American Canyon, CA Weather & Growing Conditions
Today
78°F
Sunny
Sunny. High near 78, with temperatures falling to around 76 in the afternoon. West southwest wind 5 to 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Sunny | 5 to 12 mph WSW | 0% |
| Tonight | 55°F | Partly Cloudy | 6 to 9 mph WSW | 0% |
| Sunday | 70°F | Mostly Cloudy | 6 to 9 mph SW | 0% |
| Sunday Night | 55°F | Mostly Cloudy | 8 mph WSW | 0% |
| Monday | 70°F | Mostly Sunny | 8 to 12 mph SW | 0% |
| Monday Night | 54°F | Partly Cloudy | 8 to 12 mph SW | 0% |
| Tuesday | 71°F | Mostly Sunny | 6 to 9 mph SW | 0% |
| Tuesday Night | 54°F | Mostly Clear | 3 to 9 mph SW | 0% |
| Wednesday | 82°F | Mostly Sunny | 3 to 7 mph WSW | 0% |
| Wednesday Night | 58°F | Partly Cloudy | 2 to 7 mph WSW | 0% |
| Thursday | 85°F | Mostly Sunny | 2 to 8 mph WSW | 0% |
| Thursday Night | 58°F | Mostly Clear | 5 to 8 mph WSW | 0% |
| Friday | 77°F | Mostly Sunny | 6 to 10 mph WSW | 0% |
| Friday Night | 56°F | Partly Cloudy | 7 to 10 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for American Canyon, CA
Last spring frost
Mar 5
First fall frost
Nov 21
Growing season
256 days
Hardiness zone
9b
Explore more for American Canyon, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Napa Co Ap, Ca (3.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.