Williams, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williams, a city in Colusa County, California.
Today
55°F
Light Rain
Rain before 1pm, then haze and rain likely. Mostly cloudy, with a high near 55. Northeast wind 2 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Williams
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 55°F | Light Rain | 2 to 6 mph NE | 76% |
| Tonight | 46°F | Slight Chance Light Rain then Partly Cloudy | 6 mph NNW | 19% |
| Wednesday | 68°F | Sunny | 2 to 8 mph NW | 0% |
| Wednesday Night | 46°F | Patchy Fog | 2 mph WNW | 0% |
| Thursday | 72°F | Sunny | 2 to 8 mph NNW | 0% |
| Thursday Night | 45°F | Mostly Clear | 3 mph NW | 0% |
| Friday | 73°F | Sunny | 3 mph NNW | 0% |
| Friday Night | 46°F | Mostly Clear | 1 mph N | 0% |
| Saturday | 72°F | Sunny | 2 mph ENE | 0% |
| Saturday Night | 47°F | Mostly Clear | 2 mph N | 0% |
| Sunday | 72°F | Mostly Sunny | 3 mph N | 0% |
| Sunday Night | 47°F | Partly Cloudy | 1 mph NE | 0% |
| Monday | 70°F | Mostly Sunny | 2 mph NNE | 1% |
| Monday Night | 48°F | Partly Cloudy | 2 mph N | 2% |
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 Nov 3, 2026.