Weather in Castro Valley, CA
Castro Valley, Saturday, 31 October, 13:05
Clear. Feels like 62°. High 64°, low 49°.
Monthly outlook for Castro Valley, CA: average high 71°, average low 53.5°. That is 3° above the climate normal for October. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 8 November (79°), the coolest 5 November (44.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 31 October – 9 November | 69.8° | 66.8° | +1.7° |
| 10 November – 19 November | 73° | 63° | +5.5° |
| 20 November – 29 November | at normal | 60° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Cherryland (3 mi).
0.06
Castro Valley, Sunday, 1 November
Rain. High 64°, low 48°.
0
Castro Valley, Monday, 2 November
Overcast. High 67°, low 46°.
0.36Castro Valley, Tuesday, 3 November
Rain. High 62°, low 52°.
0Castro Valley, Wednesday, 4 November
Clear. High 65°, low 48°.
0Castro Valley, Thursday, 5 November
Overcast. High 67°, low 45°.
0Castro Valley, Friday, 6 November
Overcast. High 75°, low 54°.
0Castro Valley, Saturday, 7 November
Overcast. High 78°, low 58°.
0
Castro Valley, Sunday, 8 November
Partly cloudy. High 79°, low 58°.
0Castro Valley, Monday, 9 November
Overcast. High 77°, low 59°.
0Castro Valley, Tuesday, 10 November
Partly cloudy. High 74°, low 57°.
0Castro Valley, Wednesday, 11 November
Overcast. High 71°, low 55°.
0Castro Valley, Thursday, 12 November
Clear. High 71°, low 55°.
0Castro Valley, Friday, 13 November
Overcast. High 74°, low 55°.
0Castro Valley, Saturday, 14 November
Overcast. High 73°, low 57°.
0Castro Valley, Sunday, 15 November
Overcast. High 75°, low 59°.
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.
0.06
Castro 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.
0.12Castro Valley, Sunday, 29 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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