Los Alamos, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Los Alamos, a community in Santa Barbara County, California.
This Afternoon
80°F
Sunny
Sunny, with a high near 80. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Los Alamos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Sunny | 10 to 15 mph NW | 0% |
| Tonight | 54°F | Patchy Fog | 5 to 10 mph NW | 0% |
| Saturday | 82°F | Patchy Fog then Mostly Sunny | 5 to 10 mph WNW | 0% |
| Saturday Night | 56°F | Patchy Fog | 0 to 10 mph NNW | 0% |
| Sunday | 79°F | Patchy Fog then Partly Sunny | 0 to 10 mph WNW | 1% |
| Sunday Night | 54°F | Patchy Fog | 5 to 10 mph NW | 1% |
| Monday | 75°F | Patchy Fog then Mostly Sunny | 5 to 15 mph NW | 0% |
| Monday Night | 54°F | Partly Cloudy | 0 to 10 mph NW | 0% |
| Tuesday | 80°F | Mostly Sunny | 0 to 10 mph NW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 0 to 10 mph NNW | 0% |
| Wednesday | 90°F | Sunny | 0 to 10 mph WNW | 0% |
| Wednesday Night | 62°F | Mostly Clear | 0 to 10 mph NNE | 0% |
| Thursday | 90°F | Mostly Sunny | 0 to 10 mph SSW | 0% |
| Thursday Night | 62°F | Partly Cloudy | 0 to 10 mph NNE | 0% |
Forecast source: National Weather Service (api.weather.gov) for Los Alamos (34.742, -120.275). Updated through the day.
Growing snapshot for Los Alamos
Last spring frost
Jan 20
First fall frost
Dec 19
Growing season
335 days
Hardiness zone
9b
More local growing data for Los Alamos: nearby ZIP 93440 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Lompoc, Ca (13.5 mi from Los Alamos). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.