TODAY MAR03
TEMPERATURE68
HUMIDITY26
PRESSURE
WIND COND.360 8.3
  • 6443Wed
  • 6242Thu
  • 6545Fri
  • 6042Sat
  • 6042Sun
daynightWeather update from Vallejo at

Key findings

  • The highest monthly average temperature in Port Costa for July is 71 degrees
  • The lowest monthly average temperature in Port Costa for December is 47 degrees
  • The most monthly precipitation in Port Costa occurs in January with 3.3 inches
  • The air quality index in Port Costa is 20% better than the national average
  • The pollution index in Port Costa is 279% worse than the national average

Compare Port Costa, CA Weather

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      Port Costa 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
      January39°F58°F48°F3.3"
      February43°F62°F52°F3.0"
      March45°F67°F54°F1.8"
      April47°F71°F57°F1.9"
      May52°F78°F63°F0.6"
      June56°F85°F68°F0.0"
      July58°F90°F71°F0.0"
      August57°F90°F70°F0.0"
      September56°F86°F68°F0.0"
      October50°F77°F62°F1.4"
      November45°F68°F55°F1.2"
      December40°F57°F47°F2.3"

      Port Costa 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.
      IndexPort CostaCaliforniaNational
      Air quality index405550
      Pollution index19,202,40018,106,7265,066,862

      Port Costa air quality information

      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

      Port Costa air quality information

      PollutantTotal
      Arsenic0.180%
      Benzene0.140%
      Carbon Tetrachloride0.010%
      Lead0.280%
      Mercury0.060%

      Average monthly Port Costa temperature with heat index

      Port Costa monthly precipitation with daily maximum

      Port Costa monthly snow depth with daily maximum

      Port Costa monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Suisun City, CA29,0453530%
      Fairfield, CA110,9533530%
      Alhambra Valley, CA5014020%
      Lafayette, CA25,3814020%
      Pacheco, CA4,0594020%
      Port Costa, CA2284020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Argyle, MO2283922%
      Kellyton, AL2283824%
      St. Thomas, MO2283922%
      Marble City, OK2283628%
      Gordon, WI2283530%
      Port Costa, CA2284020%
      Source: The Port Costa, 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.