TODAY DEC22
TEMPERATURE50
HUMIDITY89
PRESSURE101960
WIND COND.271
  • 6949Mon
  • 6547Tue60%40%
  • 6546
  • 6646Thu
  • 6748Fri
daynightWeather update from FW0058 Santa Ana Fire at
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Weather Quick Facts

  • The highest monthly average temperature in Northwest for August is 72.2 degrees
  • The lowest monthly average temperature in Northwest for December is 57 degrees
  • The most monthly precipitation in Northwest occurs in December with 2.4 inches
  • The air quality index in Northwest is 111% worse than the national average
  • The pollution index in Northwest is 69% better than the national average

Compare Santa Ana, CA Weather

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      Northwest 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"

      Northwest 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.
      IndexNorthwestSanta AnaCalifornia
      Air quality index898955
      Pollution index858,652858,65210,473,190

      Northwest air quality

      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

      Air quality details

      PollutantTotal
      Arsenic0.002%
      Benzene0.010%
      Carbon Tetrachloride0.000%
      Lead0.020%
      Mercury0.001%

      Average monthly Northwest temperature with heat index

      Northwest monthly precipitation with daily maximum

      Northwest monthly snow depth with daily maximum

      Northwest monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Santa Fe Springs, CA17,6437244.0%
      Westminster, CA90,8577244.0%
      Buena Park, CA82,2287244.0%
      Garden Grove, CA172,8007244.0%
      Downey, CA111,2637244.0%
      Santa Ana, CA332,6108978.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Riverside, CA327,5698978.0%
      Corpus Christi, TX326,3324216.0%
      Lexington-Fayette, KY322,2004216.0%
      Vaughan, ON321,974n/a 
      Honolulu, HI347,1813040.0%
      Santa Ana, CA332,6108978.0%
      Source: The Northwest, Santa Ana, 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.