Napa Valley weather in January
Temperature, rain and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Fair
Best time to visit: April – October
What is the weather like in Napa Valley in January?
In January, Napa Valley is cool: daytime highs average 14 °C, and nights cool down to about 5 °C. Expect around 4 hours of sunshine a day. Rain falls on about 9 days, adding up to 109 mm. All in all, January is a so-so month for a holiday in Napa Valley.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 55 | 58 | 70 |
| Day | 14° | 14° | 16° |
| Night | 5° | 5° | 6° |
| Sun | 4 h | 4 h | 6 h |
| Rain days | 10 | 9 | 9 |
More details for January
- Daylight
- 9 h 46 min07:25 – 17:11
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 12 km/haverage daily peakAll months
- Cloud cover
- 62 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−8America/Los_Angeles
How the score comes together
- Temperatureweight 50 %68 %
- Sunshineweight 20 %23 %
- Few rainy daysweight 30 %65 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in January
- A jumper for the evenings
- Rain jacket or umbrella
Napa Valley in January: quick answers
Is Napa Valley hot in January?
No. In January, Napa Valley is cool: daytime highs average 14 °C and nights drop to about 5 °C.
Does it rain much in Napa Valley in January?
Rain falls on about 9 days, adding up to 109 mm.
Napa Valley month by month
The whole year in Napa ValleyAll destinations: USAWhere to go in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences