Weather in Diamond Bar, CA
Diamond Bar, Sunday, 18 October, 04:10
Clear. Feels like 66°. High 87°, low 67°.
Monthly outlook for Diamond Bar, CA: average high 81.9°, average low 67.3°. That is 2.7° above the climate normal for October. Precipitation is expected on 2 days (about 0.8 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 25 October (90.2°), the coolest 23 October (56.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 83.1° | 78.2° | +2.8° |
| 28 October – 6 November | 79.8° | 75° | +2.6° |
| 7 November – 16 November | at normal | 71.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Pomona (5 mi).
0
Diamond Bar, Monday, 19 October
Clear. High 86°, low 70°.
0Diamond Bar, Tuesday, 20 October
Clear. High 86°, low 65°.
0.19
Diamond Bar, Wednesday, 21 October
Light rain. High 79°, low 62°.
0.59Diamond Bar, Thursday, 22 October
Rain. High 71°, low 59°.
0Diamond Bar, Friday, 23 October
Clear. High 74°, low 57°.
0Diamond Bar, Saturday, 24 October
Clear. High 85°, low 68°.
0Diamond Bar, Sunday, 25 October
Clear. High 90°, low 73°.
0Diamond Bar, Monday, 26 October
Clear. High 90°, low 75°.
0
Diamond Bar, Tuesday, 27 October
Overcast. High 84°, low 72°.
0
Diamond Bar, Wednesday, 28 October
Partly cloudy. High 80°, low 69°.
0Diamond Bar, Thursday, 29 October
Partly cloudy. High 79°, low 67°.
0Diamond Bar, Friday, 30 October
Clear. High 80°, low 67°.
0Diamond Bar, Saturday, 31 October
Clear. High 81°, low 67°.
0Diamond Bar, Sunday, 1 November
Overcast. High 80°, low 69°.
0Diamond Bar, Monday, 2 November
Overcast. High 77°, low 70°.
0
Diamond Bar, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.03Diamond Bar, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.01Diamond Bar, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Diamond Bar, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Diamond Bar, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Diamond Bar, Sunday, 8 November
Climate normal for this date — 60-year average.
0.05Diamond Bar, Monday, 9 November
Climate normal for this date — 60-year average.
0.04Diamond Bar, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.06Diamond Bar, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.04Diamond Bar, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04Diamond Bar, Friday, 13 November
Climate normal for this date — 60-year average.
0.04Diamond Bar, Saturday, 14 November
Climate normal for this date — 60-year average.
0.07Diamond Bar, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Diamond Bar, Monday, 16 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Diamond Bar, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Diamond Bar, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
31°Weather in Annapolis, MD45°Weather in Atlanta, GA47°Weather in Augusta, ME28°Weather in Austin, TX50°Weather in Baton Rouge, LA50°Weather in Bismarck, ND49°Weather in Boise, ID54°Weather in Boston, MA34°Weather in Carson City, NV45°Weather in Charleston, WV37°Weather in Charlotte Amalie, VI81°Weather in Cheyenne, WY45°Weather in Columbia, SC46°Weather in Columbus, OH36°Weather in Concord, NH28°Weather in Denver, CO
50°Weather in Des Moines, IA43°Weather in Dover, DE39°Weather in Frankfort, KY36°Weather in Harrisburg, PA35°Weather in Hartford, CT32°Weather in Helena, MT48°Weather in Honolulu, HI74°Weather in Indianapolis, IN38°Weather in Jackson, MS49°Weather in Jefferson City, MO37°Weather in Juneau, AK37°Weather in Lansing, MI36°Weather in Lincoln, NE45°Weather in Little Rock, AR45°Weather in Madison, WI41°Weather in Montgomery, AL48°Weather in Montpelier, VT27°Weather in Nashville, TN43°Weather in Oklahoma City, OK44°Weather in Olympia, WA41°Weather in Phoenix, AZ68°Weather in Pierre, SD43°Weather in Providence, RI32°Weather in Raleigh, NC42°Weather in Richmond, VA41°Weather in Sacramento, CA59°Weather in Salem, OR44°Weather in Salt Lake City, UT53°Weather in San Juan, PR76°Weather in Santa Fe, NM40°Weather in Springfield, IL39°Weather in St. Paul, MN48°Weather in Tallahassee, FL53°Weather in Topeka, KS40°Weather in Trenton, NJ37°Weather in Washington, DC40°52°Weather in Douglas Park, CA52°Weather in Drakesbad, CA36°Weather in Duncan Springs, CA50°Weather in Dunderberg Mill, CA29°Weather in East Arboga, CA58°Weather in East Biggs, CA58°Weather in East Garrison, CA58°Weather in East Pleasanton, CA55°Weather in East Side, CA53°Weather in East Windsor, CA54°Weather in Eastport, CA55°Weather in Eckley, CA60°Weather in Eder, CA38°Weather in Edmiston, CA66°Weather in Edwin, CA69°Weather in El Bonita, CA55°Weather in El Camino, CA56°Weather in El Campo, CA58°Weather in El Pinal, CA55°