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Key findings

  • The highest monthly average temperature in Fallbrook for August is 69.5 degrees
  • The lowest monthly average temperature in Fallbrook for December is 52.3 degrees
  • The most monthly precipitation in Fallbrook occurs in January with 4.6 inches
  • The air quality index in Fallbrook is 29% worse than the national average
  • The pollution index in Fallbrook is 350% worse than the national average

Compare Fallbrook, CA Weather

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      Fallbrook 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
      January39°F69°F53°F4.6"
      February40°F68°F54°F3.4"
      March44°F70°F56°F1.6"
      April46°F72°F59°F1.3"
      May53°F73°F62°F0.8"
      June57°F76°F66°F0.1"
      July60°F80°F69°F0.2"
      August60°F81°F69°F0.1"
      September57°F82°F69°F0.3"
      October50°F79°F64°F1.2"
      November43°F75°F57°F1.6"
      December38°F68°F52°F3.8"

      Fallbrook 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.
      IndexFallbrookCaliforniaNational
      Air quality index645550
      Pollution index22,790,90018,106,7265,066,862

      Fallbrook 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

      Fallbrook air quality information

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

      Average monthly Fallbrook temperature with heat index

      Fallbrook monthly precipitation with daily maximum

      Fallbrook monthly snow depth with daily maximum

      Fallbrook monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Carlsbad, CA112,0086428%
      Hidden Meadows, CA3,6486428%
      Pala, CA1,0066428%
      Oceanside, CA173,8296428%
      Bonsall, CA4,2946428%
      Fallbrook, CA31,7716428%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Uniondale, NY31,755512%
      Springville, UT31,796468%
      Fair Oaks, CA31,804524%
      Florence, KY31,735548%
      Bel Air North, MD31,734468%
      Fallbrook, CA31,7716428%
      Source: The Fallbrook, 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.