TODAY OCT14
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 7957
  • 8660Tue
  • 8759Wed
  • 7956Thu
  • 7855Fri
daynightWeather update from San Bernardino-CSU at
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Cajon 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 Cajon for August is 78 degrees.
  • The lowest monthly average temperature in Cajon for December is 55 degrees.
  • The most monthly precipitation in Cajon occurs in December with 1.9 inches.
  • The air quality index in Cajon is 71% worse than the national average.
  • The pollution index in Cajon is 523% worse than the national average.

Compare San Bernardino, CA Weather To Other Cities

Cajon 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.
IndexCajonSan BernardinoCalifornia
Air quality index858555
Pollution index31,575,30031,575,30018,106,726

Cajon 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

Cajon air quality information

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

Average monthly Cajon temperature with heat index

Cajon monthly precipitation with daily maximum

Cajon monthly snow depth with daily maximum

Cajon 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%
Muscoy, CA13,0258570%
Yucaipa, CA52,8868570%
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 Cajon, 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.
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