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Diamond Bar, CA weather and climate

Los Angeles County, CA · population 53,750 · about 1,001 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Diamond Bar's own coordinates.

The year at a glance

Sunny days
290
clear or partly cloudy, per year
Precipitation
16 in
per year
Wet days
38
rain or snow per year
Snowfall
0 in
per year
Hot days
70
above 90 °F
Freezing nights
3
at or below 32 °F
Humidity
63%
average relative
Average temperature
66 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
406080JanMarMayJulSepNovDaily high, Jan: 69 °FDaily high, Feb: 69 °FDaily high, Mar: 73 °FDaily high, Apr: 76 °FDaily high, May: 79 °FDaily high, Jun: 84 °FDaily high, Jul: 90 °FDaily high, Aug: 92 °FDaily high, Sep: 89 °FDaily high, Oct: 82 °FDaily high, Nov: 75 °FDaily high, Dec: 68 °FDaily low, Jan: 44 °FDaily low, Feb: 45 °FDaily low, Mar: 48 °FDaily low, Apr: 51 °FDaily low, May: 55 °FDaily low, Jun: 58 °FDaily low, Jul: 63 °FDaily low, Aug: 64 °FDaily low, Sep: 61 °FDaily low, Oct: 55 °FDaily low, Nov: 48 °FDaily low, Dec: 43 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high696973767984909289827568
Daily low444548515558636461554843

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovDiamond Bar, Jan: 3.6 inDiamond Bar, Feb: 4.0 inDiamond Bar, Mar: 2.4 inDiamond Bar, Apr: 1.0 inDiamond Bar, May: 0.4 inDiamond Bar, Jun: 0.1 inDiamond Bar, Jul: 0.1 inDiamond Bar, Aug: 0.0 inDiamond Bar, Sep: 0.2 inDiamond Bar, Oct: 0.7 inDiamond Bar, Nov: 1.0 inDiamond Bar, Dec: 2.4 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Diamond Bar3.64.02.41.00.40.10.10.00.20.71.02.4

Monthly sunny days

Days each month with clear or partly cloudy skies.

0102030JanMarMayJulSepNovDiamond Bar, Jan: 19 daysDiamond Bar, Feb: 17 daysDiamond Bar, Mar: 20 daysDiamond Bar, Apr: 23 daysDiamond Bar, May: 25 daysDiamond Bar, Jun: 28 daysDiamond Bar, Jul: 29 daysDiamond Bar, Aug: 30 daysDiamond Bar, Sep: 29 daysDiamond Bar, Oct: 27 daysDiamond Bar, Nov: 24 daysDiamond Bar, Dec: 21 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Diamond Bar191720232528293029272421

Compare Diamond Bar with another city

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See weather for every covered California city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).