December weather in San Luis Obispo, CA
The average temperature in San Luis Obispo in December is 52.6°F (40.2°F–64.9°F). Average precipitation: 3.27 inches.
December is a winter month in San Luis Obispo, and is cooler than the annual average of 59.7°F. Daily temperatures swing about 24.7°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 38m. For travel, December is a comfortable month to visit.
Avg High
64.9°F
Avg Low
40.2°F
Precipitation
3.27 in
Daylight
9h 38m
December records in San Luis Obispo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 88.0°F (2021) | 32.0°F (2004) | 1.44 in (2022) |
| December 2 | 80.1°F (2013) | 33.1°F (2004) | 1.31 in (2005) |
| December 3 | 80.1°F (2006) | 31.1°F (2011) | 0.72 in (2022) |
| December 4 | 81.0°F (2006) | 30.2°F (2011) | 0.42 in (2014) |
| December 5 | 87.1°F (2023) | 32.0°F (2011) | 0.78 in (2010) |
| December 6 | 81.0°F (2024) | 25.2°F (2013) | 0.46 in (2007) |
| December 7 | 82.9°F (2017) | 30.0°F (1998) | 1.77 in (2004) |
| December 8 | 82.9°F (2020) | 29.1°F (2009) | 0.69 in (2019) |
| December 9 | 84.0°F (2017) | 28.2°F (2013) | 0.98 in (2006) |
| December 10 | 82.9°F (2025) | 30.0°F (1998) | 1.03 in (2022) |
| December 11 | 84.0°F (2017) | 30.9°F (1998) | 0.72 in (2014) |
| December 12 | 86.0°F (2017) | 30.2°F (2013) | 1.73 in (2009) |
| December 13 | 82.9°F (2017) | 33.1°F (2007) | 1.78 in (2021) |
| December 14 | 80.1°F (2017) | 32.0°F (2008) | 0.91 in (2008) |
| December 15 | 82.0°F (2013) | 32.0°F (2007) | 1.60 in (2016) |
| December 16 | 84.9°F (2013) | 30.2°F (2007) | 1.86 in (2002) |
| December 17 | 82.0°F (2013) | 29.1°F (2022) | 0.65 in (2010) |
| December 18 | 81.0°F (2024) | 32.0°F (2008) | 3.15 in (2010) |
| December 19 | 82.9°F (2024) | 28.2°F (2006) | 3.63 in (2010) |
| December 20 | 80.1°F (1999) | 28.0°F (1998) | 1.49 in (2023) |
| December 21 | 80.1°F (2020) | 24.1°F (1998) | 0.47 in (2002) |
| December 22 | 73.9°F (2016) | 21.9°F (1998) | 1.19 in (2010) |
| December 23 | 79.0°F (1999) | 23.0°F (1998) | 1.49 in (2021) |
| December 24 | 84.0°F (2013) | 23.0°F (1998) | 1.30 in (2025) |
| December 25 | 84.0°F (2013) | 27.0°F (1998) | 1.16 in (2010) |
| December 26 | 84.9°F (2013) | 30.9°F (2000) | 0.40 in (2006) |
| December 27 | 84.9°F (2013) | 29.1°F (2015) | 1.79 in (2004) |
| December 28 | 81.0°F (2017) | 32.0°F (2003) | 1.17 in (2004) |
| December 29 | 82.9°F (2017) | 33.1°F (2018) | 1.02 in (2010) |
| December 30 | 75.0°F (2013) | 30.9°F (2000) | 2.33 in (2004) |
| December 31 | 75.0°F (2011) | 30.0°F (2000) | 1.44 in (2005) |