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City of Diamond Bar, CADiamond Bar, CA Weather Forecast
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Diamond Bar Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  |  |  | | | | | | | |
| Fog | Sunny | Partly Cloudy | Partly Cloudy | Mostly Clear | Sunny | Mostly Clear | Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 60°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 83°FHi: 28°C | Lo: 63°FLo: 17°C | Hi: 83°FHi: 28°C | Lo: 63°FLo: 17°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 83°FHi: 28°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 202 PM PDT Wed Sep 16 2026 
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Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 651 PM PDT Wed Sep 16 2026
Aviation
...17/0029Z.
At 2337Z at KLAX, the marine layer was 3300 feet deep. The top of the inversion was at 6500 feet with a temperature of 17 C.
High confidence in TAFs for KPMD and KWJF.
Moderate to high confidence in remaining TAFs. Timing of flight cat changes could be off by +/- 3 hours, especially for VFR transitions south of Point Conception. Low VFR cigs may not scatter out through the period.
KLAX...Moderate to high confidence in TAF. Timing of flight cats changes may be off by +/- 3 hours....