TODAY NOV21
TEMPERATURE57
HUMIDITY74
PRESSURE
WIND COND.1 9.6
  • 6451Fri90%100%
  • 6245Sat60%40%
  • 6048Sun60%
  • 6348Mon
  • 6346Tue
daynightWeather update from LOS ALTOS at
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Weather Quick Facts

  • The highest monthly average temperature in Los Altos for July is 66.7 degrees
  • The lowest monthly average temperature in Los Altos for January is 50.4 degrees
  • The most monthly precipitation in Los Altos occurs in December with 2.6 inches
  • The air quality index in Los Altos is 2% worse than the national average
  • The pollution index in Los Altos is 321% worse than the national average

Compare Los Altos, CA Weather

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      Los Altos Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January42°F61°F50°F2.4"
      February45°F63°F53°F2.4"
      March47°F67°F56°F2.0"
      April49°F70°F58°F1.3"
      May53°F73°F61°F0.3"
      June56°F77°F65°F0.2"
      July59°F78°F67°F0.0"
      August59°F78°F66°F0.0"
      September57°F80°F67°F0.1"
      October53°F75°F63°F0.7"
      November47°F67°F56°F1.3"
      December42°F60°F51°F2.6"

      Los Altos air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexLos AltosCaliforniaNational
      Air quality index435542
      Pollution index11,477,20010,473,1902,726,193

      Los Altos air quality

      MeasurementTotal
      Days measured365
      Days with good air quality263
      Days with moderate air quality98
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.070%
      Benzene0.110%
      Carbon Tetrachloride0.000%
      Lead0.160%
      Mercury0.090%

      Average monthly Los Altos temperature with heat index

      Los Altos monthly precipitation with daily maximum

      Los Altos monthly snow depth with daily maximum

      Los Altos monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Lexington Hills, CA2,6563530.0%
      Loma Mar, CA2823530.0%
      Saratoga, CA31,0844314.0%
      Belmont, CA26,9634314.0%
      Hillsborough, CA11,6084314.0%
      Los Altos, CA30,8784314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Fair Oaks, CA30,882524.0%
      Sterling, VA30,872476.0%
      Centre Wellington, ON30,896n/a 
      Algonquin, IL30,8484216.0%
      Cleburne, TX30,8123334.0%
      Los Altos, CA30,8784314.0%
      Source: The Los Altos, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.