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Key findings

  • The highest monthly average temperature in Grand for August is 78 degrees
  • The lowest monthly average temperature in Grand for December is 55 degrees
  • The most monthly precipitation in Grand occurs in December with 1.9 inches
  • The air quality index in Grand is 79% worse than the national average
  • The pollution index in Grand is 350% worse than the national average

Compare Riverside, CA Weather

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      Grand 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°F70°F56°F1.6"
      February45°F72°F57°F1.2"
      March47°F75°F60°F0.7"
      April50°F78°F63°F0.5"
      May55°F82°F66°F0.2"
      June59°F89°F72°F0.0"
      July65°F94°F77°F0.2"
      August65°F95°F78°F0.1"
      September63°F94°F76°F0.2"
      October56°F85°F69°F0.2"
      November49°F77°F62°F0.5"
      December44°F69°F55°F1.9"

      Grand 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.
      IndexGrandRiversideCalifornia
      Air quality index898955
      Pollution index22,790,90022,790,90018,106,726

      Grand 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

      Grand air quality information

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

      Average monthly Grand temperature with heat index

      Grand monthly precipitation with daily maximum

      Grand monthly snow depth with daily maximum

      Grand monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Bloomington, CA23,3228978%
      Eastvale, CA58,2178978%
      Good Hope, CA9,4718978%
      Home Gardens, CA11,3838978%
      March ARB, CA1,1458978%
      Riverside, CA318,6788978%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Corpus Christi, TX320,0504216%
      St. Louis, MO316,030548%
      Lexington-Fayette, KY311,5294216%
      Pittsburgh, PA305,3055612%
      Santa Ana, CA333,6058978%
      Riverside, CA318,6788978%
      Source: The Grand, Riverside, 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.