Alamo, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alamo, a community in Contra Costa County, California.
Today
101°F
Sunny
Sunny. High near 101, with temperatures falling to around 97 in the afternoon. Southwest wind 3 to 7 mph.
7-day forecast for Alamo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 101°F | Sunny | 3 to 7 mph SW | 0% |
| Tonight | 58°F | Clear | 6 mph SSW | 0% |
| Wednesday | 96°F | Sunny | 7 mph SW | 0% |
| Wednesday Night | 59°F | Clear | 6 mph WSW | 0% |
| Thursday | 94°F | Sunny | 3 to 7 mph WSW | 0% |
| Thursday Night | 60°F | Clear | 7 mph WSW | 0% |
| Friday | 98°F | Sunny | 3 to 7 mph WSW | 0% |
| Friday Night | 62°F | Clear | 7 mph WSW | 0% |
| Saturday | 98°F | Sunny | 3 to 7 mph WSW | 0% |
| Saturday Night | 63°F | Mostly Clear | 7 mph SW | 0% |
| Sunday | 92°F | Sunny | 6 to 9 mph SW | 0% |
| Sunday Night | 59°F | Mostly Clear | 9 mph SW | 0% |
| Monday | 86°F | Sunny | 9 mph SW | 0% |
| Monday Night | 57°F | Mostly Clear | 7 to 10 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Alamo (37.855, -122.014). Updated through the day.
Growing snapshot for Alamo
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
More local growing data for Alamo: nearby ZIP 94507 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (4.5 mi from Alamo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.