The National Weather Service forecast for Diamond Bar-Walnut:
- Friday: Sunny, with a high near 81. Southwest wind around 10 mph, with gusts as high as 15 mph.
- Friday Night: Mostly clear, with a low around 61. Southwest wind 5 to 10 mph becoming light south in the evening. Winds could gust as high as 15 mph.
- Saturday: Sunny, with a high near 86. Light west southwest wind becoming southwest 5 to 10 mph in the afternoon.
- Saturday Night: Mostly clear, with a low around 61. Southwest wind 5 to 10 mph becoming light south southwest in the evening. Winds could gust as high as 15 mph.
- Sunday: Sunny, with a high near 88. Light south southwest wind becoming southwest 5 to 10 mph in the afternoon.
- Sunday Night: Mostly clear, with a low around 62.
- Monday: Sunny, with a high near 87.
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