TODAY NOV10
TEMPERATURE49
HUMIDITY54
PRESSURE101520
WIND COND.
  • 5853Sun40%
  • 5545100%20%
  • 5546Tue
  • 5553Wed
  • 5448Thu
daynightWeather update from Napa, Napa County Airport at
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Weather Quick Facts

  • 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 5% better than the national average
  • The pollution index in Vallejo is 161% 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 index405542
      Pollution index7,123,51010,473,1902,726,193

      Vallejo air quality

      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

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Sonoma, CA11,0823530.0%
      Green Valley CDP (Los Angeles County), CA1,0003530.0%
      Temelec, CA1,9153530.0%
      Green Valley, CA1,5833530.0%
      Boyes Hot Springs, CA8,0063530.0%
      Vallejo, CA121,2754020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Allentown, PA121,1564216.0%
      Ann Arbor, MI121,0934020.0%
      East Los Angeles, CA120,5047244.0%
      Wilmington, NC122,1623432.0%
      Arvada, CO120,2295816.0%
      Vallejo, CA121,2754020.0%
      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.