TODAY MAY05
TEMPERATURE65
HUMIDITY56
PRESSURE29.9
WIND COND.
  • 5851Thu
  • 5951Fri
  • 6454Sat
  • 6454Sun
  • 6653Mon
daynightWeather update from San Francisco, San Francisco International Airport at

Key findings

  • The highest monthly average temperature in Foster City for September is 63.3 degrees
  • The lowest monthly average temperature in Foster City for January is 50.7 degrees
  • The most monthly precipitation in Foster City occurs in December with 4.4 inches
  • The air quality index in Foster City is 14% better than the national average
  • The pollution index in Foster City is 90% worse than the national average

Compare Foster City, CA Weather

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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"

      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 index435550
      Pollution index9,645,61018,106,7265,066,862

      Foster City air quality information

      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

      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.
      Brisbane, CA4,5684020%
      Daly City, CA105,5434020%
      Ashland, CA24,2884020%
      San Leandro, CA89,0394020%
      San Francisco, CA850,2824020%
      Foster City, CA32,9674314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Socorro, TX32,988536%
      Newark, DE32,9414216%
      Lexington, MA32,9364314%
      Ken Caryl, CO32,8835816%
      Copperas Cove, TX33,0524216%
      Foster City, CA32,9674314%
      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.