January weather in Half Moon Bay, CA
The average temperature in Half Moon Bay in January is 51.4°F (43.4°F–59.4°F). Average precipitation: 5.07 inches.
January is a winter month in Half Moon Bay, and is cooler than the annual average of 54.9°F. Daily temperatures swing about 16°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 9h 41m. For travel, January is a wet month.
Avg High
59.4°F
Avg Low
43.4°F
Precipitation
5.07 in
Daylight
9h 41m
January records in Half Moon Bay
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 69.1°F (1996) | 32.0°F (1952) | 2.08 in (1997) |
| January 2 | 69.1°F (2001) | 30.9°F (1976) | 2.15 in (1997) |
| January 3 | 69.1°F (2001) | 30.9°F (1957) | 1.90 in (1974) |
| January 4 | 71.1°F (2001) | 28.0°F (2009) | 5.33 in (1982) |
| January 5 | 69.1°F (1964) | 28.9°F (1949) | 2.75 in (1982) |
| January 6 | 69.1°F (2003) | 30.9°F (2007) | 1.70 in (1959) |
| January 7 | 72.0°F (1962) | 33.1°F (1974) | 0.83 in (1940) |
| January 8 | 73.0°F (1962) | 30.9°F (1955) | 2.00 in (1979) |
| January 9 | 71.1°F (1962) | 33.1°F (1963) | 2.00 in (2018) |
| January 10 | 73.9°F (1962) | 28.9°F (1949) | 1.55 in (1995) |
| January 11 | 69.1°F (1961) | 27.0°F (1949) | 1.73 in (1979) |
| January 12 | 73.0°F (2009) | 28.0°F (2007) | 2.34 in (1993) |
| January 13 | 73.9°F (2009) | 28.0°F (2007) | 1.88 in (1941) |
| January 14 | 75.9°F (2009) | 27.0°F (2007) | 1.50 in (1970) |
| January 15 | 75.0°F (2009) | 28.9°F (2007) | 3.08 in (1978) |
| January 16 | 75.9°F (2014) | 28.0°F (2007) | 2.25 in (1973) |
| January 17 | 75.0°F (2009) | 28.0°F (2012) | 1.89 in (1954) |
| January 18 | 73.9°F (2021) | 27.0°F (2007) | 2.40 in (1973) |
| January 19 | 75.0°F (1992) | 30.0°F (1943) | 1.49 in (2010) |
| January 20 | 72.0°F (2009) | 28.0°F (1983) | 1.55 in (1999) |
| January 21 | 72.0°F (2009) | 30.0°F (2021) | 3.95 in (1967) |
| January 22 | 73.0°F (1968) | 32.0°F (2004) | 1.92 in (2024) |
| January 23 | 75.9°F (1948) | 30.0°F (1962) | 1.54 in (1942) |
| January 24 | 73.0°F (1948) | 30.9°F (1949) | 2.48 in (2000) |
| January 25 | 71.1°F (2006) | 28.0°F (1949) | 1.65 in (1997) |
| January 26 | 71.1°F (2003) | 32.0°F (1949) | 2.33 in (2008) |
| January 27 | 71.1°F (1984) | 30.9°F (1975) | 3.03 in (1981) |
| January 28 | 71.1°F (1984) | 30.9°F (1975) | 1.30 in (1956) |
| January 29 | 71.1°F (1984) | 30.9°F (1969) | 1.76 in (1966) |
| January 30 | 72.0°F (1962) | 30.0°F (1969) | 2.10 in (1968) |
| January 31 | 72.0°F (1962) | 28.9°F (1969) | 2.18 in (1963) |