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City of Diamond Bar, CADiamond Bar, CA 7-Day Weather Forecast
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Diamond Bar Weather Forecast
Diamond Bar, CA Weather Forecast Date: 228 AM PDT Sun Sep 20 2026
Weather forecast for Diamond Bar, CA
Today Hi: 80°FHi: 27°C Lo: 63°F Lo: 17°C |
Today... Low clouds and fog mostly clearing in the afternoon. Highs in the upper 70s to mid 80s. |
Mon Hi: 76°FHi: 24°C Lo: 60°F Lo: 16°C |
Monday... Low clouds and fog in the morning then sunny. Highs in the mid 70s to lower 80s. |
| Tue Hi: 80°FHi: 27°C Lo: 63°F Lo: 17°C |
Tuesday... Areas of low clouds and fog in the morning then sunny. Highs in the upper 70s to mid 80s. |
| Wed Hi: 86°FHi: 30°C Lo: 65°F Lo: 18°C |
Wednesday... Sunny. Highs in the mid 80s to around 90. |
| Thu Hi: 90°FHi: 32°C Lo: 67°F Lo: 19°C |
Thursday... Sunny. Highs in the upper 80s to mid 90s. |
| Fri Hi: 90°FHi: 32°C Lo: 66°F Lo: 19°C |
Friday... Sunny. Highs in the upper 80s to mid 90s. |
| Sat Hi: 90°FHi: 32°C |
Saturday... Partly cloudy in the morning then sunny. Highs around 90. |
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