Napa Weather in January
Average highs run from 58°F on January 1 to 61°F on January 31, and lows from 39°F to 41°F. Normal precipitation for the month is 4.98 in over about 12 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 59°F
- Average low
- 40°F
- Precipitation
- 4.98 in
- Record high
- 80°FJan 12, 2009
- Record low
- 18°FJan 15, 2007
- Chance of a freeze
- 72%
- Daylight
- 9 h 34 min to 10 h 16 min
- Cloud cover
- 59%
- Humidity
- 84%
- Dew point
- 41°F
- Wind
- 6.5 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 58°F | 39°F | 65°F 2023 | 25°F 2014 | 38% |
| Jan 2 | 58°F | 39°F | 67°F 2014 | 23°F 2000 | 38% |
| Jan 3 | 58°F | 39°F | 66°F 2014 | 26°F 2004 | 38% |
| Jan 4 | 58°F | 39°F | 67°F 2012 | 22°F 2009 | 38% |
| Jan 5 | 58°F | 40°F | 70°F 2014 | 24°F 2014 | 38% |
| Jan 6 | 58°F | 40°F | 66°F 2003 | 25°F 2007 | 38% |
| Jan 7 | 58°F | 40°F | 70°F 2025 | 25°F 1999 | 39% |
| Jan 8 | 58°F | 40°F | 65°F 2012 | 28°F 2007 | 39% |
| Jan 9 | 58°F | 40°F | 69°F 2025 | 27°F 2001 | 39% |
| Jan 10 | 58°F | 40°F | 64°F 2025 | 28°F 2011 | 39% |
| Jan 11 | 58°F | 40°F | 68°F 2025 | 24°F 2007 | 39% |
| Jan 12 | 58°F | 40°F | 80°F 2009 | 26°F 2012 | 39% |
| Jan 13 | 58°F | 40°F | 68°F 2009 | 22°F 2013 | 39% |
| Jan 14 | 58°F | 40°F | 68°F 2014 | 23°F 2007 | 39% |
| Jan 15 | 58°F | 40°F | 70°F 2014 | 18°F 2007 | 39% |
| Jan 16 | 58°F | 40°F | 74°F 2021 | 20°F 2007 | 39% |
| Jan 17 | 59°F | 40°F | 73°F 2021 | 19°F 2012 | 39% |
| Jan 18 | 59°F | 40°F | 80°F 2021 | 24°F 2001 | 39% |
| Jan 19 | 59°F | 40°F | 70°F 2014 | 24°F 2007 | 39% |
| Jan 20 | 59°F | 40°F | 71°F 2014 | 25°F 2007 | 39% |
| Jan 21 | 59°F | 40°F | 68°F 2007 | 26°F 2008 | 39% |
| Jan 22 | 59°F | 40°F | 73°F 2022 | 27°F 2014 | 39% |
| Jan 23 | 59°F | 41°F | 73°F 2014 | 26°F 2002 | 39% |
| Jan 24 | 59°F | 41°F | 67°F 2014 | 26°F 2007 | 39% |
| Jan 25 | 60°F | 41°F | 70°F 2014 | 27°F 2007 | 39% |
| Jan 26 | 60°F | 41°F | 69°F 2014 | 25°F 2021 | 39% |
| Jan 27 | 60°F | 41°F | 71°F 2012 | 28°F 2001 | 38% |
| Jan 28 | 60°F | 41°F | 71°F 2024 | 27°F 1999 | 38% |
| Jan 29 | 60°F | 41°F | 71°F 2024 | 28°F 2002 | 38% |
| Jan 30 | 60°F | 41°F | 66°F 2020 | 23°F 2002 | 38% |
| Jan 31 | 61°F | 41°F | 72°F 2015 | 23°F 2001 | 38% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:26 AM, sunset 5:00 PM
- January 31
- sunrise 7:15 AM, sunset 5:31 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046074 (Napa State Hospital), public domain. Records: NOAA GHCN-Daily, station USW00093227, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.