September weather in Jamestown, CO
The average temperature in Jamestown in September is °F (°F–°F). Average precipitation: 1.93 inches.
September is a fall month in Jamestown, and is cooler than the annual average of 0°F. Expect about 8 days with precipitation. Daylight averages about 12h 15m.
Avg High
°F
Avg Low
°F
Precipitation
1.93 in
Daylight
12h 15m
September records in Jamestown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 92.1°F (2005) | 24.4°F (2005) | 0.20 in (1981) |
| September 2 | 78.4°F (2019) | 16.5°F (2006) | 1.00 in (1990) |
| September 3 | 75.2°F (2002) | 14.7°F (2006) | 1.20 in (2023) |
| September 4 | 78.6°F (1995) | 26.4°F (2006) | 0.30 in (1984) |
| September 5 | 79.5°F (1998) | 27.0°F (1994) | 0.60 in (1981) |
| September 6 | 105.8°F (2005) | 23.9°F (2005) | 0.40 in (2011) |
| September 7 | 107.6°F (2005) | 26.6°F (2010) | 0.90 in (1989) |
| September 8 | 77.0°F (2022) | 16.5°F (2020) | 1.20 in (2001) |
| September 9 | 96.1°F (2005) | 16.9°F (2020) | 1.30 in (2013) |
| September 10 | 99.9°F (2005) | 23.4°F (2020) | 1.30 in (2013) |
| September 11 | 88.0°F (2006) | 20.1°F (2005) | 2.10 in (2013) |
| September 12 | 105.4°F (2005) | 19.4°F (2014) | 2.30 in (2013) |
| September 13 | 108.5°F (2006) | 15.3°F (2006) | 1.00 in (1993) |
| September 14 | 104.4°F (2005) | 16.7°F (1993) | 0.80 in (1981) |
| September 15 | 83.8°F (2006) | 25.7°F (1999) | 1.00 in (2013) |
| September 16 | 100.9°F (2005) | 23.9°F (2006) | 0.30 in (1987) |
| September 17 | 82.4°F (2006) | 9.0°F (2006) | 0.70 in (1996) |
| September 18 | 74.3°F (2018) | 21.7°F (2003) | 0.70 in (1996) |
| September 19 | 75.7°F (2010) | 21.7°F (1996) | 0.40 in (1997) |
| September 20 | 106.2°F (2005) | 18.3°F (1995) | 1.00 in (1995) |
| September 21 | 103.1°F (2006) | 11.1°F (1995) | 0.80 in (2004) |
| September 22 | 68.0°F (2007) | 7.5°F (1995) | 0.60 in (2006) |
| September 23 | 77.2°F (2005) | 16.9°F (2005) | 1.00 in (2025) |
| September 24 | 106.7°F (2006) | 12.9°F (2000) | 0.60 in (2017) |
| September 25 | 71.4°F (2001) | 12.7°F (2000) | 0.60 in (1996) |
| September 26 | 86.0°F (2006) | 16.3°F (1996) | 0.80 in (1996) |
| September 27 | 72.9°F (2001) | 11.7°F (1996) | 0.30 in (2005) |
| September 28 | 81.1°F (2005) | 13.3°F (1999) | 0.90 in (1985) |
| September 29 | 70.0°F (2024) | 28.6°F (1992) | 1.10 in (2025) |
| September 30 | 68.5°F (1992) | 19.9°F (2009) | 0.20 in (2022) |