September weather in Dayton, WY
The average temperature in Dayton in September is 56.8°F (40.3°F–73.2°F). Average precipitation: 1.55 inches. Average snowfall is 0.3 inches.
September is a fall month in Dayton, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 32.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.2°F
Avg Low
40.3°F
Precipitation
1.55 in
Snow
0.3 in
September records in Dayton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2022) | 34.0°F (2008) | 0.57 in (2008) |
| September 2 | 98.1°F (2024) | 33.1°F (2008) | 0.51 in (1953) |
| September 3 | 98.1°F (2015) | 34.0°F (2010) | 0.34 in (1999) |
| September 4 | 100.0°F (2022) | 30.9°F (2011) | 1.60 in (2023) |
| September 5 | 96.1°F (2022) | 28.9°F (2025) | 0.53 in (2016) |
| September 6 | 100.0°F (2020) | 34.0°F (2017) | 0.34 in (1993) |
| September 7 | 102.0°F (2022) | 30.0°F (2010) | 1.26 in (2020) |
| September 8 | 91.9°F (2024) | 25.0°F (2020) | 1.68 in (2022) |
| September 9 | 93.0°F (2024) | 24.1°F (2020) | 0.76 in (2002) |
| September 10 | 91.9°F (2012) | 28.9°F (2007) | 1.25 in (2014) |
| September 11 | 91.9°F (2021) | 30.9°F (2014) | 0.30 in (2014) |
| September 12 | 87.1°F (2017) | 19.0°F (2014) | 0.95 in (2019) |
| September 13 | 90.0°F (2017) | 27.0°F (2008) | 0.74 in (1998) |
| September 14 | 89.1°F (2015) | 27.0°F (2008) | 0.65 in (2013) |
| September 15 | 91.0°F (2020) | 32.0°F (2014) | 1.00 in (2017) |
| September 16 | 88.0°F (2012) | 28.9°F (2021) | 0.60 in (2017) |
| September 17 | 91.9°F (2019) | 28.9°F (2021) | 0.37 in (2007) |
| September 18 | 91.9°F (2021) | 30.0°F (2017) | 0.35 in (2002) |
| September 19 | 89.1°F (2009) | 30.0°F (2017) | 0.44 in (1997) |
| September 20 | 91.9°F (2022) | 33.1°F (2021) | 0.53 in (1995) |
| September 21 | 86.0°F (2020) | 28.0°F (2011) | 0.69 in (1998) |
| September 22 | 91.0°F (2007) | 27.0°F (2011) | 0.30 in (1997) |
| September 23 | 90.0°F (2020) | 28.0°F (2011) | 0.35 in (2016) |
| September 24 | 90.0°F (2025) | 28.0°F (2007) | 0.90 in (2016) |
| September 25 | 98.1°F (2024) | 28.9°F (2007) | 1.70 in (2016) |
| September 26 | 95.0°F (2024) | 25.0°F (2018) | 0.53 in (2013) |
| September 27 | 95.0°F (2015) | 25.0°F (2018) | 0.70 in (2013) |
| September 28 | 93.0°F (2025) | 30.0°F (2013) | 1.10 in (2018) |
| September 29 | 98.1°F (2024) | 27.0°F (2021) | 0.24 in (1954) |
| September 30 | 84.9°F (2025) | 26.1°F (2024) | 1.37 in (1995) |