Pittsburg, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pittsburg, a city in Contra Costa County, California.
Tonight
61°F
Clear
Clear, with a low around 61. Southwest wind around 12 mph, with gusts as high as 21 mph.
7-day forecast for Pittsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Clear | 12 mph SW | 0% |
| Saturday | 89°F | Sunny | 7 to 10 mph WSW | 0% |
| Saturday Night | 62°F | Partly Cloudy | 12 mph WSW | 0% |
| Sunday | 81°F | Partly Sunny | 10 mph WSW | 0% |
| Sunday Night | 61°F | Partly Cloudy | 10 to 14 mph WSW | 0% |
| Monday | 83°F | Sunny | 14 mph WSW | 0% |
| Monday Night | 60°F | Mostly Clear | 10 to 14 mph WSW | 0% |
| Tuesday | 84°F | Sunny | 7 to 10 mph WSW | 0% |
| Tuesday Night | 61°F | Mostly Clear | 2 to 10 mph WSW | 0% |
| Wednesday | 93°F | Sunny | 5 mph WNW | 0% |
| Wednesday Night | 65°F | Mostly Clear | 6 mph WSW | 0% |
| Thursday | 93°F | Sunny | 2 to 9 mph W | 0% |
| Thursday Night | 66°F | Mostly Clear | 12 mph WSW | 0% |
| Friday | 87°F | Sunny | 12 mph WSW | 0% |
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 Sep 19, 2026.