TODAY MAY12
TEMPERATURE57
HUMIDITY83
PRESSURE29.91
WIND COND.170 5.4
  • 8347Wed
  • 8148Thu
  • 7948Fri
  • 7949Sat
  • 7849Sun
daynightWeather update from Napa, Napa County Airport at

Key findings

  • The highest monthly average temperature in Napa for July is 64.6 degrees
  • The lowest monthly average temperature in Napa for December is 46.6 degrees
  • The most monthly precipitation in Napa occurs in January with 3.8 inches
  • The air quality index in Napa is 30% better than the national average
  • The pollution index in Napa is 41% worse than the national average

Compare Napa, CA Weather

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      Napa 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"

      Napa 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.
      IndexNapaCaliforniaNational
      Air quality index355550
      Pollution index7,123,51018,106,7265,066,862

      Napa air quality information

      MeasurementTotal
      Days measured363
      Days with good air quality330
      Days with moderate air quality31
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Napa air quality information

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

      Average monthly Napa temperature with heat index

      Napa monthly precipitation with daily maximum

      Napa monthly snow depth with daily maximum

      Napa monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Glen Ellen, CA7263432%
      St. Helena, CA5,9953432%
      Kenwood, CA1,2273432%
      Fetters Hot Springs-Agua Caliente, CA4,7753530%
      Rutherford, CA1353530%
      Napa, CA79,5673530%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Somerville, MA79,5074314%
      Tustin, CA79,3968978%
      Lawrence, MA79,3373726%
      New Rochelle, NY79,299512%
      Parma, OH80,08850= 100
      Napa, CA79,5673530%
      Source: The Napa, 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.