Napa, CA Weather & Growing Conditions
Tonight
44°F
Partly Cloudy
Partly cloudy, with a low around 44. North northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Partly Cloudy | 5 mph NNE | 1% |
| Wednesday | 68°F | Sunny | 2 to 7 mph NNW | 2% |
| Wednesday Night | 43°F | Mostly Cloudy then Patchy Fog | 3 mph NW | 2% |
| Thursday | 71°F | Patchy Fog then Mostly Sunny | 1 to 5 mph W | 0% |
| Thursday Night | 42°F | Mostly Clear | 2 mph WNW | 0% |
| Friday | 72°F | Sunny | 2 mph NNE | 0% |
| Friday Night | 43°F | Mostly Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 0 to 5 mph E | 0% |
| Saturday Night | 44°F | Mostly Clear then Patchy Fog | 0 mph | 0% |
| Sunday | 72°F | Areas Of Fog then Mostly Sunny | 2 mph NW | 0% |
| Sunday Night | 46°F | Partly Cloudy then Areas Of Fog | 0 mph | 0% |
| Monday | 71°F | Areas Of Fog then Partly Sunny | 0 to 3 mph WNW | 2% |
| Monday Night | 44°F | Partly Cloudy then Areas Of Fog | 0 to 3 mph NW | 2% |
| Tuesday | 71°F | Areas Of Fog then Sunny | 0 to 3 mph NW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Napa, CA
Last spring frost
Feb 12
First fall frost
Dec 4
Growing season
299 days
Hardiness zone
9b
Explore more for Napa, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Napa State Hospital, Ca (2.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.