Williams, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williams, a city in Colusa County, California.
Tonight
57°F
Clear
Clear. Low around 57, with temperatures rising to around 59 overnight. West wind around 2 mph.
7-day forecast for Williams
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Clear | 2 mph W | 0% |
| Saturday | 91°F | Sunny | 1 to 5 mph NNW | 0% |
| Saturday Night | 58°F | Partly Cloudy | 2 mph ESE | 0% |
| Sunday | 87°F | Partly Sunny | 1 to 5 mph ENE | 0% |
| Sunday Night | 56°F | Partly Cloudy | 0 to 5 mph ESE | 0% |
| Monday | 90°F | Mostly Sunny | 1 to 5 mph ESE | 0% |
| Monday Night | 58°F | Mostly Clear | 0 to 5 mph ESE | 0% |
| Tuesday | 91°F | Sunny | 1 to 5 mph ENE | 0% |
| Tuesday Night | 59°F | Mostly Clear | 0 to 5 mph ENE | 0% |
| Wednesday | 92°F | Sunny | 3 mph NNE | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 3 mph ENE | 0% |
| Thursday | 94°F | Sunny | 1 to 6 mph N | 0% |
| Thursday Night | 61°F | Mostly Clear | 1 to 6 mph SSW | 0% |
| Friday | 91°F | Sunny | 1 to 7 mph S | 0% |
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
Nearby towns & communities
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.