TODAY FEB28
TEMPERATURE48
HUMIDITY88
PRESSURE
WIND COND.252
  • 7141Sun
  • 7441Mon
  • 7042Tue30%
  • 6542Wed
  • 7046Thu
daynightWeather update from EW4858 El Cajon at

Key findings

  • The highest monthly average temperature in Rancho San Diego for August is 72 degrees
  • The lowest monthly average temperature in Rancho San Diego for December is 56 degrees
  • The most monthly precipitation in Rancho San Diego occurs in December with 2.5 inches
  • The air quality index in Rancho San Diego is 29% worse than the national average
  • The pollution index in Rancho San Diego is 97% better than the national average

Compare Rancho San Diego, CA Weather

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      Rancho San Diego 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°F1.9"
      February47°F69°F57°F2.2"
      March50°F70°F59°F1.0"
      April53°F72°F61°F0.7"
      May57°F72°F63°F0.4"
      June61°F76°F66°F0.0"
      July65°F80°F71°F0.2"
      August66°F82°F72°F0.0"
      September64°F83°F72°F0.2"
      October58°F80°F68°F0.5"
      November51°F74°F62°F0.9"
      December46°F68°F56°F2.5"

      Rancho San Diego 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.
      IndexRancho San DiegoCaliforniaNational
      Air quality index645550
      Pollution index162,74018,106,7265,066,862

      Rancho San Diego air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality87
      Days with moderate air quality253
      Days w/ poor A.Q. for sensitive groups23
      Days with unhealthy air quality2

      Rancho San Diego air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.003%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Rancho San Diego temperature with heat index

      Rancho San Diego monthly precipitation with daily maximum

      Rancho San Diego monthly snow depth with daily maximum

      Rancho San Diego monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Chula Vista, CA260,5986428%
      Lemon Grove, CA26,4216428%
      Spring Valley, CA30,1286428%
      Crest, CA2,7336428%
      Harbison Canyon, CA4,1286428%
      Rancho San Diego, CA22,0186428%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Union Hill-Novelty Hill, WA22,0154510%
      Watertown, SD22,0262550%
      Willowbrook, CA22,0357244%
      South Holland, IL22,0405510%
      Hunters Creek, FL21,9883922%
      Rancho San Diego, CA22,0186428%
      Source: The Rancho San Diego, 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.