Weather in Diamond Bar, CA
Diamond Bar, Thursday, 22 October, 03:37
Overcast. Feels like 61°. High 65°, low 57°.
Monthly outlook for Diamond Bar, CA: average high 76°, average low 62.7°. That is 0° below the climate normal for October. Precipitation is expected on 4 days (about 0.9 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 5 November (84.8°), the coolest 24 October (52.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 22 October – 31 October | 74.5° | 76.5° | -1.1° |
| 1 November – 10 November | 78.6° | 73.8° | +2.7° |
| 11 November – 20 November | at normal | 70.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Pomona (5 mi).
0.09
Diamond Bar, Friday, 23 October
Rain. High 68°, low 54°.
0
Diamond Bar, Saturday, 24 October
Clear. High 75°, low 53°.
0Diamond Bar, Sunday, 25 October
Clear. High 78°, low 55°.
0Diamond Bar, Monday, 26 October
Overcast. High 80°, low 57°.
0
Diamond Bar, Tuesday, 27 October
Mostly clear. High 80°, low 57°.
0Diamond Bar, Wednesday, 28 October
Overcast. High 77°, low 68°.
0Diamond Bar, Thursday, 29 October
Overcast. High 74°, low 66°.
0
Diamond Bar, Friday, 30 October
Partly cloudy. High 75°, low 65°.
0Diamond Bar, Saturday, 31 October
Overcast. High 72°, low 63°.
0.24Diamond Bar, Sunday, 1 November
Light rain. High 69°, low 62°.
0.07Diamond Bar, Monday, 2 November
Light rain. High 76°, low 64°.
0Diamond Bar, Tuesday, 3 November
Partly cloudy. High 80°, low 69°.
0Diamond Bar, Wednesday, 4 November
Clear. High 83°, low 70°.
0Diamond Bar, Thursday, 5 November
Clear. High 85°, low 72°.
0Diamond Bar, Friday, 6 November
Overcast. High 79°, low 71°.
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.
0.04Diamond Bar, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.06Diamond Bar, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.04Diamond Bar, Thursday, 19 November
Climate normal for this date — 60-year average.
0.06Diamond Bar, Friday, 20 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
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