TODAY NOV23
TEMPERATURE50
HUMIDITY86
PRESSURE101660
WIND COND.100 5.4
  • 6453Sat30%50%
  • 6551Sun20%
  • 6654Mon20%30%
  • 6555Tue
  • 6651Wed
daynightWeather update from Fullerton, Fullerton Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Southwest for August is 75 degrees
  • The lowest monthly average temperature in Southwest for December is 56.3 degrees
  • The most monthly precipitation in Southwest occurs in December with 2.5 inches
  • The air quality index in Southwest is 71% worse than the national average
  • The pollution index in Southwest is 69% better than the national average

Compare Anaheim, CA Weather

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      Southwest 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
      January46°F72°F57°F2.3"
      February48°F72°F58°F1.7"
      March51°F75°F61°F1.0"
      April54°F76°F64°F0.5"
      May58°F78°F66°F0.3"
      June62°F81°F70°F0.0"
      July66°F86°F74°F0.1"
      August66°F88°F75°F0.0"
      September65°F88°F74°F0.2"
      October59°F83°F69°F0.4"
      November52°F77°F63°F0.6"
      December45°F70°F56°F2.5"

      Southwest 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.
      IndexSouthwestAnaheimCalifornia
      Air quality index728955
      Pollution index858,652858,65210,473,190

      Southwest 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 Southwest temperature with heat index

      Southwest monthly precipitation with daily maximum

      Southwest monthly snow depth with daily maximum

      Southwest monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      South San Jose Hills, CA19,1047244.0%
      Bell Gardens, CA41,7707244.0%
      Downey, CA111,2637244.0%
      La Habra Heights, CA5,3187244.0%
      Los Alamitos, CA11,5217244.0%
      Anaheim, CA353,0858978.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Honolulu, HI347,1813040.0%
      Markham, ON359,111n/a 
      Santa Ana, CA332,6108978.0%
      Riverside, CA327,5698978.0%
      Aurora, CO379,4345816.0%
      Anaheim, CA353,0858978.0%
      Source: The Southwest, Anaheim, 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.