TODAY AUG18
TEMPERATURE82
HUMIDITY43
PRESSURE30
WIND COND.190 13.9
  • 8554Sat
  • 8354Sun
  • 8053Mon
  • 7654Tue
  • 8054Wed
daynightWeather update from Napa, Napa County Airport at

Napa 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
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"

Did you know?

  • The highest monthly average temperature in Napa for July is 65 degrees.
  • The lowest monthly average temperature in Napa for December is 47 degrees.
  • The most monthly precipitation in Napa occurs in January with 3.8 inches.
  • The air quality index in Napa is 13% better than the national average.
  • The pollution index in Napa is 40% worse than the national average.

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Compare Napa, CA Weather To Other Cities

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

Napa air quality information

MeasurementTotal
Days measured365
Days with good air quality220
Days with moderate air quality143
Days w/ poor A.Q. for sensitive groups2
Days with unhealthy air quality

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.
Kenwood, CA1,2273530%
Glen Ellen, CA7263530%
St. Helena, CA5,9953530%
Black Point-Green Point, CA1,5924314%
Fairfield, CA110,9534314%
Napa, CA79,5674314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Somerville, MA79,507476%
Tustin, CA79,3968570%
Lawrence, MA79,3373628%
New Rochelle, NY79,299536%
Parma, OH80,0885510%
Napa, CA79,5674314%
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.