August weather in Costa Mesa, CA
The average temperature in Costa Mesa in August is 73.8°F (67.1°F–80.4°F). Average precipitation: 0.01 inches.
August is a summer month in Costa Mesa, and is warmer than the annual average of 64.9°F. Daily temperatures swing about 13.3°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 13h 15m. For travel, August is a comfortable month to visit.
Avg High
80.4°F
Avg Low
67.1°F
Precipitation
0.01 in
Daylight
13h 15m
August records in Costa Mesa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 91.0°F (2018) | 63.0°F (1999) | 0.00 in (1999) |
| August 2 | 88.0°F (2011) | 62.1°F (1999) | 0.03 in (1999) |
| August 3 | 88.0°F (2009) | 62.1°F (2011) | 0.03 in (2014) |
| August 4 | 90.0°F (2009) | 60.1°F (2011) | 0.00 in (1999) |
| August 5 | 88.0°F (2015) | 62.1°F (2002) | 0.00 in (1999) |
| August 6 | 89.1°F (2018) | 61.0°F (2002) | 0.00 in (1999) |
| August 7 | 90.0°F (2018) | 61.0°F (2011) | 0.00 in (1999) |
| August 8 | 91.9°F (2018) | 60.1°F (1999) | 0.00 in (1999) |
| August 9 | 91.0°F (2018) | 60.1°F (1999) | 0.00 in (1999) |
| August 10 | 91.0°F (2003) | 63.0°F (1999) | 0.00 in (1999) |
| August 11 | 89.1°F (2003) | 62.1°F (2020) | 0.00 in (1999) |
| August 12 | 91.9°F (2012) | 62.1°F (1999) | 0.00 in (1999) |
| August 13 | 90.0°F (2020) | 62.1°F (2010) | 0.00 in (1999) |
| August 14 | 93.0°F (2020) | 61.0°F (2010) | 0.00 in (1999) |
| August 15 | 90.0°F (2016) | 62.1°F (1999) | 0.00 in (1999) |
| August 16 | 90.0°F (2014) | 60.1°F (1999) | 0.00 in (1999) |
| August 17 | 93.0°F (2012) | 62.1°F (1999) | 0.00 in (1999) |
| August 18 | 100.0°F (2020) | 62.1°F (1999) | 0.00 in (1999) |
| August 19 | 90.0°F (2020) | 60.1°F (1999) | 0.00 in (1999) |
| August 20 | 91.9°F (2024) | 62.1°F (1999) | 2.01 in (2023) |
| August 21 | 88.0°F (2025) | 62.1°F (1999) | 0.12 in (2023) |
| August 22 | 93.9°F (2020) | 62.1°F (2005) | 0.00 in (1999) |
| August 23 | 91.0°F (2010) | 61.0°F (2002) | 0.00 in (1999) |
| August 24 | 90.0°F (2010) | 60.1°F (2002) | 0.00 in (1999) |
| August 25 | 91.9°F (2005) | 61.0°F (2002) | 0.00 in (1999) |
| August 26 | 93.0°F (2009) | 60.1°F (2003) | 0.00 in (1999) |
| August 27 | 96.1°F (2009) | 57.9°F (2003) | 0.00 in (1999) |
| August 28 | 93.0°F (2014) | 62.1°F (1999) | 0.00 in (1999) |
| August 29 | 95.0°F (2013) | 61.0°F (1999) | 0.00 in (1999) |
| August 30 | 98.1°F (2013) | 62.1°F (1999) | 0.00 in (1999) |
| August 31 | 97.0°F (2022) | 62.1°F (2010) | 0.00 in (1999) |