California · NWS MTR office

Los Altos, CA weather

It is 46°F at LOS ALTOS as of Oct 28, 1:10 AM PDT. Overnight: Partly Cloudy, low near 47°F. Forecast from the National Weather Service, issued Oct 28, 2:16 AM PDT.

Updated Oct 28, 2:25 AM PDT (snapshot)

Current conditions

Temperature

46°F

Partly Cloudy

Wind

SW 3 mph

Humidity 82% · dew point 41°F

Pressure · visibility

—

Visibility —

Observed at LOS ALTOS (LOAC1), Oct 28, 1:10 AM PDT. Station readings can lag or be missing.

Alerts for this area

Coastal Flood Advisory Minor Expected

Coastal Flood Advisory issued October 28 at 12:20AM PDT until October 31 at 6:00PM PDT by NWS San Francisco CA

Area
San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
In effect
Oct 28, 12:20 AM PDT
Until
Oct 31, 6:00 PM PDT
Issued by
NWS San Francisco CA
Full text

* WHAT...Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Bay Shoreline locations of San Pablo Bay, San Francisco Bay, and Monterey Bay. * WHEN...Until 6 PM PDT Saturday. * IMPACTS...High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. More substantial impacts are expected along bayshore Marin County where increased flooding is anticipated across low lying areas. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.9 ft above normal (7.7 ft MLLW) at 12:56 PM Wednesday 10/28, 1.9 ft above normal (7.7 ft MLLW) at 01:43 PM Thursday 10/29, 1.6 ft above normal (7.4 ft MLLW) at 02:39 PM Friday 10/30, and 1.1 feet above normal (6.9 ft MLLW) at 03:44 PM on Saturday 10/31. These predictions include up to 1.2 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

What to do: If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

Around the NWS MTR forecast area

2 active alerts cover zones served by the MTR office near Los Altos:

  • Coastal Flood Advisory (2)

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. California has 8 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Los Altos (local time)
TimeTempForecastPrecip. chanceWind
Wed 2 AM50°FPartly Cloudy0%W 1 mph
Wed 3 AM49°FPartly Cloudy0%W 1 mph
Wed 4 AM48°FPartly Cloudy0%WSW 1 mph
Wed 5 AM47°FPartly Cloudy0%W 1 mph
Wed 6 AM47°FMostly Sunny0%W 1 mph
Wed 7 AM47°FPatchy Fog0%WSW 1 mph
Wed 8 AM47°FPatchy Fog0%WSW 2 mph
Wed 9 AM52°FMostly Sunny0%W 2 mph
Wed 10 AM57°FSunny0%N 2 mph
Wed 11 AM61°FSunny0%N 5 mph
Wed 12 PM64°FSunny0%NNW 5 mph
Wed 1 PM67°FSunny0%NNW 6 mph
Wed 2 PM68°FSunny0%NNW 7 mph
Wed 3 PM68°FMostly Sunny0%NNW 7 mph
Wed 4 PM68°FMostly Sunny0%NNW 7 mph
Wed 5 PM68°FMostly Sunny0%NW 5 mph
Wed 6 PM65°FPartly Cloudy0%NW 5 mph
Wed 7 PM62°FPartly Cloudy0%NW 5 mph
Wed 8 PM58°FMostly Cloudy0%WNW 1 mph
Wed 9 PM56°FMostly Cloudy0%WNW 1 mph
Wed 10 PM55°FMostly Cloudy0%WNW 1 mph
Wed 11 PM54°FCloudy0%S 1 mph
Thu 12 AM54°FCloudy0%S 1 mph
Thu 1 AM53°FCloudy0%S 1 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Los Altos can differ.

7-day forecast

Overnight

Low 47°F

Partly cloudy, with a low around 47. West southwest wind around 1 mph.

Wednesday

High 69°F·Low 50°F

Mostly sunny, with a high near 69. North northwest wind 1 to 7 mph.

Wednesday Night: Mostly cloudy, with a low around 50. South southwest wind 0 to 5 mph.

Thursday

High 70°F·Low 49°F

Mostly cloudy, with a high near 70. West wind 0 to 3 mph.

Thursday Night: Mostly cloudy, with a low around 49. West southwest wind around 3 mph.

Friday

High 67°F·Low 47°F

Patchy fog between 7am and 9am. Mostly sunny, with a high near 67.

Friday Night: Partly cloudy, with a low around 47.

Saturday

High 64°F·Low 47°F

Mostly cloudy, with a high near 64.

Saturday Night: A slight chance of rain between 11pm and 4am. Partly cloudy, with a low around 47.

Sunday

High 66°F·Low 48°F

Sunny, with a high near 66.

Sunday Night: Mostly clear, with a low around 48.

Monday

High 71°F·Low 51°F

Mostly sunny, with a high near 71.

Monday Night: Mostly cloudy, with a low around 51.

Tuesday

High 71°F

A chance of rain after 10am. Mostly sunny, with a high near 71.

Nearby cities

Larger cities in the area

Other cities in Santa Clara County

See every city we cover in California, or check all active alerts.

About this forecast

Forecast office
Los Altos is served by the National Weather Service MTR forecast office, forecast zone CAZ508, county zone CAC085.
Location used
The Census Bureau's internal point for Los Altos (37.3684, -122.0966), in Santa Clara County. Population: 30,864 (2024 estimate), number 241 of the 296 California cities on this site.
Radar
Nearest NWS radar: KMUX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/37.3684,-122.0966 (forecast issued Oct 28, 2:16 AM PDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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