7-Day Forecast Summary
7-Day Detailed Weather Forecast for Diamond Bar
Overnight |
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Temperature: 61°F Wind Speed: 0 to 5 mph Wind Direction: SW Forecast: Mostly clear, with a low around 61. Southwest wind 0 to 5 mph. |
Monday |
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Temperature: 87°F Wind Speed: 0 to 10 mph Wind Direction: WSW Forecast: Sunny, with a high near 87. West southwest wind 0 to 10 mph. |
Monday Night |
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Temperature: 60°F Wind Speed: 0 to 10 mph Wind Direction: WSW Forecast: Mostly clear, with a low around 60. West southwest wind 0 to 10 mph. |
Tuesday |
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Temperature: 85°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Sunny, with a high near 85. Southwest wind 0 to 10 mph. |
Tuesday Night |
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Temperature: 59°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Mostly clear, with a low around 59. Southwest wind 0 to 10 mph. |
Wednesday |
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Temperature: 79°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Sunny, with a high near 79. |
Wednesday Night |
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Temperature: 58°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Partly cloudy, with a low around 58. |
Thursday |
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Temperature: 78°F Wind Speed: 0 to 10 mph Wind Direction: SSW Forecast: Sunny, with a high near 78. |
Thursday Night |
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Temperature: 57°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Mostly clear, with a low around 57. |
Juneteenth |
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Temperature: 78°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Sunny, with a high near 78. |
Friday Night |
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Temperature: 55°F Wind Speed: 0 to 10 mph Wind Direction: SSW Forecast: Mostly clear, with a low around 55. |
Saturday |
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Temperature: 77°F Wind Speed: 0 to 10 mph Wind Direction: SSW Forecast: Sunny, with a high near 77. |
Saturday Night |
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Temperature: 55°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Mostly clear, with a low around 55. |
Sunday |
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Temperature: 77°F Wind Speed: 0 to 10 mph Wind Direction: SW Forecast: Sunny, with a high near 77. |

