Knightsen, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knightsen, a community in Contra Costa County, California.
Overnight
62°F
Clear
Clear. Low around 62, with temperatures rising to around 64 overnight. Northwest wind around 5 mph.
7-day forecast for Knightsen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Clear | 5 mph NW | 0% |
| Tuesday | 105°F | Sunny | 5 to 13 mph WNW | 0% |
| Tuesday Night | 62°F | Clear | 3 to 12 mph WNW | 0% |
| Wednesday | 101°F | Sunny | 3 to 12 mph WNW | 0% |
| Wednesday Night | 61°F | Clear | 3 to 12 mph W | 0% |
| Thursday | 99°F | Sunny | 3 to 13 mph W | 0% |
| Thursday Night | 63°F | Clear | 3 to 13 mph W | 0% |
| Friday | 103°F | Sunny | 3 to 12 mph W | 0% |
| Friday Night | 65°F | Clear | 3 to 12 mph W | 0% |
| Saturday | 102°F | Sunny | 3 to 12 mph W | 0% |
| Saturday Night | 66°F | Clear | 2 to 12 mph W | 0% |
| Sunday | 99°F | Sunny | 3 to 12 mph W | 0% |
| Sunday Night | 62°F | Clear | 3 to 12 mph WSW | 0% |
| Monday | 94°F | Sunny | 3 to 12 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 Aug 4, 2026.