TODAY DEC23
TEMPERATURE56
HUMIDITY100
PRESSURE102100
WIND COND.20 7.6
  • 6651Mon20%
  • 5944Tue100%
  • 574620%
  • 6050Thu
  • 6153Fri
daynightWeather update from San Francisco, San Francisco International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Western Hills for September is 63.3 degrees
  • The lowest monthly average temperature in Western Hills for January is 50.7 degrees
  • The most monthly precipitation in Western Hills occurs in December with 4.4 inches
  • The air quality index in Western Hills is 2% worse than the national average
  • The pollution index in Western Hills is 254% worse than the national average

Compare San Mateo, CA Weather

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      Western Hills 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
      January44°F58°F51°F3.2"
      February46°F62°F53°F3.4"
      March47°F64°F54°F2.7"
      April49°F67°F56°F1.7"
      May51°F69°F58°F0.3"
      June54°F72°F61°F0.2"
      July56°F73°F62°F0.0"
      August56°F73°F62°F0.0"
      September56°F76°F63°F0.1"
      October54°F73°F62°F1.0"
      November49°F65°F56°F1.7"
      December44°F58°F51°F4.4"

      Western Hills 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.
      IndexWestern HillsSan MateoCalifornia
      Air quality index434355
      Pollution index9,645,6109,645,61010,473,190

      Western Hills 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
      Arsenic0.140%
      Benzene0.070%
      Carbon Tetrachloride0.000%
      Lead0.100%
      Mercury0.020%

      Average monthly Western Hills temperature with heat index

      Western Hills monthly precipitation with daily maximum

      Western Hills monthly snow depth with daily maximum

      Western Hills monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      South San Francisco, CA66,8784020.0%
      Alameda, CA79,8274020.0%
      San Leandro, CA90,4894020.0%
      Colma, CA1,4924020.0%
      Ashland, CA23,5664020.0%
      San Mateo, CA103,6194314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Rialto, CA103,5498978.0%
      Burbank, CA103,4117244.0%
      El Cajon, CA103,2496428.0%
      Allen, TX104,040512.0%
      Las Cruces, NM102,950512.0%
      San Mateo, CA103,6194314.0%
      Source: The Western Hills, San Mateo, 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.