Costa Mesa, CA Weather - Forecast & Monthly Averages

TEMPERATURE	53
HUMIDITY	86
PRESSURE	101970
WIND COND.

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Weather Quick Facts

The highest monthly average temperature in Costa Mesa for August is 72.2 degrees
The lowest monthly average temperature in Costa Mesa for December is 57 degrees
The most monthly precipitation in Costa Mesa occurs in December with 2.4 inches
The air quality index in Costa Mesa is 111% worse than the national average
The pollution index in Costa Mesa is 1521% worse than the national average

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Costa Mesa 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	48°F	69°F	57°F	2.3"
February	49°F	69°F	58°F	1.9"
March	52°F	70°F	60°F	0.9"
April	54°F	72°F	62°F	0.6"
May	59°F	73°F	65°F	0.3"
June	62°F	76°F	67°F	0.0"
July	66°F	80°F	71°F	0.1"
August	66°F	82°F	72°F	0.0"
September	65°F	82°F	72°F	0.2"
October	60°F	79°F	68°F	0.5"
November	54°F	75°F	63°F	0.7"
December	48°F	68°F	57°F	2.4"

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Costa Mesa 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	Costa Mesa	California	National
Air quality index	89	55	42
Pollution index	44,192,600	10,473,190	2,726,193

Costa Mesa air quality

Measurement	Total
Days measured	365
Days with good air quality	42
Days with moderate air quality	178
Days w/ poor A.Q. for sensitive groups	79
Days with unhealthy air quality	58

Air quality details

Pollutant	Total
Arsenic	0.030%
Benzene	0.280%
Carbon Tetrachloride	0.001%
Lead	0.220%
Mercury	0.140%

Average monthly Costa Mesa temperature with heat index

Costa Mesa monthly precipitation with daily maximum

Costa Mesa monthly snow depth with daily maximum

Costa Mesa monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Cypress, CA	49,137	72	44.0%
Los Alamitos, CA	11,521	72	44.0%
Westminster, CA	90,857	72	44.0%
Huntington Beach, CA	199,778	72	44.0%
Midway City, CA	8,681	72	44.0%
Costa Mesa, CA	112,958	89	78.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Temecula, CA	113,117	89	78.0%
Delta, BC	112,691	n/a
Clovis, CA	112,663	60	20.0%
Peoria, IL	112,644	41	18.0%
Manchester, NH	112,441	37	26.0%
Costa Mesa, CA	112,958	89	78.0%

Source: The Costa Mesa, 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.