American Canyon, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for American Canyon, a city in Napa County, California.
Today
66°F
Sunny
Sunny. High near 66, with temperatures falling to around 63 in the afternoon. West northwest wind 2 to 7 mph.
7-day forecast for American Canyon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Sunny | 2 to 7 mph WNW | 1% |
| Tonight | 45°F | Mostly Cloudy then Patchy Fog | 3 mph WNW | 1% |
| Thursday | 69°F | Patchy Fog then Sunny | 3 mph W | 0% |
| Thursday Night | 46°F | Mostly Clear then Patchy Fog | 2 mph NW | 0% |
| Friday | 69°F | Mostly Sunny | 3 mph ENE | 0% |
| Friday Night | 47°F | Mostly Clear | 2 mph NNW | 0% |
| Saturday | 71°F | Sunny | 1 to 6 mph ENE | 0% |
| Saturday Night | 47°F | Mostly Clear | 1 mph NNW | 0% |
| Sunday | 71°F | Mostly Sunny | 2 mph NNW | 0% |
| Sunday Night | 48°F | Partly Cloudy then Patchy Fog | 1 mph WNW | 0% |
| Monday | 69°F | Areas Of Fog then Partly Sunny | 0 to 3 mph W | 0% |
| Monday Night | 48°F | Partly Cloudy then Areas Of Fog | 2 mph NW | 1% |
| Tuesday | 70°F | Areas Of Fog then Mostly Sunny | 2 mph W | 1% |
| Tuesday Night | 50°F | Partly Cloudy then Patchy Fog | 2 mph WNW | 9% |
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.