TODAY MAY13
TEMPERATURE65
HUMIDITY68
PRESSURE29.96
WIND COND.190 22.3
  • 6351Thu
  • 6451Fri
  • 6552Sat
  • 6253Sun
  • 6151Mon
daynightWeather update from Napa, Napa County Airport at

Key findings

  • The highest monthly average temperature in Vallejo for July is 64.6 degrees
  • The lowest monthly average temperature in Vallejo for December is 46.6 degrees
  • The most monthly precipitation in Vallejo occurs in January with 3.8 inches
  • The air quality index in Vallejo is 20% better than the national average
  • The pollution index in Vallejo is 41% worse than the national average

Compare Vallejo, CA Weather

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      Vallejo 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
      January36°F58°F47°F3.8"
      February39°F62°F50°F3.4"
      March41°F66°F52°F3.0"
      April42°F69°F55°F1.6"
      May46°F74°F59°F0.5"
      June50°F80°F64°F0.3"
      July53°F81°F65°F0.0"
      August53°F80°F64°F0.0"
      September49°F82°F64°F0.1"
      October45°F76°F59°F1.3"
      November40°F66°F52°F1.8"
      December36°F58°F47°F3.8"

      Vallejo 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.
      IndexVallejoCaliforniaNational
      Air quality index405550
      Pollution index7,123,51018,106,7265,066,862

      Vallejo air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality290
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Vallejo air quality information

      PollutantTotal
      Arsenic0.110%
      Benzene0.070%
      Carbon Tetrachloride0.000%
      Lead0.090%
      Mercury0.050%

      Average monthly Vallejo temperature with heat index

      Vallejo monthly precipitation with daily maximum

      Vallejo monthly snow depth with daily maximum

      Vallejo monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Boyes Hot Springs, CA7,1473530%
      Suisun City, CA29,0453530%
      El Verano, CA4,1613530%
      Fairfield, CA110,9533530%
      Napa, CA79,5673530%
      Vallejo, CA119,6444020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Allentown, PA119,6244216%
      Evansville, IN120,1564510%
      Norman, OK118,974484%
      Berkeley, CA118,5854020%
      Athens, GA120,8134412%
      Vallejo, CA119,6444020%
      Source: The Vallejo, 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.