October weather in Costa Mesa, CA
The average temperature in Costa Mesa in October is 67.8°F (59.2°F–76.5°F). Average precipitation: 0.54 inches.
October is a fall month in Costa Mesa, and is warmer than the annual average of 64.9°F. Daily temperatures swing about 17.3°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 11h 8m. For travel, October is one of the best months of the year to visit.
Avg High
76.5°F
Avg Low
59.2°F
Precipitation
0.54 in
Daylight
11h 8m
October records in Costa Mesa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 97.0°F (2020) | 57.0°F (2002) | 0.00 in (1999) |
| October 2 | 98.1°F (2014) | 53.1°F (2002) | 0.02 in (2010) |
| October 3 | 102.0°F (2014) | 54.0°F (2002) | 0.11 in (2018) |
| October 4 | 96.1°F (2014) | 55.0°F (2002) | 0.26 in (2021) |
| October 5 | 99.0°F (2005) | 55.9°F (2009) | 0.62 in (2011) |
| October 6 | 95.0°F (2005) | 53.1°F (2007) | 0.59 in (2010) |
| October 7 | 97.0°F (2008) | 55.0°F (2011) | 0.01 in (2021) |
| October 8 | 93.0°F (1999) | 52.0°F (2011) | 0.07 in (2021) |
| October 9 | 102.9°F (2015) | 55.0°F (2007) | 0.20 in (2013) |
| October 10 | 100.0°F (2015) | 52.0°F (2013) | 0.00 in (1999) |
| October 11 | 93.9°F (2015) | 54.0°F (2008) | 0.09 in (2012) |
| October 12 | 99.0°F (2011) | 51.1°F (2008) | 0.52 in (2018) |
| October 13 | 93.0°F (2011) | 52.0°F (2021) | 0.21 in (2018) |
| October 14 | 91.0°F (2020) | 53.1°F (2021) | 0.75 in (2025) |
| October 15 | 93.9°F (2017) | 55.0°F (2000) | 0.25 in (2022) |
| October 16 | 91.9°F (2017) | 54.0°F (2018) | 0.27 in (2005) |
| October 17 | 95.0°F (2012) | 55.9°F (1999) | 0.82 in (2004) |
| October 18 | 91.0°F (2018) | 53.1°F (1999) | 0.11 in (2005) |
| October 19 | 95.0°F (2022) | 54.0°F (1999) | 1.15 in (2010) |
| October 20 | 96.1°F (2016) | 55.0°F (2006) | 2.68 in (2004) |
| October 21 | 91.0°F (2019) | 54.0°F (2004) | 0.02 in (2010) |
| October 22 | 99.0°F (2008) | 55.0°F (2004) | 0.01 in (2008) |
| October 23 | 99.0°F (2007) | 54.0°F (2004) | 0.22 in (2016) |
| October 24 | 106.0°F (2017) | 55.0°F (2004) | 0.58 in (2016) |
| October 25 | 99.0°F (2017) | 54.0°F (2008) | 0.32 in (2021) |
| October 26 | 93.0°F (2003) | 54.0°F (2002) | 1.34 in (2004) |
| October 27 | 90.0°F (2012) | 51.1°F (2006) | 0.95 in (2004) |
| October 28 | 88.0°F (2021) | 50.0°F (2011) | 0.14 in (2004) |
| October 29 | 86.0°F (2025) | 46.0°F (2009) | 0.30 in (2000) |
| October 30 | 89.1°F (1999) | 50.0°F (2009) | 0.25 in (2010) |
| October 31 | 91.0°F (2005) | 46.9°F (2019) | 0.06 in (2003) |