TODAY AUG20
TEMPERATURE59
HUMIDITY83
PRESSURE
WIND COND.241 9.6
  • 8055Mon
  • 7756Tue
  • 7956Wed
  • 8056Thu
  • 7955Fri
daynightWeather update from Vallejo at

Port Costa 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
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"

Did you know?

  • 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 13% better than the national average.
  • The pollution index in Port Costa is 278% worse than the national average.

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Compare Port Costa, CA Weather To Other Cities

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 index435550
Pollution index19,202,40018,106,7265,066,862

Port Costa air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality115
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

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.
Alhambra Valley, CA5014314%
Berkeley, CA118,5854314%
Concord, CA126,9384314%
East Richmond Heights, CA3,3644314%
Fairfield, CA110,9534314%
Port Costa, CA2284314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Ensign, KS228688%
Bolivia, NC2283922%
Gordon, WI2283726%
Taylor Landing, TX2284412%
Argyle, MO2283726%
Port Costa, CA2284314%
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.