January weather in Napa, CA
The average temperature in Napa in January is 49.4°F (40.1°F–58.6°F). Average precipitation: 4.98 inches.
January is a winter month in Napa, and is cooler than the annual average of 60.3°F. Daily temperatures swing about 18.5°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
58.6°F
Avg Low
40.1°F
Precipitation
4.98 in
Daylight
9h 37m
January records in Napa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 80.1°F (1996) | 23.0°F (1924) | 2.74 in (1997) |
| January 2 | 75.0°F (1924) | 21.9°F (1919) | 1.91 in (1940) |
| January 3 | 80.1°F (1924) | 21.9°F (1919) | 3.45 in (1916) |
| January 4 | 78.1°F (1924) | 21.9°F (1919) | 5.69 in (1982) |
| January 5 | 75.0°F (1924) | 19.9°F (1949) | 2.75 in (1966) |
| January 6 | 80.1°F (1924) | 24.1°F (1950) | 1.85 in (2019) |
| January 7 | 79.0°F (1924) | 24.1°F (1937) | 1.89 in (1940) |
| January 8 | 84.9°F (1962) | 25.0°F (1937) | 2.00 in (2017) |
| January 9 | 79.0°F (1924) | 19.0°F (1937) | 2.27 in (2023) |
| January 10 | 75.0°F (1932) | 26.1°F (1930) | 2.30 in (2017) |
| January 11 | 75.9°F (1924) | 26.1°F (1949) | 4.77 in (1979) |
| January 12 | 79.0°F (2009) | 23.0°F (1987) | 2.27 in (1911) |
| January 13 | 81.0°F (1924) | 19.9°F (1963) | 2.60 in (1993) |
| January 14 | 72.0°F (1924) | 24.1°F (1963) | 3.55 in (1970) |
| January 15 | 72.0°F (2014) | 25.0°F (1949) | 2.14 in (1909) |
| January 16 | 75.9°F (1920) | 24.1°F (1963) | 2.38 in (1996) |
| January 17 | 72.0°F (1920) | 23.0°F (2012) | 2.13 in (1921) |
| January 18 | 77.0°F (2021) | 26.1°F (1947) | 1.47 in (1973) |
| January 19 | 79.0°F (1976) | 25.0°F (1943) | 2.25 in (1894) |
| January 20 | 73.0°F (1976) | 21.9°F (1922) | 2.03 in (1896) |
| January 21 | 71.1°F (1924) | 23.0°F (1922) | 3.52 in (1967) |
| January 22 | 80.1°F (1968) | 21.9°F (1937) | 2.00 in (1997) |
| January 23 | 73.0°F (1948) | 25.0°F (1922) | 1.73 in (2012) |
| January 24 | 72.0°F (1924) | 26.1°F (1922) | 2.39 in (2000) |
| January 25 | 82.9°F (1899) | 25.0°F (1937) | 1.72 in (1997) |
| January 26 | 75.0°F (1934) | 24.1°F (1949) | 1.70 in (1958) |
| January 27 | 75.0°F (1984) | 26.1°F (1949) | 1.98 in (1981) |
| January 28 | 71.1°F (1924) | 25.0°F (1922) | 1.24 in (1896) |
| January 29 | 73.0°F (1962) | 26.1°F (1946) | 1.91 in (1968) |
| January 30 | 73.9°F (1962) | 25.0°F (1975) | 2.47 in (1963) |
| January 31 | 77.0°F (2015) | 25.0°F (1946) | 2.04 in (1963) |