September weather in Millbrook, NY
The average temperature in Millbrook in September is 62.0°F (50.4°F–73.6°F). Average precipitation: 4.61 inches.
September is a fall month in Millbrook, and is warmer than the annual average of 48.6°F. Daily temperatures swing about 23.2°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
73.6°F
Avg Low
50.4°F
Precipitation
4.61 in
Daylight
12h 16m
September records in Millbrook
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.7°F (2010) | 40.3°F (2017) | 5.25 in (2021) |
| September 2 | 92.3°F (2010) | 37.6°F (2017) | 1.32 in (2013) |
| September 3 | 89.4°F (2018) | 43.3°F (2024) | 0.59 in (2017) |
| September 4 | 88.5°F (2008) | 43.5°F (2024) | 1.03 in (2025) |
| September 5 | 88.9°F (2018) | 45.5°F (2013) | 2.22 in (2022) |
| September 6 | 90.9°F (2018) | 39.6°F (2013) | 2.59 in (2008) |
| September 7 | 91.2°F (2015) | 42.4°F (2013) | 1.41 in (2018) |
| September 8 | 94.5°F (2015) | 41.0°F (2025) | 2.25 in (2011) |
| September 9 | 92.7°F (2015) | 39.7°F (2017) | 2.92 in (2023) |
| September 10 | 87.1°F (2016) | 43.2°F (2017) | 1.16 in (2018) |
| September 11 | 92.1°F (2013) | 38.1°F (2012) | 1.28 in (2007) |
| September 12 | 90.3°F (2005) | 36.9°F (2006) | 1.60 in (2018) |
| September 13 | 89.6°F (2005) | 43.3°F (2007) | 0.45 in (2023) |
| September 14 | 88.9°F (2005) | 41.0°F (2014) | 0.72 in (2006) |
| September 15 | 84.7°F (2005) | 37.6°F (2013) | 1.30 in (2006) |
| September 16 | 83.8°F (2018) | 36.3°F (2007) | 0.47 in (2021) |
| September 17 | 83.3°F (2015) | 33.4°F (2007) | 0.19 in (2018) |
| September 18 | 83.3°F (2015) | 35.4°F (2013) | 3.21 in (2012) |
| September 19 | 82.4°F (2022) | 34.5°F (2020) | 0.18 in (2022) |
| September 20 | 81.5°F (2016) | 32.7°F (2020) | 0.17 in (2011) |
| September 21 | 82.8°F (2005) | 29.5°F (2020) | 0.65 in (2013) |
| September 22 | 87.4°F (2019) | 29.1°F (2020) | 1.22 in (2022) |
| September 23 | 90.9°F (2019) | 35.6°F (2014) | 1.04 in (2021) |
| September 24 | 88.7°F (2017) | 34.3°F (2013) | 1.30 in (2021) |
| September 25 | 89.4°F (2017) | 35.8°F (2016) | 2.42 in (2023) |
| September 26 | 88.7°F (2007) | 32.5°F (2016) | 0.74 in (2008) |
| September 27 | 87.4°F (2017) | 36.9°F (2023) | 0.65 in (2009) |
| September 28 | 84.2°F (2025) | 36.7°F (2005) | 0.97 in (2012) |
| September 29 | 81.9°F (2015) | 37.6°F (2006) | 3.22 in (2011) |
| September 30 | 76.1°F (2025) | 33.8°F (2006) | 2.83 in (2015) |