Diamond Bar, California Weather
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Weather Forecast for Diamond Bar, California : Los Angeles County
Issued: 2:23 am PDT Sep 16, 2025 Latitude: 34.0286226 Longitude: -117.8103367 View on Google Maps

MouseOver for Detail Forecast
Overnight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
Cloudy on Overnight Morning Fog on Tuesday Partly Sunny on Wednesday 60% chance of thunderstorms on Thursday 20% chance of thunderstorms on Friday Sunny on Saturday Sunny on Sunday Sunny on Monday
Low: 66°F High: 95°F High: 92°F High: 85°F High: 81°F High: 85°F High: 86°F High: 90°F
Low: 67°F Low: 66°F Low: 64°F Low: 65°F Low: 64°F Low: 67°F  
Cloudy Morning Fog Partly Sunny Thunderstorms Thunderstorms Sunny Sunny Sunny
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Current Conditions at
CHINO - (KCNO)
66°
Clear
as of 1:53 AM PDST
Rel. Humidity: 88%
Dew Point: 63°F
Visibility: 7 Miles
Pressure: 29.93 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ONTARIO - (KONT)
72°
Clear
as of 1:53 AM PDST
Rel. Humidity: 73%
Dew Point: 63°F
Visibility: 9 Miles
Pressure: 29.93 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
FULLERTON - (KFUL)
66°
Clear
Mist
as of 1:53 AM PDST
Rel. Humidity: 93%
Dew Point: 64°F
Visibility: 4 Miles
Pressure: 29.90 in.
Flight Rule: MVFR
Wind Data
3 MPH
300° Northwest
Cloud Level(s): Clear
Current Conditions at
LONG BEACH - (KLGB)
66°
Cloudy
Mist
as of 2:02 AM PDST
Rel. Humidity: 93%
Dew Point: 64°F
Visibility: 3 Miles
Pressure: 29.91 in.
Flight Rule: IFR
Wind Data
3 MPH
270° West
Cloud Level(s): Solid Overcast at 500ft
Cloudy on Overnight Overnight... Clear early, then becoming cloudy, with a low around 66. Calm wind.
Morning Fog on Tuesday Tuesday... Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 95. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 67. West southwest wind 5 to 10 mph becoming light south southwest after midnight.
Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 92. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon. Winds could gust as high as 15 mph.
30% chance of thunderstorms Wednesday Night Wednesday Night... A 30 percent chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 66. West southwest wind 5 to 10 mph becoming east southeast after midnight. Winds could gust as high as 15 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
60% chance of thunderstorms Thursday Thursday... Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.
40% chance of thunderstorms Thursday Night Thursday Night... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
20% chance of thunderstorms Friday Friday... A chance of showers and thunderstorms, mainly before 11am. Mostly sunny, with a high near 81.
Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 65.
Sunny on Saturday Saturday... Sunny, with a high near 85.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 64.
Sunny on Sunday Sunday... Sunny, with a high near 86.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 67.
Sunny on Monday Monday... Sunny, with a high near 90.
Current Radar Image


Sun Almanac for Diamond Bar, California
Sunrise: 06:36 AM
Sunset: 6:56 PM
Civil Sunrise:06:11 AM
Civil Sunset: 7:21 PM
Nautical Sunrise: 05:41 AM
Nautical Sunset: 7:51 PM
Astro Sunrise: 05:11 AM
Astro Sunset: 8:20 PM
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