Hourly Weather Forecast - Castro Valley, CA

12 AM
53°F
40%
12mph
S
40% Chance of Light Rain
Humidity
86%
Feels like
53°F
Dew Point
49°F
1 AM
53°F
40%
12mph
S
40% Chance of Light Rain
Humidity
86%
Feels like
53°F
Dew Point
48°F
2 AM
53°F
40%
12mph
S
40% Chance of Light Rain
Humidity
86%
Feels like
53°F
Dew Point
49°F
3 AM
53°F
40%
11mph
S
40% Chance of Light Rain
Humidity
85%
Feels like
53°F
Dew Point
48°F
4 AM
53°F
50%
11mph
S
50% Chance of Light Rain
Humidity
86%
Feels like
53°F
Dew Point
49°F
5 AM
53°F
60%
11mph
S
60% Chance of Light Rain
Humidity
87%
Feels like
53°F
Dew Point
49°F
6 AM
52°F
60%
11mph
S
60% Chance of Light Rain
Humidity
88%
Feels like
52°F
Dew Point
49°F
7 AM
53°F
60%
11mph
S
60% Chance of Light Rain
Humidity
90%
Feels like
53°F
Dew Point
50°F
7:20 AM
8 AM
53°F
60%
11mph
S
60% Chance of Light Rain
Humidity
90%
Feels like
53°F
Dew Point
50°F
9 AM
53°F
60%
11mph
S
60% Chance of Light Rain
Humidity
91%
Feels like
53°F
Dew Point
50°F
10 AM
54°F
60%
11mph
S
60% Chance of Light Rain
Humidity
90%
Feels like
54°F
Dew Point
51°F
11 AM
55°F
60%
12mph
S
60% Chance of Light Rain
Humidity
91%
Feels like
55°F
Dew Point
52°F
12 PM
56°F
60%
11mph
S
60% Chance of Light Rain
Humidity
90%
Feels like
56°F
Dew Point
53°F
1 PM
56°F
60%
11mph
S
60% Chance of Light Rain
Humidity
91%
Feels like
56°F
Dew Point
54°F
2 PM
55°F
60%
11mph
S
60% Chance of Light Rain
Humidity
92%
Feels like
55°F
Dew Point
53°F
3 PM
54°F
60%
10mph
S
60% Chance Rain Showers
Humidity
95%
Feels like
54°F
Dew Point
52°F
4 PM
52°F
60%
9mph
S
60% Chance Rain Showers
Humidity
95%
Feels like
52°F
Dew Point
50°F
4:53 PM
5 PM
51°F
60%
9mph
S
60% Chance of Light Rain
Humidity
94%
Feels like
51°F
Dew Point
49°F
6 PM
51°F
60%
8mph
S
60% Chance of Light Rain
Humidity
92%
Feels like
51°F
Dew Point
48°F
7 PM
51°F
60%
8mph
S
60% Chance of Light Rain
Humidity
90%
Feels like
51°F
Dew Point
48°F
8 PM
51°F
70%
8mph
S
70% Chance of Light Rain
Humidity
89%
Feels like
51°F
Dew Point
48°F
9 PM
51°F
70%
7mph
S
70% Chance of Light Rain
Humidity
89%
Feels like
51°F
Dew Point
48°F
10 PM
51°F
60%
7mph
SSE
60% Chance of Light Rain
Humidity
90%
Feels like
51°F
Dew Point
48°F
11 PM
50°F
50%
7mph
SSE
50% Chance of Light Rain
Humidity
90%
Feels like
50°F
Dew Point
48°F

Forecast Peak Wind Gusts Today

High Winds, Rain, and Snow Cross the Country

A clipper moving over the Great Lakes brings rain, snow, and high winds through the Atlantic Coastline.

Rainfall and Snowfall Totals Through Friday

Atmospheric River Symptoms Repeat in the Northwest

Friday's Weather Outlook

Friday's Weather Outlook

Friday's Weather Outlook

Weekend Weather Preview

Flu Update Valid For Week Ending December 6, 2025

Weekly Flu Update: Flu Exceeds Annual Baseline

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

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