TODAY AUG14
TEMPERATURE67
HUMIDITY63
PRESSURE29.92
WIND COND.310 11.2
  • 8462Fri
  • 7960Sat
  • 7459Sun
  • 7659Mon
  • 7859Tue
daynightWeather update from San Francisco, San Francisco International Airport at

Key findings

  • The highest monthly average temperature in San Bruno for September is 63 degrees
  • The lowest monthly average temperature in San Bruno for January is 51 degrees
  • The most monthly precipitation in San Bruno occurs in December with 4.4 inches
  • The air quality index in San Bruno is 14% better than the national average
  • The pollution index in San Bruno is 90% worse than the national average

Compare San Bruno, CA Weather

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      San Bruno 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"

      San Bruno 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.
      IndexSan BrunoCaliforniaNational
      Air quality index435550
      Pollution index9,645,61018,106,7265,066,862

      San Bruno air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality252
      Days with moderate air quality101
      Days w/ poor A.Q. for sensitive groups10
      Days with unhealthy air quality2

      San Bruno air quality information

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

      Average monthly San Bruno temperature with heat index

      San Bruno monthly precipitation with daily maximum

      San Bruno monthly snow depth with daily maximum

      San Bruno monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Alameda, CA77,4094020%
      Oakland, CA412,0404020%
      South San Francisco, CA66,5874020%
      San Francisco, CA850,2824020%
      Colma, CA1,5404020%
      San Bruno, CA42,7364314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Belleville, IL42,729548%
      Salem, MA42,8044314%
      Moline, IL42,805468%
      Bell Gardens, CA42,8057244%
      Fairfield, OH42,640548%
      San Bruno, CA42,7364314%
      Source: The San Bruno, 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.