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.
Today
83°F
Patchy Fog then Mostly Sunny
Patchy fog before 11am. Mostly sunny, with a high near 83. West southwest wind 0 to 10 mph.
7-day forecast for Los Alamos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Patchy Fog then Mostly Sunny | 0 to 10 mph WSW | 0% |
| Tonight | 56°F | Patchy Fog | 0 to 10 mph NNW | 0% |
| Wednesday | 82°F | Patchy Fog then Mostly Sunny | 0 to 10 mph WNW | 0% |
| Wednesday Night | 56°F | Patchy Fog | 0 to 10 mph NW | 0% |
| Thursday | 81°F | Patchy Fog then Mostly Sunny | 0 to 10 mph WNW | 0% |
| Thursday Night | 59°F | Patchy Fog | 0 to 10 mph NNW | 0% |
| Friday | 87°F | Patchy Fog then Mostly Sunny | 0 to 10 mph WNW | 0% |
| Friday Night | 60°F | Mostly Clear | 0 to 10 mph NNW | 0% |
| Saturday | 89°F | Sunny | 0 to 10 mph WSW | 0% |
| Saturday Night | 61°F | Mostly Clear | 0 to 10 mph NW | 0% |
| Sunday | 88°F | Sunny | 0 to 10 mph SW | 0% |
| Sunday Night | 58°F | Partly Cloudy | 0 to 10 mph NW | 1% |
| Monday | 84°F | Sunny | 0 to 10 mph WSW | 1% |
| Monday Night | 57°F | Partly Cloudy | 0 to 10 mph NW | 3% |
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 Aug 4, 2026.