Pittsburg, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pittsburg, a city in Contra Costa County, California.
This Afternoon
62°F
Chance Light Rain
A chance of rain. Partly sunny. High near 62, with temperatures falling to around 57 in the afternoon. East southeast wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Pittsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Chance Light Rain | 5 mph ESE | 33% |
| Tonight | 51°F | Chance Light Rain then Mostly Cloudy | 2 to 7 mph NE | 38% |
| Wednesday | 67°F | Sunny | 3 to 7 mph NW | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 7 mph WSW | 0% |
| Thursday | 71°F | Sunny | 5 mph WNW | 0% |
| Thursday Night | 52°F | Mostly Clear | 5 mph W | 0% |
| Friday | 71°F | Sunny | 3 mph NNW | 0% |
| Friday Night | 52°F | Clear | 1 mph NW | 0% |
| Saturday | 70°F | Sunny | 0 to 5 mph NE | 0% |
| Saturday Night | 53°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 70°F | Mostly Sunny | 1 to 5 mph W | 0% |
| Sunday Night | 54°F | Partly Cloudy | 0 to 3 mph WSW | 0% |
| Monday | 69°F | Partly Sunny | 5 mph WSW | 1% |
| Monday Night | 54°F | Partly Cloudy | 3 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Pittsburg (38.017, -121.897). Updated through the day.
Growing snapshot for Pittsburg
Last spring frost
Jan 9
First fall frost
Dec 14
Growing season
343 days
Hardiness zone
9b
More local growing data for Pittsburg: nearby ZIP 94565 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Concord Buchanan Fld, Ca (7 mi from Pittsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.