Port Costa, CA Weather - Forecast & Monthly Averages

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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

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	39°F	58°F	48°F	3.3"
February	43°F	62°F	52°F	3.0"
March	45°F	67°F	54°F	1.8"
April	47°F	71°F	57°F	1.9"
May	52°F	78°F	63°F	0.6"
June	56°F	85°F	68°F	0.0"
July	58°F	90°F	71°F	0.0"
August	57°F	90°F	70°F	0.0"
September	56°F	86°F	68°F	0.0"
October	50°F	77°F	62°F	1.4"
November	45°F	68°F	55°F	1.2"
December	40°F	57°F	47°F	2.3"

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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.
Index	Port Costa	California	National
Air quality index	40	55	42
Pollution index	19,202,400	10,473,190	2,726,193

Port Costa air quality

Measurement	Total
Days measured	365
Days with good air quality	290
Days with moderate air quality	74
Days w/ poor A.Q. for sensitive groups	1
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.180%
Benzene	0.140%
Carbon Tetrachloride	0.010%
Lead	0.280%
Mercury	0.060%

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	Population	Air Quality Index	National Avg.
Suisun City, CA	29,459	35	30.0%
Fairfield, CA	116,544	35	30.0%
Clyde, CA	737	40	20.0%
Rodeo, CA	10,023	40	20.0%
Berkeley, CA	123,065	40	20.0%
Port Costa, CA	242	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Orchard Hill, GA	242	38	24.0%
Talmo, GA	242	37	26.0%
Patterson, IA	242	39	22.0%
Wardner, ID	242	43	14.0%
Sawyerville, IL	242	54	8.0%
Port Costa, CA	242	40	20.0%

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.