TODAY JAN22
TEMPERATURE68
HUMIDITY39
PRESSURE29.99
WIND COND.250 16.6
  • 5744Fri20%40%
  • 5341Sat50%30%
  • 5940Sun
  • 4935Mon
  • 4939Tue
daynightWeather update from Ontario, Ontario International Airport at

Key findings

  • The highest monthly average temperature in Rancho Cucamonga for August is 78 degrees
  • The lowest monthly average temperature in Rancho Cucamonga for December is 55 degrees
  • The most monthly precipitation in Rancho Cucamonga occurs in December with 2.6 inches
  • The air quality index in Rancho Cucamonga is 79% worse than the national average
  • The pollution index in Rancho Cucamonga is 350% worse than the national average

Compare Rancho Cucamonga, CA Weather

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      Rancho Cucamonga 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
      January44°F69°F56°F2.3"
      February45°F70°F57°F2.0"
      March48°F74°F60°F1.2"
      April51°F77°F62°F0.7"
      May55°F81°F66°F0.4"
      June60°F88°F72°F0.0"
      July65°F94°F77°F0.1"
      August65°F95°F78°F0.0"
      September64°F93°F76°F0.2"
      October57°F84°F69°F0.4"
      November49°F77°F62°F0.6"
      December43°F68°F55°F2.6"

      Rancho Cucamonga 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 CucamongaCaliforniaNational
      Air quality index895550
      Pollution index22,790,90018,106,7265,066,862

      Rancho Cucamonga 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

      Rancho Cucamonga air quality information

      PollutantTotal
      Arsenic0.060%
      Benzene0.190%
      Carbon Tetrachloride0.010%
      Lead0.220%
      Mercury0.230%

      Average monthly Rancho Cucamonga temperature with heat index

      Rancho Cucamonga monthly precipitation with daily maximum

      Rancho Cucamonga monthly snow depth with daily maximum

      Rancho Cucamonga monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Charter Oak, CA9,4018978%
      Claremont, CA35,8278978%
      Montclair, CA38,2948978%
      San Dimas, CA34,1098978%
      Lytle Creek, CA1,0198978%
      Rancho Cucamonga, CA173,3098978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Santa Rosa, CA173,1653432%
      Oceanside, CA173,8296428%
      Jackson, MS172,0394412%
      Garden Grove, CA174,6767244%
      Tempe, AZ174,7087448%
      Rancho Cucamonga, CA173,3098978%
      Source: The Rancho Cucamonga, 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.