September weather in Manhattan, MT
The average temperature in Manhattan in September is 55.9°F (38.9°F–72.9°F). Average precipitation: 1.38 inches.
September is a fall month in Manhattan, and is warmer than the annual average of 42.7°F. Daily temperatures swing about 34°F between overnight low and afternoon high. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
72.9°F
Avg Low
38.9°F
Precipitation
1.38 in
Daylight
12h 18m
September records in Manhattan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2022) | 37.0°F (2021) | 0.50 in (2012) |
| September 2 | 95.0°F (2024) | 32.0°F (2011) | 0.75 in (2014) |
| September 3 | 91.9°F (2015) | 30.9°F (2011) | 0.02 in (2016) |
| September 4 | 99.0°F (2022) | 28.9°F (2011) | 0.23 in (2024) |
| September 5 | 96.1°F (2019) | 28.9°F (2011) | 0.55 in (2023) |
| September 6 | 93.9°F (2022) | 32.0°F (2008) | 0.65 in (2016) |
| September 7 | 91.9°F (2022) | 33.1°F (2014) | 0.65 in (2019) |
| September 8 | 97.0°F (2022) | 32.0°F (2015) | 0.28 in (2010) |
| September 9 | 90.0°F (2012) | 30.9°F (2020) | 0.22 in (2010) |
| September 10 | 88.0°F (2017) | 28.9°F (2009) | 0.44 in (2010) |
| September 11 | 89.1°F (2021) | 28.9°F (2009) | 0.22 in (2014) |
| September 12 | 88.0°F (2011) | 24.1°F (2014) | 0.06 in (2016) |
| September 13 | 91.0°F (2017) | 25.0°F (2014) | 0.40 in (2024) |
| September 14 | 89.1°F (2015) | 30.0°F (2012) | 0.20 in (2017) |
| September 15 | 87.1°F (2012) | 28.0°F (2008) | 0.52 in (2017) |
| September 16 | 90.0°F (2019) | 28.0°F (2008) | 0.60 in (2015) |
| September 17 | 89.1°F (2009) | 33.1°F (2008) | 0.44 in (2022) |
| September 18 | 89.1°F (2009) | 27.0°F (2021) | 1.18 in (2024) |
| September 19 | 86.0°F (2009) | 35.1°F (2012) | 0.46 in (2013) |
| September 20 | 91.0°F (2009) | 30.0°F (2011) | 0.08 in (2020) |
| September 21 | 84.9°F (2025) | 28.9°F (2009) | 0.38 in (2019) |
| September 22 | 84.0°F (2012) | 27.0°F (2011) | 0.75 in (2016) |
| September 23 | 84.9°F (2011) | 30.9°F (2009) | 0.38 in (2023) |
| September 24 | 89.1°F (2011) | 33.1°F (2009) | 0.21 in (2018) |
| September 25 | 89.1°F (2011) | 33.1°F (2018) | 0.25 in (2013) |
| September 26 | 91.9°F (2014) | 28.0°F (2018) | 0.45 in (2013) |
| September 27 | 88.0°F (2009) | 28.0°F (2018) | 0.60 in (2014) |
| September 28 | 84.0°F (2022) | 28.0°F (2009) | 0.03 in (2019) |
| September 29 | 84.9°F (2022) | 27.0°F (2020) | 0.45 in (2014) |
| September 30 | 90.0°F (2024) | 26.1°F (2020) | 0.25 in (2014) |