September weather in Denver, CO
The average temperature in Denver in September is 64.2°F (48.2°F–80.1°F). Average precipitation: 1.51 inches. Average snowfall is 0.8 inches.
September is a fall month in Denver, and is warmer than the annual average of 51.4°F. Daily temperatures swing about 31.9°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
80.1°F
Avg Low
48.2°F
Precipitation
1.51 in
Snow
0.8 in
September records in Denver
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1995) | 44.1°F (1962) | 0.40 in (1985) |
| September 2 | 97.0°F (2019) | 39.9°F (1952) | 0.73 in (1961) |
| September 3 | 98.1°F (2019) | 33.1°F (1961) | 1.00 in (1961) |
| September 4 | 98.1°F (2017) | 39.9°F (1961) | 0.50 in (2023) |
| September 5 | 96.1°F (2017) | 37.9°F (1962) | 0.54 in (2014) |
| September 6 | 99.0°F (2020) | 39.9°F (2011) | 0.13 in (1986) |
| September 7 | 97.0°F (2002) | 44.1°F (1956) | 1.22 in (1972) |
| September 8 | 98.1°F (2022) | 30.9°F (1962) | 0.56 in (1950) |
| September 9 | 99.0°F (2022) | 30.9°F (1962) | 1.30 in (1969) |
| September 10 | 98.1°F (2021) | 32.0°F (2020) | 0.41 in (1989) |
| September 11 | 96.1°F (2021) | 36.0°F (1974) | 1.20 in (2013) |
| September 12 | 93.0°F (1958) | 33.1°F (1989) | 3.88 in (2013) |
| September 13 | 96.1°F (1990) | 33.1°F (1993) | 6.47 in (2013) |
| September 14 | 95.0°F (2018) | 32.0°F (1993) | 0.39 in (1987) |
| September 15 | 91.0°F (2015) | 34.0°F (2003) | 0.89 in (1958) |
| September 16 | 93.9°F (2021) | 30.0°F (1965) | 0.75 in (2013) |
| September 17 | 95.0°F (2018) | 30.0°F (1965) | 1.17 in (1971) |
| September 18 | 93.9°F (2000) | 23.0°F (1971) | 1.08 in (1993) |
| September 19 | 93.0°F (1980) | 19.9°F (1971) | 1.31 in (1955) |
| September 20 | 93.9°F (2010) | 28.0°F (1983) | 0.97 in (1965) |
| September 21 | 93.0°F (2010) | 28.0°F (1983) | 0.90 in (1970) |
| September 22 | 91.9°F (2017) | 28.9°F (1995) | 0.70 in (2024) |
| September 23 | 89.1°F (1992) | 32.0°F (1985) | 0.82 in (2013) |
| September 24 | 90.0°F (2016) | 30.0°F (2000) | 1.10 in (2025) |
| September 25 | 91.0°F (1998) | 28.9°F (1961) | 0.31 in (2009) |
| September 26 | 90.0°F (2014) | 30.0°F (1985) | 0.43 in (1967) |
| September 27 | 91.9°F (1953) | 28.0°F (1996) | 0.55 in (2012) |
| September 28 | 89.1°F (1994) | 21.0°F (1985) | 1.44 in (1973) |
| September 29 | 91.0°F (1994) | 17.1°F (1985) | 0.96 in (1959) |
| September 30 | 91.0°F (2024) | 25.0°F (1985) | 1.04 in (2014) |