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This week's forecast shows temperatures running 3°F above the historical average for October-November. Normal highs for this period are around 76°F with lows around 51°F.
1987 - Halloween was a wet one in the southwestern U.S. Heavy rain in southern California resulted in numerous mudslides. Weather-related auto accidents resulted in three deaths and twenty-five injuries. Mount Wilson CA received 3.14 inches of rain in 24 hours. Yakima WA reported measurable rainfall for the first time since the 18th of July. The 103 day long dry spell was their longest of record.
More on this and other weather history
 
Day: Patchy fog before 11am. Mostly sunny, with a high near 81. East southeast wind 0 to 10 mph.
 
Night: Clear, with a low around 56. West wind 0 to 5 mph.
 
Day: Sunny, with a high near 84. West southwest wind 0 to 5 mph.
 
Night: Mostly clear, with a low around 57. North northwest wind 0 to 5 mph.
 
Day: Sunny, with a high near 84.
 
Night: Clear, with a low around 57.
 
Day: Sunny, with a high near 80.
 
Night: Patchy fog after 10pm. Partly cloudy, with a low around 54.
 
Day: Patchy fog before 10am. Mostly sunny, with a high near 76.
 
Night: Patchy fog between 10pm and 4am. Partly cloudy, with a low around 54.
 
Day: Mostly sunny, with a high near 74.
 
Night: Patchy fog after 4am. Mostly cloudy, with a low around 53.
 
Day: Patchy fog before 10am. Mostly sunny, with a high near 72.
 
   
Thu's High Temperature
98 at 2 Miles West Of Pala, CA and 6 Miles West-southwest Of Glamis, CA
Thu's Low Temperature
10 at 4 Miles Northwest Of Grand Lake, CO and 2 Miles Southwest Of Canyon Village, WY

Diamond Bar is a city in eastern Los Angeles County, California, United States. The 2020 census listed a population of 55,072. It is one of a few cities in California with a majority Asian population (59.24% as of 2020). It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederic E. Lewis (1884–1963). The city features a public Los Angeles County golf course.
Located at the junction of the Pomona and Orange freeways, Diamond Bar is primarily residential with shopping centers interspersed throughout the city. It is surrounded by the cities of Brea, Walnut, Chino Hills, Pomona, City of Industry, and the unincorporated areas of Rowland Heights and South Diamond Bar.
Northern Diamond Bar is a part of the Pomona Unified School District. Southern Diamond Bar is a part of the Walnut Valley Unified School District. The city is also served by International Polytechnic High School. It also has the first hydrogen fueling station to be built in Southern California, near the South Coast Air Quality Management District building.
Content from Wikipedia, licensed under CC BY-SA 3.0.
Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.
Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.