Williams, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williams, a city in Colusa County, California.
Today
100°F
Sunny
Sunny. High near 100, with temperatures falling to around 98 in the afternoon. East southeast wind 2 to 7 mph.
7-day forecast for Williams
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Sunny | 2 to 7 mph ESE | 0% |
| Tonight | 63°F | Mostly Clear | 1 to 6 mph SSE | 0% |
| Wednesday | 98°F | Sunny | 1 to 7 mph ESE | 0% |
| Wednesday Night | 63°F | Clear | 1 to 7 mph SSE | 0% |
| Thursday | 98°F | Sunny | 1 to 7 mph ESE | 0% |
| Thursday Night | 64°F | Clear | 1 to 7 mph SSE | 0% |
| Friday | 98°F | Sunny | 1 to 6 mph ENE | 0% |
| Friday Night | 66°F | Clear | 1 to 6 mph SSE | 0% |
| Saturday | 99°F | Sunny | 1 to 7 mph NE | 0% |
| Saturday Night | 66°F | Clear | 1 to 7 mph SSE | 0% |
| Sunday | 97°F | Sunny | 1 to 8 mph ENE | 0% |
| Sunday Night | 62°F | Clear | 1 to 8 mph ESE | 0% |
| Monday | 93°F | Sunny | 1 to 9 mph ESE | 0% |
| Monday Night | 59°F | Mostly Clear | 1 to 9 mph ESE | 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 Aug 4, 2026.