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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.

Tonight
56°F
Partly Cloudy then Patchy Fog
Patchy fog after 4am. Partly cloudy, with a low around 56. South southwest wind 1 to 7 mph.

7-day forecast for Los Altos

WhenTempForecastWindPrecip
Tonight 56°F Partly Cloudy then Patchy Fog 1 to 7 mph SSW 0%
Saturday 83°F Patchy Fog then Mostly Sunny 1 to 8 mph NE 0%
Saturday Night 57°F Mostly Cloudy 2 to 7 mph WNW 0%
Sunday 77°F Mostly Cloudy 2 to 7 mph W 3%
Sunday Night 57°F Mostly Cloudy then Patchy Fog 1 to 7 mph W 3%
Monday 80°F Patchy Fog then Mostly Sunny 1 to 7 mph W 0%
Monday Night 57°F Partly Cloudy 1 to 7 mph W 0%
Tuesday 83°F Sunny 1 to 7 mph WSW 0%
Tuesday Night 58°F Mostly Clear 0 to 7 mph WSW 0%
Wednesday 91°F Sunny 0 to 7 mph W 0%
Wednesday Night 62°F Mostly Clear 0 to 7 mph NW 0%
Thursday 92°F Sunny 0 to 7 mph NW 0%
Thursday Night 62°F Mostly Clear 1 to 7 mph W 0%
Friday 86°F Sunny 1 to 8 mph W 0%

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

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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.