TODAY DEC14
TEMPERATURE61
HUMIDITY24
PRESSURE
WIND COND.66 13
  • 6750Fri
  • 7051Sat
  • 6849Sun
  • 6349Mon
  • 6650Tue
daynightWeather update from WHITTIER HILLS at

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Diamond Bar 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
January40°F70°F54°F1.6"
February41°F71°F55°F1.4"
March44°F75°F58°F0.8"
April47°F78°F61°F0.4"
May52°F82°F65°F0.3"
June57°F89°F71°F0.0"
July62°F94°F76°F0.1"
August61°F96°F77°F0.0"
September59°F94°F74°F0.1"
October52°F86°F67°F0.3"
November44°F78°F60°F0.4"
December39°F69°F53°F2.0"

Did you know?

  • The highest monthly average temperature in Diamond Bar for August is 77 degrees.
  • The lowest monthly average temperature in Diamond Bar for December is 53 degrees.
  • The most monthly precipitation in Diamond Bar occurs in December with 2 inches.
  • The air quality index in Diamond Bar is 70% worse than the national average.
  • The pollution index in Diamond Bar is 83% better than the national average.

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Compare Diamond Bar, CA Weather To Other Cities

Diamond Bar 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.
IndexDiamond BarCaliforniaNational
Air quality index855550
Pollution index858,65218,106,7265,066,862

Diamond Bar 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

Diamond Bar air quality information

PollutantTotal
Arsenic0.002%
Benzene0.010%
Carbon Tetrachloride0.000%
Lead0.020%
Mercury0.001%

Average monthly Diamond Bar temperature with heat index

Diamond Bar monthly precipitation with daily maximum

Diamond Bar monthly snow depth with daily maximum

Diamond Bar monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Artesia, CA16,7897448%
Bradbury, CA9547448%
Cypress, CA48,9787448%
Irwindale, CA1,3197448%
La Palma, CA15,8347448%
Diamond Bar, CA56,4568570%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
New Brunswick, NJ56,4274020%
Berwyn, IL56,4146020%
Taunton, MA56,5044510%
Dearborn Heights, MI56,329524%
Lehi, UT56,314476%
Diamond Bar, CA56,4568570%
Source: The Diamond Bar, 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.