August weather in Fullerton, CA
The average temperature in Fullerton in August is 76.5°F (66.4°F–86.7°F). Average precipitation: 0.02 inches.
August is a summer month in Fullerton, and is warmer than the annual average of 66.2°F. Daily temperatures swing about 20.3°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 13h 16m. For travel, August is a comfortable month to visit.
Avg High
86.7°F
Avg Low
66.4°F
Precipitation
0.02 in
Daylight
13h 16m
August records in Fullerton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 96.1°F (2018) | 61.0°F (1998) | 0.00 in (1998) |
| August 2 | 97.0°F (2021) | 59.0°F (2010) | 0.02 in (2014) |
| August 3 | 96.1°F (2009) | 60.1°F (2010) | 0.08 in (2014) |
| August 4 | 97.0°F (2009) | 59.0°F (2011) | 0.00 in (1998) |
| August 5 | 97.0°F (2024) | 60.1°F (2011) | 0.00 in (1998) |
| August 6 | 97.0°F (2018) | 61.0°F (2010) | 0.00 in (1998) |
| August 7 | 97.0°F (2018) | 60.1°F (2011) | 0.00 in (1998) |
| August 8 | 96.1°F (2018) | 59.0°F (1999) | 0.00 in (1998) |
| August 9 | 100.9°F (2018) | 57.9°F (2010) | 0.01 in (2023) |
| August 10 | 100.0°F (2012) | 57.9°F (2010) | 0.01 in (2023) |
| August 11 | 98.1°F (2022) | 60.1°F (2010) | 0.00 in (1998) |
| August 12 | 102.9°F (2012) | 55.9°F (2010) | 0.00 in (1998) |
| August 13 | 98.1°F (2020) | 57.9°F (2010) | 0.00 in (1998) |
| August 14 | 100.0°F (2020) | 57.9°F (2010) | 0.00 in (1998) |
| August 15 | 102.0°F (2015) | 59.0°F (2010) | 0.00 in (1998) |
| August 16 | 100.9°F (2015) | 59.0°F (1999) | 0.01 in (2023) |
| August 17 | 100.9°F (2012) | 60.1°F (2005) | 0.00 in (1998) |
| August 18 | 107.1°F (2020) | 61.0°F (2005) | 0.00 in (1998) |
| August 19 | 97.0°F (2020) | 60.1°F (2005) | 0.00 in (1998) |
| August 20 | 98.1°F (2007) | 60.1°F (1998) | 2.01 in (2023) |
| August 21 | 95.0°F (1998) | 61.0°F (1998) | 0.16 in (2023) |
| August 22 | 98.1°F (1998) | 60.1°F (2005) | 0.00 in (1998) |
| August 23 | 95.0°F (2020) | 59.0°F (2002) | 0.00 in (1998) |
| August 24 | 97.0°F (2010) | 57.0°F (2002) | 0.00 in (1998) |
| August 25 | 97.0°F (2005) | 57.9°F (2002) | 0.04 in (2003) |
| August 26 | 100.9°F (2009) | 61.0°F (2002) | 0.00 in (1998) |
| August 27 | 107.1°F (2009) | -0.8°F (2012) | 0.00 in (1998) |
| August 28 | 100.0°F (2012) | 62.1°F (1999) | 0.00 in (1998) |
| August 29 | 102.0°F (1998) | 60.1°F (2010) | 0.00 in (1998) |
| August 30 | 102.9°F (1998) | 57.0°F (2010) | 0.00 in (1998) |
| August 31 | 104.0°F (2007) | 57.9°F (2010) | 0.01 in (2017) |