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San Bernardino 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"

Did you know?

  • The highest monthly average temperature in San Bernardino for August is 78 degrees.
  • The lowest monthly average temperature in San Bernardino for December is 55 degrees.
  • The most monthly precipitation in San Bernardino occurs in December with 1.9 inches.
  • The air quality index in San Bernardino is 71% worse than the national average.
  • The pollution index in San Bernardino is 523% worse than the national average.

Compare San Bernardino, CA Weather To Other Cities

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      San Bernardino 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.
      IndexSan BernardinoCaliforniaNational
      Air quality index855550
      Pollution index31,575,30018,106,7265,066,862

      San Bernardino air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality24
      Days with moderate air quality211
      Days w/ poor A.Q. for sensitive groups102
      Days with unhealthy air quality25

      San Bernardino air quality information

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

      Average monthly San Bernardino temperature with heat index

      San Bernardino monthly precipitation with daily maximum

      San Bernardino monthly snow depth with daily maximum

      San Bernardino monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Calimesa, CA8,3798570%
      Grand Terrace, CA12,3938570%
      Lake Arrowhead, CA11,3078570%
      Moreno Valley, CA202,0618570%
      Rialto, CA102,4188570%
      San Bernardino, CA214,5818570%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Des Moines, IA212,8594118%
      Birmingham, AL212,42450= 100
      Richmond, VA216,7733922%
      Spokane, WA212,0783922%
      Boise, ID218,6773628%
      San Bernardino, CA214,5818570%
      Source: The San Bernardino, 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.