September weather in Letcher, SD
The average temperature in Letcher in September is 63.9°F (51.0°F–76.8°F). Average precipitation: 2.34 inches.
September is a fall month in Letcher, and is warmer than the annual average of 47.7°F. Daily temperatures swing about 25.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
76.8°F
Avg Low
51.0°F
Precipitation
2.34 in
Daylight
12h 17m
September records in Letcher
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (2022) | 50.0°F (2005) | 1.43 in (2006) |
| September 2 | 104.0°F (2023) | 48.0°F (2008) | 0.57 in (2008) |
| September 3 | 99.0°F (2023) | 42.1°F (2008) | 1.56 in (1999) |
| September 4 | 100.9°F (2023) | 45.0°F (2011) | 1.10 in (2016) |
| September 5 | 97.0°F (2003) | 44.1°F (2011) | 0.65 in (2004) |
| September 6 | 99.0°F (2002) | 41.0°F (2025) | 0.44 in (2016) |
| September 7 | 93.9°F (2002) | 35.1°F (2025) | 0.33 in (2001) |
| September 8 | 100.0°F (2022) | 39.0°F (2020) | 0.21 in (2009) |
| September 9 | 98.1°F (2005) | 37.9°F (2020) | 0.42 in (2019) |
| September 10 | 97.0°F (2005) | 39.9°F (2020) | 2.69 in (2003) |
| September 11 | 95.0°F (2005) | 39.0°F (2022) | 3.53 in (2019) |
| September 12 | 93.0°F (2017) | 42.1°F (2000) | 1.13 in (2019) |
| September 13 | 95.0°F (2017) | 37.0°F (2014) | 0.62 in (2001) |
| September 14 | 95.0°F (2022) | 34.0°F (2007) | 0.41 in (2001) |
| September 15 | 93.9°F (2018) | 30.2°F (2011) | 0.52 in (2001) |
| September 16 | 95.0°F (2021) | 41.0°F (2014) | 0.51 in (2021) |
| September 17 | 91.9°F (2019) | 37.9°F (2017) | 0.53 in (2018) |
| September 18 | 93.0°F (2013) | 33.1°F (2012) | 0.46 in (2018) |
| September 19 | 91.9°F (2023) | 36.0°F (2006) | 2.12 in (2018) |
| September 20 | 93.0°F (2007) | 30.2°F (2006) | 0.64 in (2004) |
| September 21 | 95.0°F (2005) | 34.0°F (2000) | 1.00 in (2006) |
| September 22 | 93.9°F (2017) | 31.1°F (2012) | 1.13 in (2004) |
| September 23 | 91.9°F (2007) | 27.1°F (2012) | 1.14 in (2017) |
| September 24 | 82.9°F (2012) | 28.0°F (2000) | 0.81 in (2015) |
| September 25 | 89.1°F (2008) | 32.0°F (2000) | 0.58 in (2005) |
| September 26 | 91.0°F (2008) | 34.0°F (2000) | 0.08 in (2003) |
| September 27 | 91.0°F (2021) | 35.1°F (2002) | 0.77 in (2013) |
| September 28 | 93.9°F (2021) | 33.1°F (2004) | 0.49 in (2013) |
| September 29 | 91.9°F (2024) | 32.0°F (2009) | 0.53 in (2007) |
| September 30 | 89.1°F (2023) | 30.9°F (2003) | 0.47 in (2007) |