American Canyon, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for American Canyon, a city in Napa County, California.
Tonight
46°F
Partly Cloudy
Partly cloudy. Low around 46, with temperatures rising to around 48 overnight. Northeast wind around 6 mph.
7-day forecast for American Canyon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Partly Cloudy | 6 mph NE | 1% |
| Wednesday | 66°F | Sunny | 2 to 7 mph NNW | 2% |
| Wednesday Night | 46°F | Mostly Cloudy then Patchy Fog | 3 mph W | 2% |
| Thursday | 69°F | Patchy Fog then Mostly Sunny | 3 mph WSW | 0% |
| Thursday Night | 45°F | Mostly Clear | 1 mph NW | 0% |
| Friday | 69°F | Mostly Sunny | 2 mph ENE | 0% |
| Friday Night | 47°F | Mostly Clear | 2 mph N | 0% |
| Saturday | 72°F | Sunny | 0 to 5 mph NE | 0% |
| Saturday Night | 47°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 70°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 48°F | Partly Cloudy | 1 mph NW | 0% |
| Monday | 69°F | Patchy Fog then Partly Sunny | 3 mph W | 2% |
| Monday Night | 47°F | Partly Cloudy then Patchy Fog | 2 mph NW | 2% |
| Tuesday | 69°F | Areas Of Fog then Sunny | 2 mph NW | 6% |
Forecast source: National Weather Service (api.weather.gov) for American Canyon (38.179, -122.260). Updated through the day.
Growing snapshot for American Canyon
Last spring frost
Mar 5
First fall frost
Nov 21
Growing season
256 days
Hardiness zone
9b
More local growing data for American Canyon: nearby ZIP 94503 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Napa Co Ap, Ca (3.7 mi from American Canyon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.