September weather in Hayward, CA
The average temperature in Hayward in September is 67.3°F (57.6°F–77.0°F). Average precipitation: 0.08 inches.
September is a fall month in Hayward, and is warmer than the annual average of 59.7°F. Daily temperatures swing about 19.4°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is one of the best months of the year to visit.
Avg High
77.0°F
Avg Low
57.6°F
Precipitation
0.08 in
Daylight
12h 14m
September records in Hayward
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (2017) | 53.1°F (1999) | 0.31 in (2000) |
| September 2 | 108.0°F (2017) | 52.0°F (2012) | 0.00 in (1999) |
| September 3 | 95.0°F (2017) | 54.0°F (2012) | 0.00 in (1999) |
| September 4 | 98.1°F (2008) | 52.0°F (2012) | 0.00 in (1999) |
| September 5 | 102.0°F (2022) | 52.0°F (2015) | 0.00 in (1999) |
| September 6 | 107.1°F (2022) | 52.0°F (2001) | 0.00 in (1999) |
| September 7 | 102.9°F (2020) | 54.0°F (2012) | 0.00 in (1999) |
| September 8 | 100.0°F (2022) | 53.1°F (2002) | 0.22 in (1999) |
| September 9 | 93.9°F (2015) | 54.0°F (2012) | 0.02 in (2025) |
| September 10 | 93.9°F (2017) | 52.0°F (2000) | 0.03 in (2025) |
| September 11 | 91.0°F (2003) | 53.1°F (2012) | 0.00 in (1999) |
| September 12 | 93.9°F (2003) | 54.0°F (2010) | 0.02 in (2009) |
| September 13 | 96.1°F (2019) | 55.0°F (2002) | 0.45 in (2009) |
| September 14 | 82.9°F (2004) | 54.0°F (2010) | 0.00 in (1999) |
| September 15 | 87.1°F (2004) | 53.1°F (2006) | 0.00 in (1999) |
| September 16 | 82.0°F (2014) | 51.1°F (2006) | 0.04 in (1999) |
| September 17 | 91.0°F (2000) | 53.1°F (2006) | 0.00 in (1999) |
| September 18 | 93.0°F (2000) | 51.1°F (2008) | 0.21 in (2022) |
| September 19 | 96.1°F (2000) | 50.0°F (2013) | 0.14 in (2004) |
| September 20 | 96.1°F (2015) | 52.0°F (2007) | 0.01 in (2005) |
| September 21 | 97.0°F (2003) | 53.1°F (2004) | 0.22 in (2013) |
| September 22 | 91.0°F (2003) | 50.0°F (2013) | 0.19 in (2007) |
| September 23 | 95.0°F (2025) | 51.1°F (2017) | 0.00 in (1998) |
| September 24 | 91.0°F (2019) | 51.1°F (2005) | 0.20 in (2001) |
| September 25 | 100.9°F (2019) | 50.0°F (2005) | 0.34 in (2014) |
| September 26 | 98.1°F (2016) | 46.9°F (2013) | 0.05 in (2023) |
| September 27 | 98.1°F (2020) | 48.0°F (2013) | 0.00 in (1998) |
| September 28 | 98.1°F (2010) | 51.1°F (2013) | 0.00 in (1998) |
| September 29 | 93.0°F (1999) | 46.9°F (2007) | 0.00 in (1998) |
| September 30 | 91.9°F (2024) | 48.9°F (2007) | 0.02 in (2015) |