October weather in Union City, CA
The average temperature in Union City in October is 62.6°F (52.0°F–73.3°F). Average precipitation: 0.69 inches.
October is a fall month in Union City, and is warmer than the annual average of 59.5°F. Daily temperatures swing about 21.3°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 11h 0m. For travel, October is one of the best months of the year to visit.
Avg High
73.3°F
Avg Low
52.0°F
Precipitation
0.69 in
Daylight
11h 0m
October records in Union City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 93.0°F (2024) | 45.0°F (2019) | 0.00 in (1996) |
| October 2 | 97.0°F (2024) | 45.0°F (2019) | 0.47 in (2025) |
| October 3 | 96.1°F (2024) | 45.0°F (2019) | 0.01 in (2016) |
| October 4 | 90.0°F (2014) | 46.0°F (2017) | 0.13 in (2011) |
| October 5 | 91.0°F (2024) | 43.0°F (2009) | 0.40 in (2011) |
| October 6 | 93.9°F (2024) | 43.0°F (2007) | 0.26 in (2011) |
| October 7 | 95.0°F (1996) | 42.1°F (1997) | 0.00 in (1996) |
| October 8 | 98.1°F (1996) | 48.0°F (2011) | 0.00 in (1996) |
| October 9 | 87.1°F (1999) | 46.0°F (2005) | 0.37 in (1997) |
| October 10 | 89.1°F (1999) | 45.0°F (2019) | 0.45 in (2007) |
| October 11 | 84.9°F (2004) | 42.1°F (2007) | 0.01 in (2000) |
| October 12 | 89.1°F (2010) | 43.0°F (2017) | 0.50 in (2007) |
| October 13 | 91.0°F (2015) | 43.0°F (2021) | 2.21 in (2009) |
| October 14 | 87.1°F (2001) | 44.1°F (2019) | 0.38 in (2009) |
| October 15 | 91.0°F (2020) | 44.1°F (2019) | 0.08 in (2005) |
| October 16 | 90.0°F (2020) | 44.1°F (2019) | 1.61 in (2016) |
| October 17 | 89.1°F (2020) | 43.0°F (1996) | 0.16 in (2007) |
| October 18 | 87.1°F (2012) | 45.0°F (1996) | 0.20 in (2004) |
| October 19 | 84.0°F (2012) | 42.1°F (2021) | 0.56 in (2004) |
| October 20 | 84.0°F (1998) | 39.9°F (1996) | 0.53 in (2004) |
| October 21 | 84.9°F (1998) | 41.0°F (1996) | 0.30 in (2021) |
| October 22 | 82.9°F (2019) | 42.1°F (1996) | 0.60 in (2012) |
| October 23 | 86.0°F (2017) | 42.1°F (2022) | 0.15 in (2004) |
| October 24 | 91.0°F (2017) | 41.0°F (2022) | 0.75 in (2021) |
| October 25 | 90.0°F (2003) | 46.0°F (2004) | 2.60 in (2021) |
| October 26 | 87.1°F (2003) | 39.9°F (1996) | 0.86 in (2004) |
| October 27 | 87.1°F (2003) | 39.9°F (2023) | 0.10 in (2000) |
| October 28 | 88.0°F (2003) | 42.1°F (2022) | 1.26 in (2016) |
| October 29 | 78.1°F (2010) | 39.9°F (2022) | 0.48 in (2000) |
| October 30 | 79.0°F (2014) | 39.9°F (2023) | 0.40 in (1996) |
| October 31 | 82.9°F (2015) | 39.9°F (2002) | 0.30 in (2014) |