September weather in Stillwater, OK
The average temperature in Stillwater in September is 72.8°F (61.0°F–84.7°F). Average precipitation: 2.94 inches.
September is a fall month in Stillwater, and is warmer than the annual average of 60.2°F. Daily temperatures swing about 23.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 13m. For travel, September is a comfortable month to visit.
Avg High
84.7°F
Avg Low
61.0°F
Precipitation
2.94 in
Daylight
12h 13m
September records in Stillwater
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 104.4°F (2011) | 57.4°F (2017) | 0.25 in (2006) |
| September 2 | 102.9°F (2012) | 57.4°F (2007) | 1.03 in (2014) |
| September 3 | 104.7°F (2012) | 54.9°F (2010) | 0.42 in (2011) |
| September 4 | 102.9°F (2012) | 49.1°F (2010) | 1.84 in (2007) |
| September 5 | 102.2°F (2023) | 52.5°F (2011) | 0.54 in (2014) |
| September 6 | 100.2°F (2015) | 46.6°F (2011) | 2.43 in (2014) |
| September 7 | 101.1°F (2015) | 47.1°F (2011) | 0.57 in (2007) |
| September 8 | 97.3°F (2013) | 48.4°F (2011) | 1.98 in (2007) |
| September 9 | 94.6°F (2013) | 46.6°F (2004) | 1.37 in (2020) |
| September 10 | 94.3°F (2010) | 50.4°F (2004) | 0.69 in (2009) |
| September 11 | 95.4°F (2021) | 52.5°F (2022) | 1.63 in (2015) |
| September 12 | 99.5°F (2011) | 47.7°F (2022) | 1.80 in (2019) |
| September 13 | 100.0°F (2011) | 46.6°F (2006) | 1.50 in (2003) |
| September 14 | 94.8°F (2017) | 50.0°F (2006) | 1.80 in (2002) |
| September 15 | 94.1°F (2017) | 46.8°F (2008) | 0.91 in (2005) |
| September 16 | 95.9°F (2006) | 45.1°F (2008) | 0.44 in (2004) |
| September 17 | 96.6°F (2022) | 46.4°F (2008) | 0.58 in (2011) |
| September 18 | 98.4°F (2022) | 48.4°F (2006) | 1.50 in (2002) |
| September 19 | 100.6°F (2024) | 44.8°F (2003) | 0.37 in (2002) |
| September 20 | 100.8°F (2024) | 43.2°F (2003) | 0.33 in (2015) |
| September 21 | 100.8°F (2022) | 47.7°F (2013) | 0.85 in (2018) |
| September 22 | 95.5°F (2005) | 45.7°F (2021) | 2.52 in (2019) |
| September 23 | 94.5°F (2022) | 45.0°F (2021) | 0.17 in (2024) |
| September 24 | 93.4°F (2022) | 47.3°F (2009) | 0.38 in (2016) |
| September 25 | 96.3°F (2012) | 43.2°F (2006) | 0.67 in (2019) |
| September 26 | 93.9°F (2013) | 47.5°F (2018) | 2.36 in (2017) |
| September 27 | 95.4°F (2023) | 42.3°F (2010) | 0.40 in (2017) |
| September 28 | 95.9°F (2023) | 43.9°F (2003) | 1.52 in (2013) |
| September 29 | 95.4°F (2023) | 39.9°F (2020) | 0.56 in (2003) |
| September 30 | 95.2°F (2023) | 44.6°F (2008) | 0.54 in (2005) |