January weather in Lake Forest, CA
The average temperature in Lake Forest in January is 58.8°F (48.6°F–69.0°F). Average precipitation: 2.67 inches.
January is a winter month in Lake Forest, and is cooler than the annual average of 66.7°F. Daily temperatures swing about 20.4°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 9h 60m. For travel, January is a comfortable month to visit.
Avg High
69.0°F
Avg Low
48.6°F
Precipitation
2.67 in
Daylight
9h 60m
January records in Lake Forest
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 80.1°F (2012) | 33.1°F (2011) | 1.60 in (2023) |
| January 2 | 80.1°F (2012) | 34.0°F (2007) | 0.92 in (2006) |
| January 3 | 81.0°F (2012) | 36.0°F (2009) | 1.16 in (2005) |
| January 4 | 86.0°F (2012) | 37.9°F (2009) | 0.54 in (2005) |
| January 5 | 88.0°F (2006) | 37.0°F (2007) | 1.51 in (2008) |
| January 6 | 88.0°F (2015) | 37.9°F (2013) | 0.87 in (2016) |
| January 7 | 84.9°F (2015) | 36.0°F (2011) | 0.56 in (2008) |
| January 8 | 81.0°F (2007) | 39.0°F (2011) | 0.00 in (2005) |
| January 9 | 82.9°F (2007) | 42.1°F (2007) | 1.86 in (2005) |
| January 10 | 78.1°F (2006) | 42.1°F (2020) | 3.18 in (2005) |
| January 11 | 86.0°F (2009) | 30.0°F (2013) | 1.12 in (2015) |
| January 12 | 84.9°F (2009) | 30.0°F (2013) | 0.87 in (2019) |
| January 13 | 87.1°F (2009) | 30.9°F (2013) | 0.08 in (2010) |
| January 14 | 88.0°F (2009) | 30.0°F (2007) | 0.50 in (2019) |
| January 15 | 90.0°F (2021) | 32.0°F (2013) | 2.09 in (2023) |
| January 16 | 88.0°F (2014) | 37.0°F (2006) | 1.12 in (2023) |
| January 17 | 89.1°F (2014) | 37.0°F (2007) | 1.28 in (2019) |
| January 18 | 86.0°F (2005) | 36.0°F (2012) | 1.46 in (2010) |
| January 19 | 88.0°F (2005) | 37.0°F (2012) | 0.80 in (2017) |
| January 20 | 82.0°F (2009) | 39.9°F (2008) | 1.20 in (2017) |
| January 21 | 82.9°F (2013) | 37.9°F (2023) | 0.72 in (2010) |
| January 22 | 82.9°F (2025) | 36.0°F (2023) | 2.28 in (2017) |
| January 23 | 81.0°F (2025) | 39.0°F (2010) | 0.32 in (2017) |
| January 24 | 81.0°F (2015) | 37.9°F (2017) | 0.56 in (2008) |
| January 25 | 84.0°F (2012) | 41.0°F (2023) | 0.93 in (2021) |
| January 26 | 82.9°F (2012) | 37.0°F (2021) | 0.48 in (2013) |
| January 27 | 82.0°F (2011) | 39.0°F (2009) | 0.72 in (2025) |
| January 28 | 84.9°F (2018) | 36.0°F (2013) | 1.57 in (2008) |
| January 29 | 90.0°F (2018) | 36.0°F (2013) | 1.27 in (2021) |
| January 30 | 87.1°F (2026) | 39.0°F (2013) | 0.43 in (2011) |
| January 31 | 87.1°F (2026) | 39.9°F (2010) | 0.40 in (2019) |