TODAY DEC08
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 6439Mon
  • 5841Tue
  • 6042Wed
  • 5944Thu
  • 5946Fri
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Weather Quick Facts

  • The highest monthly average temperature in Port Costa for July is 70.8 degrees
  • The lowest monthly average temperature in Port Costa for December is 47.3 degrees
  • The most monthly precipitation in Port Costa occurs in January with 3.3 inches
  • The air quality index in Port Costa is 5% better than the national average
  • The pollution index in Port Costa is 604% 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 index405542
      Pollution index19,202,40010,473,1902,726,193

      Port Costa air quality

      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

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Suisun City, CA29,4593530.0%
      Fairfield, CA116,5443530.0%
      Alamo, CA13,8644020.0%
      Contra Costa Centre, CA6,6674020.0%
      Orinda, CA19,4614020.0%
      Port Costa, CA2424020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Orchard Hill, GA2423824.0%
      Talmo, GA2423726.0%
      Patterson, IA2423922.0%
      Wardner, ID2424314.0%
      Sawyerville, IL242548.0%
      Port Costa, CA2424020.0%
      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.