September weather in American Falls, ID
The average temperature in American Falls in September is 61.5°F (46.2°F–76.9°F). Average precipitation: 0.81 inches.
September is a fall month in American Falls, and is warmer than the annual average of 48.7°F. Daily temperatures swing about 30.7°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
76.9°F
Avg Low
46.2°F
Precipitation
0.81 in
Daylight
12h 16m
September records in American Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2022) | 39.9°F (2020) | 0.14 in (2012) |
| September 2 | 93.9°F (2019) | 36.0°F (2008) | 0.31 in (2012) |
| September 3 | 97.0°F (2022) | 37.0°F (2010) | 0.87 in (2023) |
| September 4 | 96.1°F (2022) | 37.9°F (2014) | 0.60 in (2023) |
| September 5 | 95.0°F (2020) | 39.0°F (2008) | 0.04 in (2023) |
| September 6 | 95.0°F (2020) | 35.1°F (2015) | 0.26 in (2023) |
| September 7 | 95.0°F (2022) | 33.1°F (2010) | 0.16 in (2023) |
| September 8 | 91.0°F (2022) | 39.9°F (2009) | 0.31 in (2019) |
| September 9 | 90.0°F (2021) | 33.1°F (2020) | 0.17 in (2010) |
| September 10 | 91.0°F (2021) | 34.0°F (2016) | 0.12 in (2019) |
| September 11 | 86.0°F (2009) | 37.0°F (2022) | 0.07 in (2021) |
| September 12 | 87.1°F (2022) | 28.0°F (2014) | 0.03 in (2013) |
| September 13 | 87.1°F (2022) | 37.0°F (2012) | 0.05 in (2011) |
| September 14 | 88.0°F (2012) | 34.0°F (2012) | 0.18 in (2009) |
| September 15 | 88.0°F (2012) | 39.0°F (2016) | 0.45 in (2015) |
| September 16 | 87.1°F (2014) | 39.0°F (2008) | 0.30 in (2015) |
| September 17 | 90.0°F (2014) | 37.0°F (2017) | 0.85 in (2024) |
| September 18 | 88.0°F (2010) | 39.0°F (2019) | 0.07 in (2013) |
| September 19 | 87.1°F (2009) | 36.0°F (2013) | 0.31 in (2020) |
| September 20 | 86.0°F (2022) | 32.0°F (2013) | 0.22 in (2008) |
| September 21 | 84.0°F (2022) | 35.1°F (2009) | 0.82 in (2017) |
| September 22 | 84.0°F (2011) | 35.1°F (2021) | 0.70 in (2016) |
| September 23 | 87.1°F (2011) | 36.0°F (2017) | 0.45 in (2016) |
| September 24 | 87.1°F (2011) | 35.1°F (2008) | 0.12 in (2012) |
| September 25 | 90.0°F (2015) | 32.0°F (2018) | 0.01 in (2013) |
| September 26 | 90.0°F (2010) | 34.0°F (2013) | 0.00 in (2008) |
| September 27 | 89.1°F (2010) | 35.1°F (2017) | 0.98 in (2014) |
| September 28 | 90.0°F (2010) | 33.1°F (2009) | 0.17 in (2019) |
| September 29 | 88.0°F (2024) | 33.1°F (2008) | 0.50 in (2019) |
| September 30 | 89.1°F (2011) | 32.0°F (2021) | 0.42 in (2009) |