Los Altos, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Los Altos, a city in Santa Clara County, California.
Today
83°F
Sunny
Sunny. High near 83, with temperatures falling to around 79 in the afternoon. North wind 1 to 9 mph.
7-day forecast for Los Altos
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 1 to 9 mph N | 0% |
| Tonight | 57°F | Mostly Cloudy | 2 to 7 mph NNE | 0% |
| Sunday | 76°F | Mostly Cloudy | 2 to 7 mph N | 1% |
| Sunday Night | 56°F | Mostly Cloudy | 2 to 6 mph W | 1% |
| Monday | 78°F | Mostly Sunny | 2 to 7 mph WSW | 0% |
| Monday Night | 56°F | Partly Cloudy | 2 to 7 mph WSW | 0% |
| Tuesday | 80°F | Sunny | 2 to 7 mph WSW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 0 to 7 mph WSW | 0% |
| Wednesday | 88°F | Sunny | 0 to 7 mph WNW | 0% |
| Wednesday Night | 61°F | Mostly Clear | 0 to 7 mph NW | 0% |
| Thursday | 91°F | Sunny | 0 to 8 mph NW | 0% |
| Thursday Night | 61°F | Mostly Clear | 1 to 8 mph W | 0% |
| Friday | 85°F | Mostly Sunny | 1 to 8 mph W | 0% |
| Friday Night | 58°F | Partly Cloudy | 2 to 8 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Los Altos (37.368, -122.097). Updated through the day.
Growing snapshot for Los Altos
Last spring frost
Jan 6
First fall frost
Dec 23
Growing season
353 days
Hardiness zone
9b
More local growing data for Los Altos: nearby ZIP 94040 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Alum Rock
Burbank
Cambrian Park
Campbell
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East Foothills
East Palo Alto
Fruitdale
Gilroy
Los Altos Hills
Los Gatos
Loyola
Menlo Park
Milpitas
Monte Sereno
Morgan Hill
Mountain View
Palo Alto
San Jose
San Martin
Santa Clara
Saratoga
Stanford
Sunnyvale
Climate data from the nearest NOAA station, Moffett Federal Airfield, Ca (2.7 mi from Los Altos). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.