | 37.9°F (2013) | 1.39 in (2004) |
| September 19 | 84.9°F (2015) | 37.9°F (2013) | 2.81 in (1973) |
| September 20 | 90.0°F (2015) | 42.1°F (2013) | 1.70 in (2000) |
| September 21 | 78.1°F (2013) | 45.0°F (2013) | 0.96 in (1977) |
| September 22 | 82.0°F (2016) | 48.9°F (2015) | 2.48 in (1979) |
| September 23 | 84.0°F (2016) | 39.9°F (2014) | 3.17 in (1994) |
| September 24 | 86.0°F (2017) | 39.0°F (2013) | 1.72 in (2021) |
| September 25 | 91.0°F (2017) | 39.9°F (2012) | 1.82 in (1991) |
| September 26 | 89.1°F (2017) | 32.0°F (2016) | 6.08 in (2018) |
| September 27 | 91.9°F (2017) | 39.0°F (2016) | 1.75 in (1975) |
| September 28 | 87.1°F (2017) | 45.0°F (2013) | 1.34 in (2010) |
| September 29 | 82.0°F (2014) | 45.0°F (2017) | 2.60 in (2004) |
| September 30 | 81.0°F (2015) | 43.0°F (2013) | 2.25 in (2023) |