Diamond Bar, California Weather
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Weather Forecast for Diamond Bar, California : Los Angeles County
Issued: 3:23 am PDT May 4, 2025 Latitude: 34.0286226 Longitude: -117.8103367 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
40% chance of rain on Overnight 40% chance of rain on Sunday Mostly Cloudy on Monday Morning Fog on Tuesday Morning Fog on Wednesday Sunny on Thursday Mostly Sunny on Friday Patchy Fog on Saturday
Low: 53°F High: 63°F High: 64°F High: 70°F High: 76°F High: 83°F High: 86°F High: 86°F
Low: 53°F Low: 52°F Low: 54°F Low: 56°F Low: 59°F Low: 61°F  
Rain Rain Mostly Cloudy Morning Fog Morning Fog Sunny Mostly Sunny Patchy Fog
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Current Conditions at
CHINO - (KCNO)
57°
Cloudy
as of 2:53 AM PDST
Rel. Humidity: 87%
Dew Point: 54°F
Visibility: 10 Miles
Pressure: 29.79 in.
Flight Rule: IFR
Wind Data
8 MPH
240° Southwest
Cloud Level(s): Broken at 900ft, Solid Overcast at 1700ft
Current Conditions at
ONTARIO - (KONT)
55°
Cloudy
Light Rain Mist
as of 3:24 AM PDST
Rel. Humidity: 93%
Dew Point: 54°F
Visibility: 4 Miles
Pressure: 29.77 in.
Flight Rule: MVFR
Wind Data
7 MPH
250° West
Cloud Level(s): Scattered at 700ft, Solid Overcast at 1300ft
Current Conditions at
FULLERTON - (KFUL)
57°
Cloudy
as of 2:53 AM PDST
Rel. Humidity: 38%
Dew Point: 32°F
Visibility: 10 Miles
Pressure: 29.78 in.
Flight Rule: MVFR
Wind Data
6 MPH
250° West
Cloud Level(s): Solid Overcast at 1800ft
Current Conditions at
LONG BEACH - (KLGB)
57°
Cloudy
as of 2:53 AM PDST
Rel. Humidity: 76%
Dew Point: 50°F
Visibility: 10 Miles
Pressure: 29.77 in.
Flight Rule: MVFR
Wind Data
8 MPH
280° West
Cloud Level(s): Solid Overcast at 2200ft
40% chance of rain Overnight Overnight... A 40 percent chance of showers. Cloudy, with a low around 53. South wind around 10 mph. New precipitation amounts of less than a tenth of an inch possible.
40% chance of rain Sunday Sunday... A 40 percent chance of showers. Cloudy, with a high near 63. South wind around 10 mph, with gusts as high as 15 mph. New precipitation amounts of less than a tenth of an inch possible.
30% chance of rain Sunday Night Sunday Night... A 30 percent chance of showers. Cloudy, with a low around 53. South wind 5 to 10 mph. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy on Monday Monday... Mostly cloudy, with a high near 64. Light south wind becoming south southwest 5 to 10 mph in the afternoon.
Patchy Fog on Monday Night Monday Night... Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 52. Southwest wind 5 to 10 mph.
Morning Fog on Tuesday Tuesday... Patchy fog before 11am. Otherwise, partly sunny, with a high near 70.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 54.
Morning Fog on Wednesday Wednesday... Patchy fog before 11am. Otherwise, mostly sunny, with a high near 76.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 56.
Sunny on Thursday Thursday... Sunny, with a high near 83.
Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 59.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 86.
Patchy Fog on Friday Night Friday Night... Patchy fog. Otherwise, mostly cloudy, with a low around 61.
Patchy Fog on Saturday Saturday... Patchy fog. Otherwise, mostly sunny, with a high near 86.
Current Radar Image


Sun Almanac for Diamond Bar, California
Sunrise: 05:58 AM
Sunset: 7:38 PM
Civil Sunrise:05:31 AM
Civil Sunset: 8:05 PM
Nautical Sunrise: 04:59 AM
Nautical Sunset: 8:37 PM
Astro Sunrise: 04:25 AM
Astro Sunset: 9:11 PM
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