Diamond Bar (CA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Diamond Bar

Diamond Bar average temperature chart (Celsius) Diamond Bar average temperature chart (Fahrenheit)
Average monthly temperatures in Diamond Bar (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 18.2 19.5 19.6 22 24.4 27.9 32.2 32.4 30 26.4 21.4 18.1
°F 64.7 67 67.2 71.5 75.9 82.2 89.9 90.3 86 79.5 70.6 64.5

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Diamond Bar monthly rainfall chart (mm) Diamond Bar monthly rainfall chart (inches)
Average monthly rainfall in Diamond Bar (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 90 90 79 31 9 1 1 4 10 9 49 62
inches 3.5 3.6 3.1 1.2 0.4 0.1 0.1 0.2 0.4 0.4 1.9 2.4
Rainy days 5 5 6 3 1 0 0 1 2 2 4 4

Average annual rainfall in Diamond Bar: 352.733mm (138.9 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Diamond Bar

Diamond Bar average daily sunshine chart
Average daily sunshine Diamond Bar
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.7 8.4 9 10.5 10 10.8 12.2 11.7 10.2 9.1 7.9 7.6

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Diamond Bar average minimum / maximum temperatures (Celsius) Diamond Bar average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Diamond Bar (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 4.3 5.4 6.1 7.7 10.7 13.4 16.1 16.5 14.4 11.1 7 4.2
Max °C 18.5 19.8 19.9 22.3 24.7 28.3 32.6 32.8 30.4 26.8 21.8 18.4
Min °F 39.7 41.7 43 45.9 51.3 56 60.9 61.6 57.9 51.9 44.6 39.6
Max °F 52.5 54.7 55.4 59 63.9 69.4 75.7 76.3 72.3 66 57.9 52.3

Sea temperature

The graph below shows the average sea temperature.

Diamond Bar average sea temperature chart (Celsius) Diamond Bar average sea temperature chart (Fahrenheit)
Average sea temperature around Diamond Bar in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 14.6 14.5 14.7 15 15.8 17.2 18.9 19.7 19.6 18.6 17 15.3
°F 58.2 58.1 58.4 58.9 60.5 62.9 66 67.5 67.3 65.6 62.6 59.6

Wind speed

The graph below shows the average wind speed.

Diamond Bar average winspeed by month (km/h) Diamond Bar average winspeed by month (mph)
Average wind speed in Diamond Bar (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 11 12 14 14 14 14 14 13 13 12 11 10
mph 7 8 9 9 9 9 9 8 8 7 7 7

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Diamond Bar relative humidity averages
Average relative humidity in Diamond Bar
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
63% 64% 63% 60% 61% 62% 62% 63% 63% 62% 63% 63%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Diamond Bar weather stats

Diamond Bar weather statistics
Hottest month: August 32.4°C 90.3°F
Driest month: July 1mm 0ins
Sunniest month: August 11.7hrs
Coldest month: December 18.1°C 64.6°F
Wettest month: February 90mm 3.5ins
Warmest sea: August 19.7°C 67.5°F
Map showing location of Diamond Bar (34.02862, -117.81034) Diamond Bar map pin © Google

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