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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
83°F
Sunny
Sunny. High near 83, with temperatures falling to around 81 in the afternoon. Southwest wind 7 to 10 mph.

7-day forecast for American Canyon

WhenTempForecastWindPrecip
Today 83°F Sunny 7 to 10 mph SW 0%
Tonight 56°F Partly Cloudy 9 mph SW 0%
Wednesday 81°F Mostly Sunny 7 to 10 mph SW 0%
Wednesday Night 57°F Mostly Clear 9 mph WSW 0%
Thursday 81°F Sunny 6 to 10 mph WSW 0%
Thursday Night 57°F Mostly Clear 6 to 10 mph WSW 0%
Friday 86°F Mostly Sunny 5 to 9 mph WSW 0%
Friday Night 58°F Mostly Clear 5 to 9 mph WSW 0%
Saturday 84°F Sunny 3 to 9 mph SW 0%
Saturday Night 59°F Mostly Clear 5 to 9 mph SW 0%
Sunday 82°F Sunny 5 to 10 mph SW 0%
Sunday Night 57°F Mostly Clear 7 to 10 mph SW 0%
Monday 75°F Mostly Sunny 7 to 12 mph SW 0%
Monday Night 56°F Mostly Clear 7 to 12 mph SW 0%

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

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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 Aug 4, 2026.