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Key findings

  • The highest monthly average temperature in Rialto for August is 77.6 degrees
  • The lowest monthly average temperature in Rialto for January is 54.3 degrees
  • The most monthly precipitation in Rialto occurs in January with 11.6 inches
  • The air quality index in Rialto is 79% worse than the national average
  • The pollution index in Rialto is 523% worse than the national average

Compare Rialto, CA Weather

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      Rialto 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
      January43°F66°F54°F11.6"
      February47°F67°F56°F9.6"
      March48°F74°F60°F2.1"
      April50°F76°F61°F4.1"
      May55°F81°F66°F4.8"
      June58°F86°F70°F0.1"
      July65°F94°F78°F0.2"
      August65°F95°F78°F2.3"
      September60°F88°F72°F2.1"
      October57°F82°F67°F4.3"
      November50°F77°F62°F7.7"
      December43°F67°F55°F3.3"

      Rialto 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.
      IndexRialtoCaliforniaNational
      Air quality index895550
      Pollution index31,575,30018,106,7265,066,862

      Rialto 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

      Rialto air quality information

      PollutantTotal
      Arsenic0.110%
      Benzene0.260%
      Carbon Tetrachloride0.020%
      Lead0.350%
      Mercury0.280%

      Average monthly Rialto temperature with heat index

      Rialto monthly precipitation with daily maximum

      Rialto monthly snow depth with daily maximum

      Rialto monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Grand Terrace, CA12,3938978%
      Moreno Valley, CA202,0618978%
      Norco, CA26,8098978%
      Fontana, CA205,2288978%
      San Bernardino, CA214,5818978%
      Rialto, CA102,4188978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Lewisville, TX102,327512%
      Davenport, IA102,305468%
      San Mateo, CA102,2244314%
      Sandy Springs, GA102,212524%
      Clovis, CA102,1486020%
      Rialto, CA102,4188978%
      Source: The Rialto, 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.