January weather in San Diego, CA
The average temperature in San Diego in January is 56.6°F (46.0°F–67.3°F). Average precipitation: 2.32 inches.
January is a winter month in San Diego, and is cooler than the annual average of 64.1°F. Daily temperatures swing about 21.3°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 10h 4m. For travel, January is a comfortable month to visit.
Avg High
67.3°F
Avg Low
46.0°F
Precipitation
2.32 in
Daylight
10h 4m
January records in San Diego
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 75.9°F (2008) | 35.1°F (2015) | 1.89 in (2026) |
| January 2 | 81.0°F (2018) | 35.1°F (2015) | 0.39 in (2004) |
| January 3 | 80.1°F (2003) | 36.0°F (2019) | 1.00 in (2005) |
| January 4 | 84.9°F (2012) | 36.0°F (2013) | 0.47 in (2005) |
| January 5 | 84.9°F (2012) | 37.0°F (2013) | 2.43 in (2016) |
| January 6 | 84.9°F (2006) | 39.0°F (2024) | 0.63 in (2008) |
| January 7 | 80.1°F (2003) | 39.0°F (1999) | 0.96 in (2016) |
| January 8 | 79.0°F (2007) | 35.1°F (2024) | 0.22 in (2018) |
| January 9 | 79.0°F (2006) | 36.0°F (2024) | 1.68 in (2018) |
| January 10 | 78.1°F (2010) | 37.9°F (2026) | 0.34 in (2023) |
| January 11 | 82.0°F (2002) | 41.0°F (2000) | 1.10 in (2005) |
| January 12 | 86.0°F (2009) | 36.0°F (2013) | 0.82 in (2001) |
| January 13 | 87.1°F (2018) | 34.0°F (2007) | 0.36 in (2017) |
| January 14 | 86.0°F (2021) | 30.2°F (2007) | 1.29 in (2023) |
| January 15 | 88.0°F (2021) | 32.0°F (2007) | 0.88 in (2023) |
| January 16 | 82.9°F (2003) | 31.1°F (2007) | 1.18 in (2023) |
| January 17 | 84.9°F (2011) | 33.1°F (2007) | 0.27 in (2019) |
| January 18 | 82.0°F (2009) | 35.1°F (2001) | 1.53 in (2010) |
| January 19 | 84.9°F (2005) | 37.9°F (2002) | 0.69 in (2010) |
| January 20 | 82.9°F (2009) | 37.9°F (2008) | 1.54 in (2017) |
| January 21 | 78.1°F (2013) | 36.0°F (2006) | 0.97 in (2010) |
| January 22 | 82.0°F (2013) | 36.0°F (2007) | 2.04 in (2024) |
| January 23 | 77.0°F (2025) | 37.0°F (2007) | 0.59 in (2008) |
| January 24 | 80.1°F (2015) | 37.0°F (2023) | 0.16 in (2017) |
| January 25 | 82.0°F (2003) | 39.0°F (2002) | 0.84 in (2013) |
| January 26 | 84.0°F (2003) | 39.0°F (2002) | 0.75 in (1999) |
| January 27 | 97.0°F (2024) | 39.9°F (2009) | 0.46 in (2008) |
| January 28 | 84.9°F (2018) | 37.0°F (2017) | 0.28 in (2002) |
| January 29 | 100.0°F (2024) | 37.9°F (1999) | 1.02 in (2021) |
| January 30 | 102.0°F (2024) | 35.1°F (2002) | 0.34 in (2023) |
| January 31 | 88.0°F (2003) | 34.0°F (2002) | 0.54 in (2019) |