TODAY MAR08
TEMPERATURE53
HUMIDITY69
PRESSURE30.06
WIND COND.270 24.1
  • 5844Mon30%
  • 5744Tue80%80%
  • 5742Wed60%20%
  • 6142Thu
  • 6443Fri
daynightWeather update from San Francisco, San Francisco International Airport at

Key findings

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

Compare Belmont, CA Weather

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      Belmont 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"

      Belmont 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.
      IndexBelmontCaliforniaNational
      Air quality index435550
      Pollution index9,645,61018,106,7265,066,862

      Belmont 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

      Belmont air quality information

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

      Average monthly Belmont temperature with heat index

      Belmont monthly precipitation with daily maximum

      Belmont monthly snow depth with daily maximum

      Belmont monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Castro Valley, CA62,8254020%
      Colma, CA1,5404020%
      South San Francisco, CA66,5874020%
      San Leandro, CA89,0394020%
      Brisbane, CA4,5684020%
      Belmont, CA26,9184314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Garden City, KS26,9161570%
      South Laurel, MD26,952476%
      Leisure City, FL26,8614118%
      Bessemer, AL26,856536%
      Watertown, NY26,9973530%
      Belmont, CA26,9184314%
      Source: The Belmont, 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.