Weather in Diamond Bar, CA
Diamond Bar, Monday, 19 October, 04:35
Clear. Feels like 63°. High 85°, low 64°.
Monthly outlook for Diamond Bar, CA: average high 77.5°, average low 64.2°. That is 0.4° above the climate normal for October. Precipitation is expected on 3 days (about 1.7 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 26 October (90.4°), the coolest 24 October (55.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 80.6° | 77.8° | +1.6° |
| 29 October – 7 November | 72.4° | 74.7° | -1.3° |
| 8 November – 17 November | at normal | 71.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Pomona (5 mi).
0
Diamond Bar, Tuesday, 20 October
Clear. High 84°, low 64°.
0.24
Diamond Bar, Wednesday, 21 October
Rain. High 79°, low 62°.
1.35Diamond Bar, Thursday, 22 October
Heavy rain. High 67°, low 59°.
0Diamond Bar, Friday, 23 October
Light rain. High 70°, low 56°.
0Diamond Bar, Saturday, 24 October
Clear. High 77°, low 56°.
0Diamond Bar, Sunday, 25 October
Clear. High 89°, low 71°.
0
Diamond Bar, Monday, 26 October
Overcast. High 90°, low 74°.
0Diamond Bar, Tuesday, 27 October
Clear. High 84°, low 71°.
0Diamond Bar, Wednesday, 28 October
Clear. High 81°, low 68°.
0Diamond Bar, Thursday, 29 October
Overcast. High 75°, low 67°.
0Diamond Bar, Friday, 30 October
Overcast. High 73°, low 65°.
0.01Diamond Bar, Saturday, 31 October
Light rain. High 72°, low 64°.
0.14Diamond Bar, Sunday, 1 November
Light rain. High 70°, low 62°.
0Diamond Bar, Monday, 2 November
Clear. High 72°, low 62°.
0Diamond Bar, Tuesday, 3 November
Overcast. High 72°, low 62°.
0.03
Diamond 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.
0.09
Diamond 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.
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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