TODAY MAR03
TEMPERATURE47
HUMIDITY88
PRESSURE
WIND COND.136
  • 5947Wed60%40%
  • 6448Thu
  • 7149Fri
  • 6447Sat
  • 6348Sun
daynightWeather update from CW1521 Huntington Beach at

Key findings

  • 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 79% worse than the national average
  • The pollution index in Costa Mesa is 772% worse than the national average

Compare Costa Mesa, CA Weather

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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"

      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 index895550
      Pollution index44,192,60018,106,7265,066,862

      Costa Mesa air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality42
      Days with moderate air quality178
      Days w/ poor A.Q. for sensitive groups79
      Days with unhealthy air quality58

      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.
      Cerritos, CA49,7977244%
      La Palma, CA15,8347244%
      Stanton, CA38,5947244%
      Garden Grove, CA174,6767244%
      Artesia, CA16,7897244%
      Costa Mesa, CA112,4398978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Miami Gardens, FL112,5144118%
      Lehigh Acres, FL112,2793628%
      Round Rock, TX112,7674412%
      Carlsbad, CA112,0086428%
      Elgin, IL111,9195510%
      Costa Mesa, CA112,4398978%
      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.