TODAY DEC23
TEMPERATURE57
HUMIDITY82
PRESSURE
WIND COND.355 1.6
  • 7149Mon
  • 6146Tue60%40%
  • 6445
  • 6646Thu
  • 6649Fri
daynightWeather update from LOS ANGELES DOWNTOWN at
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Weather Quick Facts

  • The highest monthly average temperature in South Arroyo for August is 75.3 degrees
  • The lowest monthly average temperature in South Arroyo for December is 54.9 degrees
  • The most monthly precipitation in South Arroyo occurs in January with 3.3 inches
  • The air quality index in South Arroyo is 71% worse than the national average
  • The pollution index in South Arroyo is 5017% worse than the national average

Compare Pasadena, CA Weather

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      South Arroyo 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
      January45°F69°F56°F3.3"
      February46°F70°F57°F2.5"
      March49°F73°F60°F2.0"
      April52°F75°F62°F0.6"
      May56°F78°F65°F0.2"
      June60°F83°F70°F0.0"
      July65°F89°F75°F0.0"
      August65°F90°F75°F0.0"
      September63°F89°F74°F0.2"
      October57°F82°F68°F0.5"
      November50°F76°F62°F0.6"
      December44°F68°F55°F2.1"

      South Arroyo 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.
      IndexSouth ArroyoPasadenaCalifornia
      Air quality index727255
      Pollution index139,490,000139,490,00010,473,190

      South Arroyo air quality

      MeasurementTotal
      Days measured365
      Days with good air quality66
      Days with moderate air quality208
      Days w/ poor A.Q. for sensitive groups62
      Days with unhealthy air quality28

      Air quality details

      PollutantTotal
      Arsenic0.200%
      Benzene0.950%
      Carbon Tetrachloride0.080%
      Lead1.320%
      Mercury0.440%

      Average monthly South Arroyo temperature with heat index

      South Arroyo monthly precipitation with daily maximum

      South Arroyo monthly snow depth with daily maximum

      South Arroyo monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      East San Gabriel, CA23,0767244.0%
      Rose Hills, CA2,6197244.0%
      Sierra Madre, CA10,8297244.0%
      Temple City, CA35,6997244.0%
      Lynwood, CA69,6257244.0%
      Pasadena, CA142,0177244.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Milton, ON142,128n/a 
      Murfreesboro, TN141,7044510.0%
      Mesquite, TX142,429512.0%
      Syracuse, NY142,5533726.0%
      McAllen, TX142,5574216.0%
      Pasadena, CA142,0177244.0%
      Source: The South Arroyo, Pasadena, 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.