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Key findings

  • The highest monthly average temperature in Petaluma for July is 64.6 degrees
  • The lowest monthly average temperature in Petaluma for December is 46.6 degrees
  • The most monthly precipitation in Petaluma occurs in January with 3.8 inches
  • The air quality index in Petaluma is 32% better than the national average
  • The pollution index in Petaluma is 56% worse than the national average

Compare Petaluma, CA Weather

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      Petaluma 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"

      Petaluma 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.
      IndexPetalumaCaliforniaNational
      Air quality index345550
      Pollution index7,898,29018,106,7265,066,862

      Petaluma air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality346
      Days with moderate air quality18
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality1

      Petaluma air quality information

      PollutantTotal
      Arsenic0.260%
      Benzene0.080%
      Carbon Tetrachloride0.005%
      Lead0.240%
      Mercury0.270%

      Average monthly Petaluma temperature with heat index

      Petaluma monthly precipitation with daily maximum

      Petaluma monthly snow depth with daily maximum

      Petaluma monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Kenwood, CA1,2273432%
      Roseland, CA5,8593432%
      Point Reyes Station, CA5743432%
      Penngrove, CA2,9403432%
      Santa Rosa, CA173,1653432%
      Petaluma, CA59,7573432%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Springfield, OH59,7614510%
      Lakeville, MN59,786468%
      Marietta, GA59,714524%
      Gardena, CA59,8987244%
      St. Clair Shores, MI59,9165612%
      Petaluma, CA59,7573432%
      Source: The Petaluma, 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.