Pittsburg, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pittsburg, a city in Contra Costa County, California.
Today
102°F
Sunny
Sunny. High near 102, with temperatures falling to around 99 in the afternoon. West wind around 14 mph, with gusts as high as 22 mph.
7-day forecast for Pittsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 102°F | Sunny | 14 mph W | 0% |
| Tonight | 63°F | Clear | 15 mph WSW | 0% |
| Wednesday | 96°F | Sunny | 14 mph W | 0% |
| Wednesday Night | 63°F | Clear | 14 mph WSW | 0% |
| Thursday | 94°F | Sunny | 13 mph W | 0% |
| Thursday Night | 65°F | Clear | 14 mph WSW | 0% |
| Friday | 99°F | Sunny | 10 to 14 mph WSW | 0% |
| Friday Night | 65°F | Clear | 14 mph WSW | 0% |
| Saturday | 95°F | Sunny | 9 to 14 mph WSW | 0% |
| Saturday Night | 67°F | Mostly Clear | 14 mph WSW | 0% |
| Sunday | 91°F | Sunny | 12 to 15 mph WSW | 0% |
| Sunday Night | 63°F | Mostly Clear | 17 mph WSW | 0% |
| Monday | 85°F | Sunny | 13 to 17 mph WSW | 0% |
| Monday Night | 61°F | Mostly Clear | 16 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 Aug 4, 2026.