TODAY NOV21
TEMPERATURE67
HUMIDITY47
PRESSURE101930
WIND COND.170 22.3
  • 6550Fri90%100%
  • 6243Sat70%30%
  • 6146Sun50%
  • 6246Mon
  • 6243Tue
daynightWeather update from San Jose, San Jose International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Downtown for July is 68.1 degrees
  • The lowest monthly average temperature in Downtown for January is 50.1 degrees
  • The most monthly precipitation in Downtown occurs in February with 2.5 inches
  • The air quality index in Downtown is 2% worse than the national average
  • The pollution index in Downtown is 762% worse than the national average

Compare San Jose, 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
      January41°F61°F50°F2.5"
      February44°F64°F53°F2.5"
      March46°F68°F56°F2.1"
      April48°F71°F58°F1.3"
      May52°F75°F62°F0.3"
      June56°F80°F66°F0.2"
      July58°F82°F68°F0.0"
      August58°F82°F68°F0.0"
      September57°F82°F67°F0.1"
      October53°F77°F63°F0.6"
      November46°F68°F56°F1.3"
      December41°F61°F50°F2.4"

      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 JoseCalifornia
      Air quality index434355
      Pollution index23,499,80023,499,80010,473,190

      Downtown air quality

      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

      Air quality details

      PollutantTotal
      Arsenic0.120%
      Benzene0.170%
      Carbon Tetrachloride0.001%
      Lead0.220%
      Mercury0.140%

      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.
      Lexington Hills, CA2,6563530.0%
      Boulder Creek, CA5,3053530.0%
      Alum Rock, CA11,7984314.0%
      Los Altos Hills, CA8,4964314.0%
      Mountain View, CA80,1044314.0%
      San Jose, CA1,029,4094314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Edmonton, AB1,053,392n/a 
      Ottawa, ON1,058,126n/a 
      Austin, TX965,8724412.0%
      Jacksonville, FL902,4884314.0%
      Fort Worth, TX892,221512.0%
      San Jose, CA1,029,4094314.0%
      Source: The Downtown, San Jose, 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.