September weather in Chula Vista, CA
The average temperature in Chula Vista in September is 70.3°F (60.8°F–79.8°F). Average precipitation: 0.18 inches.
September is a fall month in Chula Vista, and is warmer than the annual average of 62.6°F. Daily temperatures swing about 19°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 12h 11m. For travel, September is one of the best months of the year to visit.
Avg High
79.8°F
Avg Low
60.8°F
Precipitation
0.18 in
Daylight
12h 11m
September records in Chula Vista
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (2017) | 54.0°F (2010) | 0.05 in (1998) |
| September 2 | 97.0°F (2007) | 55.9°F (2000) | 0.00 in (1998) |
| September 3 | 100.0°F (2007) | 54.0°F (1999) | 0.07 in (1998) |
| September 4 | 95.0°F (2009) | 54.0°F (2004) | 0.14 in (2019) |
| September 5 | 102.9°F (2004) | 55.0°F (2000) | 0.02 in (2011) |
| September 6 | 105.1°F (2020) | 55.0°F (2000) | 0.13 in (2011) |
| September 7 | 100.9°F (2024) | 57.0°F (2001) | 0.27 in (2002) |
| September 8 | 104.0°F (2024) | 57.9°F (1999) | 0.08 in (2017) |
| September 9 | 99.0°F (2015) | 53.1°F (2010) | 0.27 in (2022) |
| September 10 | 96.1°F (2015) | 50.0°F (2010) | 0.05 in (2012) |
| September 11 | 93.0°F (2000) | 55.9°F (2000) | 0.01 in (2000) |
| September 12 | 96.1°F (2000) | 54.0°F (2005) | 0.00 in (1998) |
| September 13 | 91.0°F (2000) | 55.9°F (2005) | 0.00 in (1998) |
| September 14 | 106.0°F (2012) | 55.0°F (2016) | 0.00 in (1998) |
| September 15 | 105.1°F (2012) | 52.0°F (2016) | 0.81 in (2015) |
| September 16 | 100.9°F (2014) | 52.0°F (2006) | 0.05 in (2015) |
| September 17 | 97.0°F (2020) | 51.1°F (2010) | 0.20 in (2025) |
| September 18 | 97.0°F (2020) | 54.0°F (2010) | 0.11 in (2025) |
| September 19 | 86.0°F (2020) | 52.0°F (2023) | 0.02 in (2014) |
| September 20 | 99.0°F (2015) | 50.0°F (1999) | 0.73 in (2016) |
| September 21 | 93.0°F (2021) | 50.0°F (2007) | 0.05 in (1999) |
| September 22 | 91.9°F (2021) | 53.1°F (2010) | 0.11 in (2007) |
| September 23 | 99.0°F (2009) | 51.1°F (2010) | 0.01 in (2001) |
| September 24 | 104.0°F (1997) | 52.0°F (2000) | 0.06 in (2021) |
| September 25 | 96.1°F (2016) | 52.0°F (2017) | 0.02 in (2019) |
| September 26 | 99.0°F (2016) | 52.0°F (1998) | 0.01 in (2009) |
| September 27 | 108.0°F (2010) | 48.9°F (2013) | 0.02 in (2019) |
| September 28 | 99.0°F (2005) | 52.0°F (2001) | 0.03 in (2007) |
| September 29 | 99.0°F (1999) | 50.0°F (2001) | 0.01 in (2001) |
| September 30 | 100.9°F (2020) | 48.0°F (2019) | 0.18 in (2010) |