August weather in San Luis Obispo, CA
The average temperature in San Luis Obispo in August is 67.1°F (54.9°F–79.3°F). Average precipitation: 0.01 inches.
August is a summer month in San Luis Obispo, and is warmer than the annual average of 59.7°F. Daily temperatures swing about 24.4°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 13h 20m. For travel, August is one of the best months of the year to visit.
Avg High
79.3°F
Avg Low
54.9°F
Precipitation
0.01 in
Daylight
13h 20m
August records in San Luis Obispo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 88.0°F (2000) | 46.0°F (1999) | 0.00 in (1998) |
| August 2 | 87.1°F (2008) | 48.9°F (2020) | 0.01 in (1998) |
| August 3 | 90.0°F (1998) | 51.1°F (2019) | 0.00 in (1998) |
| August 4 | 91.0°F (1998) | 48.0°F (2025) | 0.01 in (2012) |
| August 5 | 84.9°F (2018) | 50.0°F (2002) | 0.02 in (1999) |
| August 6 | 96.1°F (2018) | 48.9°F (2002) | 0.00 in (1998) |
| August 7 | 89.1°F (2024) | 46.9°F (2002) | 0.00 in (1998) |
| August 8 | 90.0°F (2002) | 48.0°F (2002) | 0.00 in (1998) |
| August 9 | 91.9°F (2018) | 50.0°F (2002) | 0.00 in (1998) |
| August 10 | 91.9°F (2018) | 50.0°F (2000) | 0.00 in (1998) |
| August 11 | 91.0°F (1998) | 50.0°F (2000) | 0.00 in (1998) |
| August 12 | 89.1°F (1998) | 46.9°F (2000) | 0.01 in (2000) |
| August 13 | 91.9°F (2009) | 50.0°F (1999) | 0.01 in (2020) |
| August 14 | 99.0°F (2020) | 50.0°F (1999) | 0.00 in (1998) |
| August 15 | 96.1°F (2020) | 45.0°F (1999) | 0.04 in (2008) |
| August 16 | 91.0°F (2020) | 50.0°F (2003) | 0.00 in (1998) |
| August 17 | 93.0°F (2020) | 51.1°F (2022) | 0.00 in (1998) |
| August 18 | 100.0°F (2020) | 48.9°F (2000) | 0.00 in (1998) |
| August 19 | 97.0°F (2020) | 46.9°F (2000) | 0.00 in (1998) |
| August 20 | 99.0°F (2024) | 48.0°F (1999) | 0.01 in (1999) |
| August 21 | 95.0°F (2025) | 46.0°F (2002) | 0.01 in (2000) |
| August 22 | 90.0°F (2020) | 46.9°F (2010) | 0.00 in (1998) |
| August 23 | 98.1°F (2010) | 51.1°F (1998) | 0.00 in (1998) |
| August 24 | 95.0°F (2010) | 48.0°F (1998) | 0.01 in (1998) |
| August 25 | 91.0°F (2024) | 51.1°F (2002) | 0.00 in (1998) |
| August 26 | 95.0°F (2024) | 50.0°F (2001) | 0.00 in (1998) |
| August 27 | 105.1°F (2009) | 48.0°F (2002) | 0.00 in (1998) |
| August 28 | 106.0°F (2009) | 48.9°F (2003) | 0.00 in (1998) |
| August 29 | 111.0°F (2009) | 48.9°F (2003) | 0.02 in (2007) |
| August 30 | 100.9°F (2023) | 48.0°F (2005) | 0.02 in (2007) |
| August 31 | 91.9°F (2025) | 48.0°F (1999) | 0.00 in (1998) |