September weather in Pleasanton, CA
The average temperature in Pleasanton in September is 70.2°F (54.9°F–85.4°F). Average precipitation: 0.08 inches.
September is a fall month in Pleasanton, and is warmer than the annual average of 59.9°F. Daily temperatures swing about 30.5°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
85.4°F
Avg Low
54.9°F
Precipitation
0.08 in
Daylight
12h 14m
September records in Pleasanton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.0°F (2017) | 48.0°F (1999) | 0.08 in (2000) |
| September 2 | 108.0°F (2017) | 51.1°F (2012) | 0.01 in (2013) |
| September 3 | 106.0°F (2017) | 50.0°F (2000) | 0.00 in (1998) |
| September 4 | 106.0°F (2022) | 51.1°F (2005) | 0.00 in (1998) |
| September 5 | 113.0°F (2022) | 46.0°F (2000) | 0.00 in (1998) |
| September 6 | 113.0°F (2022) | 48.0°F (2000) | 0.00 in (1998) |
| September 7 | 111.9°F (2020) | 48.9°F (2003) | 0.00 in (1998) |
| September 8 | 111.9°F (2022) | 46.0°F (2002) | 0.10 in (1998) |
| September 9 | 107.1°F (2015) | 48.9°F (2000) | 0.00 in (1998) |
| September 10 | 108.0°F (2015) | 46.9°F (2000) | 0.02 in (2025) |
| September 11 | 105.1°F (2015) | 50.0°F (2000) | 0.00 in (1998) |
| September 12 | 102.0°F (2006) | 46.9°F (2005) | 0.05 in (2009) |
| September 13 | 100.0°F (2019) | 48.0°F (2016) | 0.13 in (2009) |
| September 14 | 98.1°F (2019) | 48.9°F (2018) | 0.01 in (2009) |
| September 15 | 95.0°F (2004) | 51.1°F (2010) | 0.00 in (1998) |
| September 16 | 97.0°F (2025) | 46.0°F (2006) | 0.18 in (2019) |
| September 17 | 99.0°F (2025) | 48.0°F (2006) | 0.00 in (1998) |
| September 18 | 100.9°F (2000) | 46.0°F (2005) | 0.31 in (2022) |
| September 19 | 102.9°F (2000) | 48.0°F (2018) | 0.17 in (2022) |
| September 20 | 102.0°F (2015) | 45.0°F (2004) | 0.21 in (2005) |
| September 21 | 102.9°F (2015) | 44.1°F (2004) | 0.46 in (2013) |
| September 22 | 102.0°F (2003) | 46.9°F (2004) | 0.23 in (2007) |
| September 23 | 100.9°F (2011) | 45.0°F (2017) | 0.00 in (1998) |
| September 24 | 102.0°F (2024) | 46.9°F (2007) | 0.10 in (2025) |
| September 25 | 99.0°F (2009) | 46.0°F (2007) | 0.21 in (2014) |
| September 26 | 102.9°F (2009) | 46.9°F (2004) | 0.16 in (1998) |
| September 27 | 102.0°F (2009) | 48.9°F (2013) | 0.01 in (1998) |
| September 28 | 105.1°F (2010) | 50.0°F (2001) | 0.00 in (1998) |
| September 29 | 102.0°F (2010) | 44.1°F (2007) | 0.00 in (1998) |
| September 30 | 100.9°F (2020) | 42.1°F (2007) | 0.05 in (2023) |