September weather in San Luis, CO
The average temperature in San Luis in September is 56.5°F (39.4°F–73.6°F). Average precipitation: 1.04 inches.
September is a fall month in San Luis, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 34.2°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 12h 13m. For travel, September is a comfortable month to visit.
Avg High
73.6°F
Avg Low
39.4°F
Precipitation
1.04 in
Daylight
12h 13m
September records in San Luis
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 84.0°F (1985) | 34.0°F (1980) | 0.33 in (1998) |
| September 2 | 82.0°F (1983) | 34.0°F (1980) | 0.06 in (1985) |
| September 3 | 82.9°F (1995) | 33.1°F (1980) | 0.47 in (1985) |
| September 4 | 84.9°F (1995) | 32.0°F (1980) | 0.38 in (1981) |
| September 5 | 84.0°F (1995) | 34.0°F (1988) | 0.24 in (1989) |
| September 6 | 82.0°F (2002) | 32.0°F (1985) | 0.08 in (1991) |
| September 7 | 87.1°F (2002) | 33.1°F (1985) | 0.25 in (1995) |
| September 8 | 82.0°F (1998) | 33.1°F (1987) | 0.36 in (1995) |
| September 9 | 80.1°F (1998) | 27.0°F (2001) | 0.38 in (2000) |
| September 10 | 79.0°F (1983) | 27.0°F (2001) | 1.58 in (2003) |
| September 11 | 80.1°F (2001) | 28.0°F (1987) | 0.25 in (1988) |
| September 12 | 79.0°F (2005) | 30.0°F (1987) | 0.45 in (1985) |
| September 13 | 84.0°F (2001) | 25.0°F (1985) | 0.41 in (1988) |
| September 14 | 82.0°F (1990) | 25.0°F (1985) | 0.32 in (1988) |
| September 15 | 80.1°F (2000) | 25.0°F (1987) | 0.70 in (1999) |
| September 16 | 81.0°F (2000) | 25.0°F (1987) | 0.25 in (1997) |
| September 17 | 82.0°F (2000) | 28.9°F (1980) | 0.45 in (1982) |
| September 18 | 81.0°F (2000) | 28.0°F (1987) | 0.35 in (1984) |
| September 19 | 82.0°F (2004) | 26.1°F (1988) | 0.54 in (2002) |
| September 20 | 79.0°F (1997) | 23.0°F (2002) | 0.46 in (1989) |
| September 21 | 82.0°F (2005) | 17.1°F (1983) | 1.10 in (1997) |
| September 22 | 81.0°F (2005) | 23.0°F (1983) | 0.38 in (1995) |
| September 23 | 78.1°F (1981) | 23.0°F (1985) | 0.41 in (1985) |
| September 24 | 79.0°F (2001) | 23.0°F (1985) | 0.19 in (1981) |
| September 25 | 79.0°F (1998) | 19.0°F (2000) | 0.80 in (1995) |
| September 26 | 80.1°F (2001) | 19.9°F (1985) | 0.11 in (1983) |
| September 27 | 79.0°F (2001) | 19.9°F (1985) | 0.08 in (1984) |
| September 28 | 80.1°F (1998) | 19.9°F (1999) | 0.41 in (2002) |
| September 29 | 79.0°F (1998) | 16.0°F (1999) | 0.70 in (1990) |
| September 30 | 78.1°F (2001) | 17.1°F (1999) | 0.65 in (1998) |