Alamo, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alamo, a community in Contra Costa County, California.
This Afternoon
61°F
Light Rain
Rain. Mostly cloudy. High near 61, with temperatures falling to around 56 in the afternoon. South wind 1 to 6 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Alamo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Light Rain | 1 to 6 mph S | 79% |
| Tonight | 46°F | Chance Light Rain then Mostly Cloudy | 1 to 5 mph ENE | 43% |
| Wednesday | 66°F | Sunny | 2 to 6 mph NNW | 1% |
| Wednesday Night | 46°F | Partly Cloudy then Patchy Fog | 3 mph W | 0% |
| Thursday | 71°F | Patchy Fog then Sunny | 1 to 5 mph NNW | 0% |
| Thursday Night | 46°F | Mostly Clear | 2 mph WSW | 0% |
| Friday | 73°F | Sunny | 3 mph NNE | 0% |
| Friday Night | 48°F | Clear | 2 mph N | 0% |
| Saturday | 74°F | Sunny | 3 mph NE | 0% |
| Saturday Night | 49°F | Mostly Clear | 2 mph NNW | 0% |
| Sunday | 74°F | Mostly Sunny | 3 mph WNW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 2 mph W | 0% |
| Monday | 71°F | Partly Sunny | 3 mph SW | 1% |
| Monday Night | 49°F | Partly Cloudy | 0 to 3 mph SW | 1% |
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
Nearby towns & communities
Acalanes Ridge
Alhambra Valley
Antioch
Bay Point
Bayview
Benicia
Bethel Island
Blackhawk
Brentwood
Byron
Castle Hill
Clayton
Clyde
Concord
Contra Costa Centre
Crockett
Danville
Diablo
Discovery Bay
East Richmond Heights
El Cerrito
El Sobrante
Hercules
Knightsen
Lafayette
Martinez
Montalvin Manor
Moraga
Mountain View
Norris Canyon
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 Nov 4, 2026.