September weather in Challis, ID
The average temperature in Challis in September is 58.2°F (42.0°F–74.5°F). Average precipitation: 0.85 inches.
September is a fall month in Challis, and is warmer than the annual average of 44.4°F. Daily temperatures swing about 32.5°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
74.5°F
Avg Low
42.0°F
Precipitation
0.85 in
Daylight
12h 17m
September records in Challis
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2019) | 35.1°F (2006) | 0.48 in (2000) |
| September 2 | 93.0°F (2007) | 30.2°F (2008) | 0.14 in (2000) |
| September 3 | 99.0°F (2022) | 35.1°F (2004) | 0.52 in (2023) |
| September 4 | 97.0°F (2022) | 34.0°F (2004) | 0.47 in (2015) |
| September 5 | 98.1°F (2020) | 34.0°F (2008) | 0.27 in (2001) |
| September 6 | 99.0°F (2022) | 29.1°F (2010) | 0.88 in (2001) |
| September 7 | 97.0°F (2022) | 34.0°F (2010) | 0.13 in (2025) |
| September 8 | 96.1°F (2021) | 32.0°F (2001) | 0.22 in (2019) |
| September 9 | 93.9°F (2021) | 32.0°F (2020) | 1.09 in (2010) |
| September 10 | 86.0°F (2024) | 32.0°F (2007) | 0.08 in (2005) |
| September 11 | 88.0°F (2015) | 28.0°F (2005) | 0.01 in (2024) |
| September 12 | 89.1°F (2015) | 28.2°F (2014) | 0.12 in (2004) |
| September 13 | 89.1°F (2015) | 27.1°F (2016) | 0.30 in (2001) |
| September 14 | 89.1°F (2000) | 32.0°F (2003) | 0.14 in (2016) |
| September 15 | 91.0°F (2000) | 34.0°F (2006) | 0.87 in (2001) |
| September 16 | 88.0°F (2000) | 33.1°F (2006) | 0.21 in (2015) |
| September 17 | 84.0°F (2009) | 27.1°F (2006) | 0.39 in (2005) |
| September 18 | 86.0°F (2009) | 27.0°F (2003) | 0.18 in (2017) |
| September 19 | 89.1°F (2009) | 31.1°F (2013) | 0.29 in (2004) |
| September 20 | 82.9°F (2014) | 33.1°F (2003) | 0.33 in (2008) |
| September 21 | 82.0°F (1999) | 30.0°F (2004) | 0.40 in (2023) |
| September 22 | 84.0°F (2015) | 30.0°F (2002) | 0.14 in (2014) |
| September 23 | 86.0°F (2009) | 28.0°F (2000) | 0.24 in (2007) |
| September 24 | 87.1°F (2009) | 23.0°F (2000) | 0.23 in (2005) |
| September 25 | 89.1°F (2024) | 27.1°F (2018) | 0.75 in (2013) |
| September 26 | 87.1°F (2021) | 30.0°F (2000) | 0.42 in (2014) |
| September 27 | 84.9°F (2021) | 25.0°F (1999) | 0.20 in (2014) |
| September 28 | 89.1°F (2024) | 19.0°F (1999) | 0.15 in (2014) |
| September 29 | 82.9°F (2024) | 25.0°F (1999) | 0.19 in (2009) |
| September 30 | 86.0°F (2011) | 24.3°F (2007) | 0.35 in (2025) |