Princeton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Princeton, a community in Colusa County, California.
This Afternoon
56°F
Haze
Haze and rain likely. Mostly cloudy, with a high near 56. North northeast wind 2 to 7 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Princeton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Haze | 2 to 7 mph NNE | 65% |
| Tonight | 44°F | Partly Cloudy | 6 mph NNW | 8% |
| Wednesday | 68°F | Sunny | 1 to 9 mph NW | 0% |
| Wednesday Night | 45°F | Patchy Fog | 0 to 3 mph NW | 0% |
| Thursday | 72°F | Sunny | 3 to 8 mph NNW | 0% |
| Thursday Night | 44°F | Mostly Clear | 3 mph NNW | 0% |
| Friday | 72°F | Sunny | 0 to 3 mph N | 0% |
| Friday Night | 43°F | Mostly Clear | 1 mph NNE | 0% |
| Saturday | 72°F | Sunny | 2 mph ENE | 0% |
| Saturday Night | 44°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 71°F | Mostly Sunny | 3 mph NNW | 0% |
| Sunday Night | 46°F | Partly Cloudy | 1 mph E | 1% |
| Monday | 70°F | Mostly Sunny | 2 mph NNE | 2% |
| Monday Night | 46°F | Partly Cloudy | 2 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov) for Princeton (39.402, -122.019). Updated through the day.
Growing snapshot for Princeton
Last spring frost
Feb 14
First fall frost
Dec 1
Growing season
293 days
Hardiness zone
9b
More local growing data for Princeton: nearby ZIP 95970 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Colusa 2 Ssw, Ca (15.5 mi from Princeton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.