September weather in Troy, ID
The average temperature in Troy in September is °F (°F–°F). Average precipitation: 1.30 inches.
September is a fall month in Troy, and is cooler than the annual average of 0°F. Expect about 6 days with precipitation. Daylight averages about 12h 19m.
Avg High
°F
Avg Low
°F
Precipitation
1.30 in
Daylight
12h 19m
September records in Troy
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.6°F (2025) | 39.4°F (2008) | 0.50 in (2010) |
| September 2 | 93.6°F (2025) | 40.6°F (2008) | 0.10 in (2003) |
| September 3 | 88.3°F (2025) | 41.2°F (2015) | 0.10 in (2008) |
| September 4 | 86.5°F (2017) | 41.4°F (2015) | 0.10 in (2013) |
| September 5 | 84.9°F (2006) | 37.9°F (2010) | 0.90 in (2015) |
| September 6 | 89.4°F (2003) | 38.8°F (2015) | 0.30 in (2019) |
| September 7 | 84.7°F (2024) | 39.9°F (2001) | 0.20 in (2016) |
| September 8 | 85.3°F (2011) | 37.2°F (2002) | 1.50 in (2003) |
| September 9 | 81.5°F (2011) | 38.3°F (2003) | 0.20 in (2003) |
| September 10 | 84.6°F (2011) | 37.9°F (2014) | 0.30 in (2021) |
| September 11 | 84.7°F (2013) | 36.7°F (2014) | 0.20 in (2003) |
| September 12 | 83.7°F (2013) | 39.6°F (2016) | 0.90 in (2024) |
| September 13 | 78.3°F (2013) | 38.3°F (2016) | 0.30 in (2004) |
| September 14 | 86.4°F (2002) | 37.4°F (2006) | 0.10 in (2018) |
| September 15 | 83.5°F (2013) | 37.8°F (2015) | 0.50 in (2004) |
| September 16 | 84.2°F (2009) | 36.5°F (2003) | 0.30 in (2010) |
| September 17 | 83.5°F (2008) | 36.0°F (2003) | 0.40 in (2016) |
| September 18 | 78.6°F (2025) | 33.6°F (2004) | 0.40 in (2017) |
| September 19 | 82.8°F (2008) | 33.8°F (2004) | 0.90 in (2017) |
| September 20 | 77.2°F (2012) | 30.9°F (2004) | 0.50 in (2017) |
| September 21 | 81.0°F (2014) | 35.6°F (2017) | 0.40 in (2006) |
| September 22 | 77.7°F (2011) | 35.1°F (2017) | 0.70 in (2022) |
| September 23 | 84.6°F (2001) | 33.8°F (2008) | 0.40 in (2010) |
| September 24 | 86.9°F (2011) | 38.3°F (2013) | 0.70 in (2013) |
| September 25 | 75.9°F (2010) | 37.4°F (2013) | 0.30 in (2013) |
| September 26 | 78.6°F (2022) | 36.9°F (2013) | 0.20 in (2023) |
| September 27 | 82.2°F (2022) | 38.5°F (2013) | 0.20 in (2023) |
| September 28 | 80.8°F (2024) | 30.7°F (2019) | 0.90 in (2013) |
| September 29 | 76.8°F (2006) | 28.8°F (2019) | 1.60 in (2022) |
| September 30 | 80.2°F (2008) | 28.8°F (2019) | 0.70 in (2005) |