Weather in Castro Valley, CA
Castro Valley, Friday, 30 October, 08:00
Partly cloudy. Feels like 53°. High 66°, low 50°.
Monthly outlook for Castro Valley, CA: average high 65.6°, average low 52°. That is 0.1° below the climate normal for October. Precipitation is expected on 6 days (about 1.7 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 8 November (73.5°), the coolest 31 October (45.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 30 October – 8 November | 67.2° | 67.1° | +0.1° |
| 9 November – 18 November | 63° | 63.4° | -0.2° |
| 19 November – 28 November | at normal | 60.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Cherryland (3 mi).
0
Castro Valley, Saturday, 31 October
Mostly clear. High 64°, low 45°.
0.04
Castro Valley, Sunday, 1 November
Light rain. High 64°, low 51°.
0Castro Valley, Monday, 2 November
Partly cloudy. High 69°, low 46°.
0
Castro Valley, Tuesday, 3 November
Overcast. High 71°, low 47°.
0.01Castro Valley, Wednesday, 4 November
Light rain. High 64°, low 55°.
0Castro Valley, Thursday, 5 November
Overcast. High 63°, low 55°.
0Castro Valley, Friday, 6 November
Light rain. High 65°, low 54°.
0Castro Valley, Saturday, 7 November
Mostly clear. High 73°, low 52°.
0Castro Valley, Sunday, 8 November
Overcast. High 74°, low 55°.
0.08Castro Valley, Monday, 9 November
Light rain. High 67°, low 58°.
0.2Castro Valley, Tuesday, 10 November
Light rain. High 67°, low 57°.
1.01Castro Valley, Wednesday, 11 November
Heavy rain. High 60°, low 54°.
0.04Castro Valley, Thursday, 12 November
Light rain. High 61°, low 50°.
0Castro Valley, Friday, 13 November
Overcast. High 64°, low 48°.
0.31Castro Valley, Saturday, 14 November
Rain. High 57°, low 53°.
0.05Castro Valley, Sunday, 15 November
Climate normal for this date — 60-year average.
0.09Castro Valley, Monday, 16 November
Climate normal for this date — 60-year average.
0.11Castro Valley, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.07Castro Valley, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.04Castro Valley, Thursday, 19 November
Climate normal for this date — 60-year average.
0.1Castro Valley, Friday, 20 November
Climate normal for this date — 60-year average.
0.08Castro Valley, Saturday, 21 November
Climate normal for this date — 60-year average.
0.08Castro Valley, Sunday, 22 November
Climate normal for this date — 60-year average.
0.06Castro Valley, Monday, 23 November
Climate normal for this date — 60-year average.
0.07Castro Valley, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.04Castro Valley, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.06Castro Valley, Thursday, 26 November
Climate normal for this date — 60-year average.
0.07Castro Valley, Friday, 27 November
Climate normal for this date — 60-year average.
0.11Castro Valley, Saturday, 28 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 Castro Valley, 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 Castro Valley, 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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