Hourly Weather Forecast - Castro Valley, CA

12 AM
48°F
0%
5mph
S
Mostly Cloudy
Humidity
88%
Feels like
46°F
Dew Point
44°F
1 AM
48°F
10%
5mph
S
Mostly Cloudy
Humidity
88%
Feels like
46°F
Dew Point
44°F
2 AM
48°F
10%
5mph
S
Cloudy
Humidity
89%
Feels like
46°F
Dew Point
45°F
3 AM
49°F
10%
5mph
SSW
Mostly Cloudy
Humidity
89%
Feels like
46°F
Dew Point
46°F
4 AM
49°F
10%
5mph
SSW
Mostly Cloudy
Humidity
90%
Feels like
47°F
Dew Point
46°F
5 AM
50°F
10%
5mph
SSW
Mostly Cloudy
Humidity
89%
Feels like
48°F
Dew Point
47°F
6 AM
50°F
0%
6mph
S
Mostly Cloudy
Humidity
91%
Feels like
50°F
Dew Point
47°F
7 AM
51°F
10%
6mph
S
Mostly Cloudy
Humidity
91%
Feels like
51°F
Dew Point
48°F
7:18 AM
8 AM
51°F
10%
6mph
S
Partly Cloudy
Humidity
92%
Feels like
51°F
Dew Point
49°F
9 AM
52°F
10%
7mph
S
Partly Cloudy
Humidity
93%
Feels like
52°F
Dew Point
50°F
10 AM
54°F
10%
8mph
S
Partly Cloudy
Humidity
90%
Feels like
54°F
Dew Point
51°F
11 AM
56°F
10%
8mph
S
Partly Cloudy
Humidity
89%
Feels like
56°F
Dew Point
53°F
12 PM
57°F
10%
9mph
SSW
Mostly Cloudy
Humidity
87%
Feels like
57°F
Dew Point
53°F
1 PM
58°F
30%
9mph
SSW
30% Chance of Light Rain
Humidity
87%
Feels like
58°F
Dew Point
54°F
2 PM
57°F
30%
9mph
SSW
30% Chance of Light Rain
Humidity
87%
Feels like
57°F
Dew Point
53°F
3 PM
55°F
30%
8mph
SSW
30% Chance of Light Rain
Humidity
91%
Feels like
55°F
Dew Point
53°F
4 PM
53°F
40%
8mph
SSW
40% Chance of Light Rain
Humidity
93%
Feels like
53°F
Dew Point
51°F
4:52 PM
5 PM
52°F
60%
8mph
SSW
60% Chance of Light Rain
Humidity
93%
Feels like
52°F
Dew Point
50°F
6 PM
52°F
50%
8mph
S
50% Chance of Light Rain
Humidity
93%
Feels like
52°F
Dew Point
50°F
7 PM
52°F
40%
8mph
S
40% Chance of Light Rain
Humidity
92%
Feels like
52°F
Dew Point
50°F
8 PM
53°F
60%
7mph
S
60% Chance of Light Rain
Humidity
91%
Feels like
53°F
Dew Point
50°F
9 PM
53°F
60%
7mph
S
60% Chance of Light Rain
Humidity
91%
Feels like
53°F
Dew Point
50°F
10 PM
53°F
60%
7mph
S
60% Chance of Light Rain
Humidity
92%
Feels like
53°F
Dew Point
50°F
11 PM
53°F
50%
6mph
S
50% Chance of Light Rain
Humidity
93%
Feels like
53°F
Dew Point
51°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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