September weather in Lone Tree, CO
The average temperature in Lone Tree in September is 62.8°F (48.6°F–77.1°F). Average precipitation: 1.29 inches.
September is a fall month in Lone Tree, and is warmer than the annual average of 50.2°F. Daily temperatures swing about 28.5°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
77.1°F
Avg Low
48.6°F
Precipitation
1.29 in
Daylight
12h 15m
September records in Lone Tree
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2019) | 46.0°F (2006) | 0.12 in (1999) |
| September 2 | 98.1°F (2019) | 46.0°F (2006) | 0.38 in (2022) |
| September 3 | 93.9°F (2017) | 41.0°F (2006) | 1.62 in (2021) |
| September 4 | 93.9°F (2019) | 43.0°F (2006) | 0.59 in (2024) |
| September 5 | 97.0°F (2019) | 43.0°F (2004) | 0.60 in (2009) |
| September 6 | 96.1°F (2020) | 43.0°F (2004) | 0.42 in (2019) |
| September 7 | 93.9°F (2022) | 41.0°F (2001) | 0.15 in (2003) |
| September 8 | 95.0°F (2022) | 30.2°F (2020) | 0.65 in (2001) |
| September 9 | 91.0°F (2021) | 30.2°F (2020) | 0.21 in (2014) |
| September 10 | 93.9°F (2021) | 37.0°F (2020) | 1.02 in (2013) |
| September 11 | 93.0°F (2021) | 35.1°F (2014) | 0.77 in (2013) |
| September 12 | 91.0°F (2018) | 32.0°F (2014) | 2.20 in (2013) |
| September 13 | 93.0°F (2018) | 35.1°F (1999) | 0.56 in (2013) |
| September 14 | 90.0°F (2018) | 32.0°F (2003) | 0.82 in (2013) |
| September 15 | 91.0°F (2000) | 37.0°F (2003) | 0.12 in (2013) |
| September 16 | 91.0°F (2000) | 41.0°F (1999) | 0.14 in (2025) |
| September 17 | 91.0°F (2000) | 31.1°F (2006) | 0.14 in (2011) |
| September 18 | 91.0°F (2018) | 32.0°F (2006) | 0.84 in (2002) |
| September 19 | 93.0°F (2010) | 33.1°F (2003) | 0.27 in (1999) |
| September 20 | 89.1°F (2010) | 37.9°F (1999) | 0.22 in (2000) |
| September 21 | 87.1°F (2017) | 34.0°F (2009) | 0.61 in (2004) |
| September 22 | 84.9°F (2018) | 32.0°F (2000) | 0.38 in (2013) |
| September 23 | 86.0°F (2003) | 30.9°F (2000) | 0.85 in (2013) |
| September 24 | 87.1°F (2020) | 28.9°F (2000) | 0.20 in (2000) |
| September 25 | 89.1°F (1998) | 28.0°F (2000) | 0.48 in (2012) |
| September 26 | 89.1°F (2019) | 34.0°F (2000) | 0.56 in (2012) |
| September 27 | 87.1°F (2015) | 35.1°F (2000) | 0.25 in (2013) |
| September 28 | 88.0°F (2010) | 28.0°F (1999) | 0.42 in (2017) |
| September 29 | 89.1°F (2024) | 26.1°F (1999) | 0.66 in (2014) |
| September 30 | 87.1°F (2023) | 37.0°F (1999) | 0.38 in (2022) |