September weather in Shelby, MT
The average temperature in Shelby in September is 55.7°F (40.5°F–70.9°F). Average precipitation: 1.01 inches. Average snowfall is 0.5 inches.
September is a fall month in Shelby, and is warmer than the annual average of 42.2°F. Daily temperatures swing about 30.4°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
70.9°F
Avg Low
40.5°F
Precipitation
1.01 in
Snow
0.5 in
September records in Shelby
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (1998) | 37.0°F (1951) | 0.96 in (2008) |
| September 2 | 96.1°F (1998) | 30.0°F (2008) | 0.23 in (1951) |
| September 3 | 96.1°F (1950) | 33.1°F (2011) | 0.09 in (2002) |
| September 4 | 96.1°F (2022) | 34.0°F (1953) | 0.42 in (2002) |
| September 5 | 95.0°F (1950) | 25.0°F (1956) | 0.97 in (2015) |
| September 6 | 93.0°F (2020) | 27.0°F (1956) | 0.86 in (2002) |
| September 7 | 93.9°F (1998) | 19.0°F (2002) | 0.42 in (2020) |
| September 8 | 96.1°F (2022) | 26.1°F (2002) | 0.35 in (2007) |
| September 9 | 90.0°F (2024) | 32.0°F (2014) | 1.27 in (2013) |
| September 10 | 90.0°F (2017) | 28.9°F (1955) | 0.66 in (2010) |
| September 11 | 88.0°F (2011) | 30.0°F (1950) | 0.42 in (2005) |
| September 12 | 91.0°F (1953) | 21.9°F (2014) | 0.57 in (1954) |
| September 13 | 91.0°F (2015) | 26.1°F (2014) | 0.58 in (2024) |
| September 14 | 82.9°F (1998) | 28.0°F (2007) | 0.19 in (2006) |
| September 15 | 93.9°F (2000) | 28.0°F (1951) | 0.46 in (2017) |
| September 16 | 93.9°F (2000) | 25.0°F (1950) | 0.47 in (2017) |
| September 17 | 89.1°F (2002) | 30.9°F (1950) | 1.86 in (1996) |
| September 18 | 89.1°F (2002) | 21.9°F (2003) | 0.70 in (1957) |
| September 19 | 89.1°F (2009) | 16.0°F (1957) | 0.47 in (2007) |
| September 20 | 91.9°F (2009) | 17.1°F (1957) | 0.34 in (2011) |
| September 21 | 86.0°F (1999) | 19.9°F (1995) | 0.28 in (2000) |
| September 22 | 87.1°F (1997) | 26.1°F (2000) | 0.53 in (2016) |
| September 23 | 93.0°F (2014) | 18.0°F (2000) | 0.59 in (2007) |
| September 24 | 91.0°F (2009) | 24.1°F (2000) | 0.47 in (1951) |
| September 25 | 91.0°F (2011) | 16.0°F (1955) | 0.08 in (1998) |
| September 26 | 90.0°F (1952) | 19.0°F (1955) | 0.27 in (1999) |
| September 27 | 87.1°F (1957) | 28.0°F (1992) | 0.10 in (2018) |
| September 28 | 84.9°F (2022) | 23.0°F (1999) | 0.91 in (1954) |
| September 29 | 91.0°F (2001) | 24.1°F (1951) | 0.39 in (2019) |
| September 30 | 90.0°F (1992) | 19.9°F (2019) | 0.52 in (2019) |