TODAY MAR28
TEMPERATURE60
HUMIDITY44
PRESSURE101860
WIND COND.280 24.1
  • 5748Fri100%100%
  • 6246Sat80%20%
  • 6147Sun
  • 6848Mon
  • 7050Tue
daynightWeather update from San Francisco, San Francisco International Airport at
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Weather Quick Facts

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

Compare San Mateo, CA Weather

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      Downtown 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"

      Downtown 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.
      IndexDowntownSan MateoCalifornia
      Air quality index434355
      Pollution index9,645,6109,645,61010,473,190

      Downtown 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

      Downtown air quality information

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

      Average monthly Downtown temperature with heat index

      Downtown monthly precipitation with daily maximum

      Downtown monthly snow depth with daily maximum

      Downtown monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Alameda, CA79,8274020.0%
      San Francisco, CA874,7844020.0%
      Ashland, CA23,5664020.0%
      San Leandro, CA90,4894020.0%
      Colma, CA1,4924020.0%
      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 Downtown, 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.