September weather in Mammoth Lakes, CA
The average temperature in Mammoth Lakes in September is 55.5°F (39.8°F–71.3°F). Average precipitation: 0.47 inches.
September is a fall month in Mammoth Lakes, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 31.5°F between overnight low and afternoon high. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
71.3°F
Avg Low
39.8°F
Precipitation
0.47 in
Daylight
12h 14m
September records in Mammoth Lakes
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 81.0°F (1996) | 34.0°F (1999) | 0.12 in (2007) |
| September 2 | 82.9°F (2014) | 30.0°F (2008) | 0.00 in (1994) |
| September 3 | 82.0°F (2017) | 30.0°F (1999) | 0.00 in (1994) |
| September 4 | 81.0°F (2010) | 25.0°F (2004) | 0.21 in (2003) |
| September 5 | 78.1°F (1994) | 25.0°F (2004) | 0.19 in (2002) |
| September 6 | 81.0°F (2008) | 26.1°F (2000) | 0.06 in (2002) |
| September 7 | 80.1°F (2001) | 27.0°F (2000) | 0.21 in (2002) |
| September 8 | 81.0°F (2008) | 27.0°F (2002) | 0.00 in (1994) |
| September 9 | 80.1°F (2015) | 28.9°F (2002) | 0.07 in (2010) |
| September 10 | 81.0°F (2018) | 28.9°F (2010) | 0.05 in (1999) |
| September 11 | 82.0°F (2015) | 30.9°F (2002) | 0.23 in (2011) |
| September 12 | 82.0°F (2015) | 25.0°F (2005) | 0.51 in (2011) |
| September 13 | 79.0°F (2003) | 26.1°F (2005) | 0.22 in (2009) |
| September 14 | 80.1°F (1995) | 26.1°F (1994) | 0.01 in (2011) |
| September 15 | 80.1°F (1995) | 26.1°F (1996) | 0.41 in (2015) |
| September 16 | 77.0°F (1995) | 21.9°F (2006) | 0.19 in (2015) |
| September 17 | 78.1°F (2009) | 25.0°F (1996) | 0.00 in (1994) |
| September 18 | 79.0°F (2014) | 25.0°F (1996) | 0.00 in (1994) |
| September 19 | 80.1°F (2000) | 28.0°F (1996) | 0.21 in (1999) |
| September 20 | 82.0°F (2000) | 26.1°F (2004) | 0.02 in (2004) |
| September 21 | 78.1°F (2000) | 21.0°F (2004) | 0.79 in (2017) |
| September 22 | 78.1°F (2003) | 21.9°F (2004) | 0.24 in (2016) |
| September 23 | 78.1°F (2002) | 21.9°F (2004) | 1.33 in (1999) |
| September 24 | 78.1°F (2002) | 23.0°F (2017) | 0.05 in (1994) |
| September 25 | 78.1°F (2003) | 25.0°F (2005) | 0.15 in (2001) |
| September 26 | 80.1°F (1999) | 26.1°F (2017) | 0.02 in (2013) |
| September 27 | 80.1°F (1999) | 21.9°F (2013) | 0.31 in (2005) |
| September 28 | 81.0°F (2003) | 28.0°F (2005) | 0.01 in (1994) |
| September 29 | 81.0°F (2010) | 26.1°F (1995) | 0.99 in (1994) |
| September 30 | 81.0°F (2010) | 23.0°F (2009) | 0.12 in (2008) |