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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.

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

WhenTempForecastWindPrecip
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

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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.