TODAY JUN18
TEMPERATURE69
HUMIDITY59
PRESSURE29.91
WIND COND.200 19.7
  • 7157Mon
  • 7757Tue
  • 7457Wed
  • 7756Thu
  • 8259Fri
daynightWeather update from Napa, Napa County Airport at

Vallejo Average Weather

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
January18°F80°F46°F3.3"
February25°F77°F49°F3.6"
March27°F82°F51°F1.9"
April25°F91°F54°F1.0"
May34°F101°F59°F0.8"
June36°F103°F63°F0.2"
July43°F106°F65°F0.0"
August43°F100°F64°F0.0"
September37°F99°F63°F0.0"
October34°F92°F58°F1.3"
November22°F84°F52°F1.4"
December19°F66°F46°F3.5"

Did you know?

  • The highest monthly average temperature in Vallejo for July is 65 degrees.
  • The lowest monthly average temperature in Vallejo for December is 46 degrees.
  • The most monthly precipitation in Vallejo occurs in February with 3.6 inches.
  • The air quality index in Vallejo is 13% better than the national average.
  • The pollution index in Vallejo is 40% worse than the national average.

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Compare Vallejo, CA Weather To Other Cities

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 index435550
Pollution index7,123,51018,106,7265,066,862

Vallejo air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality115
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

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.
Alto, CA6494314%
Boyes Hot Springs, CA7,1474314%
Corte Madera, CA9,6944314%
El Cerrito CDP, CA5,6994314%
Green Valley, CA1,2244314%
Vallejo, CA119,6444314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Allentown, PA119,624476%
Evansville, IN120,156484%
Norman, OK118,974476%
Berkeley, CA118,5854314%
Athens, GA120,8133922%
Vallejo, CA119,6444314%
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.