Knightsen, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knightsen, a community in Contra Costa County, California.
Overnight
49°F
Partly Cloudy
Partly cloudy, with a low around 49. Northwest wind around 6 mph.
7-day forecast for Knightsen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Partly Cloudy | 6 mph NW | 0% |
| Wednesday | 69°F | Sunny | 5 to 10 mph NW | 1% |
| Wednesday Night | 49°F | Mostly Cloudy | 5 mph W | 1% |
| Thursday | 73°F | Mostly Sunny | 3 to 8 mph NW | 0% |
| Thursday Night | 47°F | Clear | 1 to 5 mph W | 0% |
| Friday | 72°F | Sunny | 0 to 5 mph NW | 0% |
| Friday Night | 48°F | Mostly Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 0 to 3 mph NNE | 0% |
| Saturday Night | 50°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 73°F | Sunny | 5 mph NW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 2 mph NNW | 0% |
| Monday | 72°F | Mostly Sunny | 0 to 3 mph WNW | 0% |
| Monday Night | 50°F | Partly Cloudy | 0 to 3 mph W | 1% |
| Tuesday | 73°F | Sunny | 2 mph WNW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Knightsen (37.962, -121.649). Updated through the day.
Growing snapshot for Knightsen
Last spring frost
Jan 12
First fall frost
Dec 19
Growing season
343 days
Hardiness zone
9b
More local growing data for Knightsen: nearby ZIP 94548 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Antioch Pumping Plt #3, Ca (5.5 mi from Knightsen). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.