TODAY MAY30
TEMPERATURE61
HUMIDITY83
PRESSURE29.92
WIND COND.150 8.1
  • 6255Sun
  • 6356Mon
  • 6858Tue
  • 7057Wed
  • 6455Thu
daynightWeather update from San Francisco, San Francisco International Airport at
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Foster City 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"

Did you know?

  • The highest monthly average temperature in Foster City for September is 63 degrees.
  • The lowest monthly average temperature in Foster City for January is 51 degrees.
  • The most monthly precipitation in Foster City occurs in December with 4.4 inches.
  • The air quality index in Foster City is 3% better than the national average.
  • The pollution index in Foster City is 90% worse than the national average.

Compare Foster City, CA Weather To Other Cities

      vs

      Foster City 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.
      IndexFoster CityCaliforniaNational
      Air quality index485550
      Pollution index9,645,61018,106,7265,066,862

      Foster City air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality204
      Days with moderate air quality153
      Days w/ poor A.Q. for sensitive groups7
      Days with unhealthy air quality1

      Foster City air quality information

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

      Average monthly Foster City temperature with heat index

      Foster City monthly precipitation with daily maximum

      Foster City monthly snow depth with daily maximum

      Foster City monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Daly City, CA105,5434314%
      Castro Valley, CA62,8254314%
      Norris Canyon, CA1,0464314%
      San Francisco, CA850,2824314%
      San Ramon, CA74,3664314%
      Foster City, CA32,967484%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Socorro, TX32,988512%
      Newark, DE32,9413824%
      Lexington, MA32,936476%
      Ken Caryl, CO32,883548%
      Copperas Cove, TX33,0523628%
      Foster City, CA32,967484%
      Source: The Foster City, 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.