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.
This Afternoon
63°F
Slight Chance Light Rain
A slight chance of rain. Mostly sunny. High near 63, with temperatures falling to around 58 in the afternoon. East southeast wind around 2 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Discovery Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 63°F | Slight Chance Light Rain | 2 mph ESE | 19% |
| Tonight | 49°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 5 mph N | 21% |
| Wednesday | 69°F | Sunny | 7 mph NW | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 5 mph W | 0% |
| Thursday | 72°F | Sunny | 2 to 7 mph WNW | 0% |
| Thursday Night | 48°F | Clear | 3 mph W | 0% |
| Friday | 73°F | Sunny | 0 to 5 mph NW | 0% |
| Friday Night | 49°F | Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 2 mph NNE | 0% |
| Saturday Night | 50°F | Mostly Clear | 1 mph NW | 0% |
| Sunday | 74°F | Mostly Sunny | 3 mph WNW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 2 mph NW | 0% |
| Monday | 73°F | Mostly Sunny | 0 to 3 mph W | 0% |
| Monday Night | 51°F | Partly Cloudy | 3 mph W | 1% |
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
Nearby towns & communities
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Castle Hill
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Clyde
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Contra Costa Centre
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East Richmond Heights
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Mountain View
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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 Nov 4, 2026.