Blackhawk, CA Weather & Growing Conditions
Overnight
55°F
Patchy Fog
Patchy fog after 3am. Partly cloudy, with a low around 55. Southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Patchy Fog | 2 mph SW | 0% |
| Saturday | 85°F | Patchy Fog then Sunny | 2 to 7 mph SW | 0% |
| Saturday Night | 54°F | Partly Cloudy | 2 to 6 mph SW | 0% |
| Sunday | 76°F | Mostly Cloudy | 2 to 7 mph WSW | 3% |
| Sunday Night | 54°F | Mostly Cloudy | 2 to 7 mph WSW | 3% |
| Monday | 78°F | Mostly Sunny | 3 to 8 mph WSW | 0% |
| Monday Night | 54°F | Partly Cloudy | 1 to 8 mph WSW | 0% |
| Tuesday | 82°F | Patchy Fog then Sunny | 1 to 7 mph WSW | 0% |
| Tuesday Night | 54°F | Mostly Clear | 0 to 7 mph SW | 0% |
| Wednesday | 92°F | Sunny | 0 to 6 mph WNW | 0% |
| Wednesday Night | 60°F | Mostly Clear | 0 to 6 mph W | 0% |
| Thursday | 93°F | Sunny | 0 to 7 mph WSW | 0% |
| Thursday Night | 58°F | Mostly Clear | 1 to 7 mph WSW | 0% |
| Friday | 85°F | Mostly Sunny | 1 to 8 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Blackhawk, CA
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
Explore more for Blackhawk, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.