Weather in Diamond Bar, CA
Diamond Bar, Monday, 9 November, 00:01
Clear. Feels like 66°. High 87°, low 62°.
Monthly outlook for Diamond Bar, CA: average high 74.3°, average low 60.8°. That is 2.3° above the climate normal for November. Precipitation is expected on 6 days (about 3.0 inches), against a normal of 2 days and 0.8 inches. The warmest day looks like 11 November (89.1°), the coolest 24 November (58.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 November – 18 November | 79° | 70.9° | +4.5° |
| 19 November – 28 November | 66.6° | 68.1° | -0.9° |
| 29 November – 8 December | at normal | 65.8° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Pomona (5 mi).
0
Diamond Bar, Tuesday, 10 November
Clear. High 88°, low 61°.
0Diamond Bar, Wednesday, 11 November
Clear. High 89°, low 59°.
0Diamond Bar, Thursday, 12 November
Clear. High 85°, low 60°.
0
Diamond Bar, Friday, 13 November
Overcast. High 83°, low 62°.
0.12
Diamond Bar, Saturday, 14 November
Light rain. High 75°, low 59°.
0.08Diamond Bar, Sunday, 15 November
Light rain. High 67°, low 62°.
0Diamond Bar, Monday, 16 November
Overcast. High 69°, low 60°.
0Diamond Bar, Tuesday, 17 November
Overcast. High 73°, low 62°.
0Diamond Bar, Wednesday, 18 November
Overcast. High 75°, low 64°.
0.07Diamond Bar, Thursday, 19 November
Light rain. High 72°, low 63°.
2.07Diamond Bar, Friday, 20 November
Heavy rain. High 65°, low 61°.
0.58Diamond Bar, Saturday, 21 November
Rain. High 67°, low 59°.
0.05Diamond Bar, Sunday, 22 November
Light rain. High 64°, low 60°.
0
Diamond Bar, Monday, 23 November
Mostly clear. High 66°, low 59°.
0Diamond Bar, Tuesday, 24 November
Overcast. High 64°, low 58°.
0.06Diamond Bar, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.07Diamond Bar, Thursday, 26 November
Climate normal for this date — 60-year average.
0.04Diamond Bar, Friday, 27 November
Climate normal for this date — 60-year average.
0.09Diamond Bar, Saturday, 28 November
Climate normal for this date — 60-year average.
0.13Diamond Bar, Sunday, 29 November
Climate normal for this date — 60-year average.
0.07
Diamond Bar, Monday, 30 November
Climate normal for this date — 60-year average.
0.02Diamond Bar, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.03Diamond Bar, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.09Diamond Bar, Thursday, 3 December
Climate normal for this date — 60-year average.
0.1Diamond Bar, Friday, 4 December
Climate normal for this date — 60-year average.
0.08Diamond Bar, Saturday, 5 December
Climate normal for this date — 60-year average.
0.13Diamond Bar, Sunday, 6 December
Climate normal for this date — 60-year average.
0.13Diamond Bar, Monday, 7 December
Climate normal for this date — 60-year average.
0.03Diamond Bar, Tuesday, 8 December
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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