Knightsen, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knightsen, a community in Contra Costa County, California.
This Afternoon
87°F
Sunny
Sunny, with a high near 87. West northwest wind around 9 mph.
7-day forecast for Knightsen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 87°F | Sunny | 9 mph WNW | 0% |
| Tonight | 57°F | Clear | 2 to 9 mph WSW | 0% |
| Saturday | 91°F | Sunny | 2 to 8 mph WNW | 0% |
| Saturday Night | 59°F | Partly Cloudy | 2 to 7 mph WSW | 0% |
| Sunday | 85°F | Partly Sunny | 3 to 8 mph W | 0% |
| Sunday Night | 58°F | Mostly Cloudy | 3 to 8 mph WSW | 0% |
| Monday | 87°F | Sunny | 3 to 9 mph W | 0% |
| Monday Night | 58°F | Mostly Clear | 2 to 9 mph WSW | 0% |
| Tuesday | 90°F | Sunny | 2 to 8 mph W | 0% |
| Tuesday Night | 59°F | Clear | 0 to 8 mph W | 0% |
| Wednesday | 97°F | Sunny | 0 to 5 mph NW | 0% |
| Wednesday Night | 64°F | Mostly Clear | 0 to 5 mph WNW | 0% |
| Thursday | 98°F | Sunny | 0 to 7 mph WNW | 0% |
| Thursday Night | 64°F | Mostly Clear | 2 to 7 mph W | 0% |
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 Sep 19, 2026.