Napa, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napa, a city in Napa County, California.
Tonight
45°F
Partly Cloudy
Partly cloudy, with a low around 45. North northeast wind around 5 mph.
7-day forecast for Napa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Partly Cloudy | 5 mph NNE | 1% |
| Wednesday | 68°F | Sunny | 2 to 6 mph NW | 2% |
| Wednesday Night | 44°F | Mostly Cloudy then Patchy Fog | 2 mph NW | 2% |
| Thursday | 72°F | Patchy Fog then Mostly Sunny | 3 mph WNW | 0% |
| Thursday Night | 43°F | Mostly Clear | 1 mph NNW | 0% |
| Friday | 72°F | Sunny | 2 mph SW | 0% |
| Friday Night | 44°F | Mostly Clear | 2 mph WNW | 0% |
| Saturday | 74°F | Sunny | 0 to 3 mph ENE | 0% |
| Saturday Night | 45°F | Mostly Clear | 2 mph W | 0% |
| Sunday | 73°F | Patchy Fog then Mostly Sunny | 2 mph W | 0% |
| Sunday Night | 46°F | Partly Cloudy then Patchy Fog | 2 mph WNW | 0% |
| Monday | 71°F | Patchy Fog then Partly Sunny | 0 to 3 mph W | 2% |
| Monday Night | 46°F | Partly Cloudy then Patchy Fog | 0 to 3 mph NW | 2% |
| Tuesday | 71°F | Areas Of Fog then Mostly Sunny | 0 to 3 mph NW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Napa (38.298, -122.301). Updated through the day.
Growing snapshot for Napa
Last spring frost
Feb 12
First fall frost
Dec 4
Growing season
299 days
Hardiness zone
9b
More local growing data for Napa: nearby ZIP 94559 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
American Canyon
Angwin
Deer Park
Moskowite Corner
Oakville
Rutherford
Silverado Resort
St. Helena
Yountville
Climate data from the nearest NOAA station, Napa State Hospital, Ca (2.5 mi from Napa). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.