Discovery Bay, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Discovery Bay, a community in Contra Costa County, California.
Overnight
58°F
Clear
Clear, with a low around 58. Southwest wind around 3 mph.
7-day forecast for Discovery Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Clear | 3 mph SW | 0% |
| Saturday | 92°F | Sunny | 2 to 7 mph W | 0% |
| Saturday Night | 58°F | Partly Cloudy | 2 to 6 mph WSW | 0% |
| Sunday | 85°F | Mostly Cloudy | 3 to 7 mph W | 0% |
| Sunday Night | 57°F | Mostly Cloudy | 3 to 7 mph WSW | 0% |
| Monday | 88°F | Sunny | 3 to 8 mph W | 0% |
| Monday Night | 57°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Tuesday | 90°F | Sunny | 2 to 7 mph W | 0% |
| Tuesday Night | 59°F | Clear | 1 to 7 mph W | 0% |
| Wednesday | 96°F | Sunny | 3 mph NW | 0% |
| Wednesday Night | 63°F | Mostly Clear | 0 to 3 mph NW | 0% |
| Thursday | 98°F | Sunny | 0 to 6 mph NW | 0% |
| Thursday Night | 63°F | Mostly Clear | 2 to 6 mph W | 1% |
| Friday | 92°F | Sunny | 2 to 8 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Discovery Bay (37.908, -121.597). Updated through the day.
Growing snapshot for Discovery Bay
Last spring frost
Jan 19
First fall frost
Dec 10
Growing season
330 days
Hardiness zone
9b
More local growing data for Discovery Bay: nearby ZIP 94505 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Tracy Pumping Plt, Ca (5.3 mi from Discovery Bay). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.