Harman US

Williams, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Williams, a city in Colusa County, California.

Overnight
57°F
Clear
Clear. Low around 57, with temperatures rising to around 59 overnight. West northwest wind around 2 mph.

7-day forecast for Williams

WhenTempForecastWindPrecip
Overnight 57°F Clear 2 mph WNW 0%
Saturday 92°F Sunny 1 to 5 mph NNW 0%
Saturday Night 58°F Partly Cloudy 3 mph ESE 0%
Sunday 86°F Partly Sunny 1 to 5 mph ESE 0%
Sunday Night 57°F Mostly Cloudy 1 to 5 mph S 0%
Monday 90°F Mostly Sunny 1 to 6 mph SE 0%
Monday Night 56°F Mostly Clear 0 to 6 mph ESE 0%
Tuesday 89°F Sunny 1 to 6 mph ESE 0%
Tuesday Night 58°F Clear 0 to 6 mph N 0%
Wednesday 90°F Sunny 3 mph NE 0%
Wednesday Night 60°F Mostly Clear 0 to 3 mph NE 0%
Thursday 93°F Sunny 1 to 6 mph NNE 0%
Thursday Night 60°F Mostly Clear 1 to 6 mph SSW 1%
Friday 89°F Mostly Sunny 1 to 7 mph NNW 1%

Forecast source: National Weather Service (api.weather.gov) for Williams (39.150, -122.139). Updated through the day.

Growing snapshot for Williams

Last spring frost
Feb 14
First fall frost
Dec 1
Growing season
293 days
Hardiness zone
9b

More local growing data for Williams: nearby ZIP 95987 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, Colusa 2 Ssw, Ca (13.1 mi from Williams). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.