TODAY OCT17
TEMPERATURE58
HUMIDITY77
PRESSURE30.02
WIND COND.49
  • 8063Wed
  • 8265Thu
  • 8566Fri
  • 8266Sat
  • 7765Sun
daynightWeather update from CW1521 Huntington Beach at
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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.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January48°F69°F57°F2.3"
February49°F69°F58°F1.9"
March52°F70°F60°F0.9"
April54°F72°F62°F0.6"
May59°F73°F65°F0.3"
June62°F76°F67°F0.0"
July66°F80°F71°F0.1"
August66°F82°F72°F0.0"
September65°F82°F72°F0.2"
October60°F79°F68°F0.5"
November54°F75°F63°F0.7"
December48°F68°F57°F2.4"

Did you know?

  • The highest monthly average temperature in Costa Mesa for August is 72 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 70% worse than the national average.
  • The pollution index in Costa Mesa is 772% worse than the national average.

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Compare Costa Mesa, CA Weather To Other Cities

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.
IndexCosta MesaCaliforniaNational
Air quality index855550
Pollution index44,192,60018,106,7265,066,862

Costa Mesa air quality information

MeasurementTotal
Days measured365
Days with good air quality24
Days with moderate air quality211
Days w/ poor A.Q. for sensitive groups102
Days with unhealthy air quality25

Costa Mesa air quality information

PollutantTotal
Arsenic0.030%
Benzene0.280%
Carbon Tetrachloride0.001%
Lead0.220%
Mercury0.140%

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, StatePopulationAir Quality IndexNational Avg.
Midway City, CA9,2357448%
Cerritos, CA49,7977448%
Garden Grove, CA174,6767448%
Seal Beach, CA24,5107448%
Cypress, CA48,9787448%
Costa Mesa, CA112,4398570%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Miami Gardens, FL112,5144118%
Lehigh Acres, FL112,2793334%
Round Rock, TX112,7674118%
Carlsbad, CA112,0086122%
Elgin, IL111,9196020%
Costa Mesa, CA112,4398570%
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.