Napa, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napa, a city in Napa County, California.
Today
87°F
Sunny
Sunny. High near 87, with temperatures falling to around 84 in the afternoon. South southwest wind 1 to 8 mph.
7-day forecast for Napa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 1 to 8 mph SSW | 0% |
| Tonight | 56°F | Partly Cloudy | 2 to 7 mph SSW | 0% |
| Wednesday | 86°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Wednesday Night | 56°F | Mostly Clear | 2 to 7 mph WSW | 0% |
| Thursday | 86°F | Sunny | 2 to 8 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Friday | 90°F | Mostly Sunny | 1 to 8 mph WSW | 0% |
| Friday Night | 58°F | Mostly Clear | 1 to 8 mph WSW | 0% |
| Saturday | 89°F | Sunny | 1 to 8 mph SW | 0% |
| Saturday Night | 59°F | Mostly Clear | 1 to 8 mph SW | 0% |
| Sunday | 86°F | Sunny | 1 to 8 mph SW | 0% |
| Sunday Night | 56°F | Mostly Clear then Patchy Fog | 2 to 8 mph SW | 0% |
| Monday | 78°F | Patchy Fog then Mostly Sunny | 2 to 9 mph SW | 0% |
| Monday Night | 55°F | Partly Cloudy | 1 to 9 mph SW | 0% |
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 Aug 4, 2026.