September weather in Aspen, CO
The average temperature in Aspen in September is 53.4°F (40.0°F–66.9°F). Average precipitation: 1.89 inches. Average snowfall is 1.0 inches.
September is a fall month in Aspen, and is warmer than the annual average of 40.6°F. Daily temperatures swing about 26.9°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
66.9°F
Avg Low
40.0°F
Precipitation
1.89 in
Snow
1.0 in
September records in Aspen
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 84.0°F (1985) | 34.0°F (1993) | 0.60 in (2007) |
| September 2 | 82.0°F (1995) | 35.1°F (1992) | 0.49 in (2016) |
| September 3 | 82.0°F (1990) | 33.1°F (1993) | 0.31 in (1981) |
| September 4 | 82.9°F (1998) | 36.0°F (2008) | 0.34 in (1985) |
| September 5 | 86.0°F (1995) | 33.1°F (1992) | 0.50 in (1982) |
| September 6 | 82.9°F (1998) | 36.0°F (2004) | 0.30 in (1991) |
| September 7 | 82.9°F (2002) | 32.0°F (2001) | 0.93 in (1986) |
| September 8 | 84.0°F (1998) | 32.0°F (1984) | 0.50 in (2003) |
| September 9 | 82.0°F (2022) | 25.0°F (2020) | 0.51 in (2020) |
| September 10 | 79.0°F (1998) | 25.0°F (2020) | 0.63 in (2014) |
| September 11 | 82.9°F (2021) | 32.0°F (1986) | 0.70 in (2003) |
| September 12 | 82.0°F (1990) | 28.9°F (1985) | 0.82 in (1988) |
| September 13 | 82.0°F (1990) | 30.0°F (1985) | 0.93 in (1993) |
| September 14 | 81.0°F (1990) | 26.1°F (1993) | 0.45 in (1991) |
| September 15 | 82.0°F (1990) | 27.0°F (1993) | 0.57 in (2023) |
| September 16 | 80.1°F (2000) | 28.0°F (1991) | 0.42 in (1990) |
| September 17 | 82.0°F (2000) | 24.1°F (2006) | 1.07 in (2007) |
| September 18 | 80.1°F (2000) | 25.0°F (2003) | 0.70 in (2002) |
| September 19 | 80.1°F (2018) | 21.9°F (1988) | 0.40 in (2002) |
| September 20 | 81.0°F (2010) | 23.0°F (1983) | 0.90 in (1985) |
| September 21 | 75.9°F (2005) | 27.0°F (1983) | 0.70 in (2006) |
| September 22 | 75.9°F (1987) | 21.9°F (1995) | 0.82 in (2000) |
| September 23 | 75.9°F (1987) | 21.9°F (1995) | 1.05 in (2013) |
| September 24 | 78.1°F (1987) | 24.1°F (1985) | 0.47 in (2016) |
| September 25 | 75.9°F (1998) | 21.9°F (2000) | 0.39 in (1999) |
| September 26 | 77.0°F (1998) | 21.9°F (2000) | 0.65 in (1986) |
| September 27 | 78.1°F (2014) | 18.0°F (1996) | 0.40 in (1990) |
| September 28 | 79.0°F (2001) | 18.0°F (1996) | 0.80 in (2005) |
| September 29 | 79.0°F (2009) | 19.0°F (1999) | 1.05 in (1985) |
| September 30 | 78.1°F (2010) | 21.0°F (1985) | 0.70 in (2004) |