| National Weather Service Forecast for:
Diamond Bar CA Issued by: National Weather Service Los Angeles/Oxnard, CA |
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| Updated: 11:27 am PDT Apr 6, 2026 | ||||||||||||||||||
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| Tonight |
Clear, with a low around 53. Southwest wind around 5 mph becoming calm in the evening. |
| Tuesday |
Sunny, with a high near 77. Light south wind becoming southwest 5 to 10 mph in the afternoon. |
| Tuesday Night |
Clear, with a low around 55. Southwest wind 5 to 10 mph becoming light south in the evening. |
| Wednesday |
Sunny, with a high near 79. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. |
| Wednesday Night |
Mostly clear, with a low around 56. Southwest wind 5 to 10 mph becoming light south in the evening. |
| Thursday |
Partly sunny, with a high near 77. |
| Thursday Night |
Partly cloudy, with a low around 55. |
| Friday |
A slight chance of rain. Mostly sunny, with a high near 74. |
| Friday Night |
A chance of rain and thunderstorms. Mostly cloudy, with a low around 55. |
| Saturday |
Rain likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 68. |
| Saturday Night |
A chance of rain. Mostly cloudy, with a low around 52. |
| Sunday |
A slight chance of rain. Partly sunny, with a high near 67. |
| Sunday Night |
Partly cloudy, with a low around 50. |
| Monday |
Mostly sunny, with a high near 71. |
Forecast from NOAA-NWS for Diamond Bar CA.
