January weather in Petaluma, CA
The average temperature in Petaluma in January is 48.3°F (39.0°F–57.6°F). Average precipitation: 4.77 inches.
January is a winter month in Petaluma, and is cooler than the annual average of 58°F. Daily temperatures swing about 18.6°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 37m. For travel, January is a comfortable month to visit.
Avg High
57.6°F
Avg Low
39.0°F
Precipitation
4.77 in
Daylight
9h 37m
January records in Petaluma
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 93.0°F (1925) | 18.0°F (1919) | 1.39 in (1997) |
| January 2 | 90.0°F (1925) | 19.0°F (1919) | 1.52 in (2002) |
| January 3 | 91.9°F (1925) | 19.0°F (1919) | 4.00 in (1916) |
| January 4 | 69.1°F (1934) | 19.9°F (1919) | 3.62 in (1982) |
| January 5 | 86.0°F (1925) | 21.9°F (1949) | 2.43 in (1959) |
| January 6 | 87.1°F (1925) | 21.9°F (1919) | 1.70 in (2019) |
| January 7 | 75.0°F (1925) | 21.0°F (1919) | 1.01 in (1956) |
| January 8 | 84.9°F (1962) | 19.0°F (1937) | 2.15 in (2017) |
| January 9 | 82.0°F (1962) | 18.0°F (1937) | 3.11 in (1995) |
| January 10 | 73.0°F (1962) | 24.1°F (1920) | 4.06 in (1979) |
| January 11 | 80.1°F (2009) | 23.0°F (1963) | 1.92 in (1973) |
| January 12 | 80.1°F (2009) | 26.1°F (1920) | 2.47 in (1914) |
| January 13 | 70.0°F (1967) | 19.9°F (1963) | 1.73 in (1969) |
| January 14 | 70.0°F (1924) | 1.9°F (2014) | 2.54 in (1956) |
| January 15 | 72.0°F (1966) | 21.0°F (2007) | 2.42 in (1894) |
| January 16 | 77.0°F (1920) | 23.0°F (2007) | 1.75 in (1973) |
| January 17 | 75.0°F (1991) | 21.0°F (1917) | 2.54 in (1921) |
| January 18 | 80.1°F (2021) | 23.0°F (1943) | 2.04 in (1973) |
| January 19 | 78.1°F (2021) | 24.1°F (1917) | 1.70 in (1919) |
| January 20 | 78.1°F (2021) | 21.0°F (1963) | 2.98 in (1894) |
| January 21 | 70.0°F (1988) | 19.9°F (1937) | 3.60 in (1967) |
| January 22 | 72.0°F (2022) | 19.9°F (1937) | 1.87 in (1914) |
| January 23 | 79.0°F (1974) | 21.0°F (1937) | 1.90 in (1997) |
| January 24 | 73.9°F (1984) | 23.0°F (1962) | 1.73 in (2000) |
| January 25 | 75.9°F (1934) | 23.0°F (1937) | 2.31 in (1940) |
| January 26 | 75.0°F (1934) | 26.1°F (1937) | 1.45 in (1924) |
| January 27 | 70.0°F (1934) | 25.0°F (1948) | 1.85 in (2021) |
| January 28 | 70.0°F (1934) | 25.0°F (1948) | 1.28 in (1926) |
| January 29 | 69.1°F (1993) | 21.0°F (1957) | 1.15 in (1926) |
| January 30 | 71.1°F (1976) | 21.9°F (1975) | 2.44 in (1963) |
| January 31 | 75.9°F (2015) | 21.9°F (1918) | 2.41 in (1926) |