Hourly Weather Forecast - Castro Valley, CA

12 AM
50°F
0%
7mph
NNW
Mostly Cloudy
Humidity
75%
Feels like
47°F
Dew Point
42°F
1 AM
49°F
0%
8mph
N
Mostly Cloudy
Humidity
74%
Feels like
46°F
Dew Point
41°F
2 AM
49°F
0%
8mph
N
Partly Cloudy
Humidity
72%
Feels like
45°F
Dew Point
40°F
3 AM
48°F
0%
8mph
N
Mostly Clear
Humidity
72%
Feels like
44°F
Dew Point
39°F
4 AM
47°F
0%
8mph
N
Partly Cloudy
Humidity
69%
Feels like
43°F
Dew Point
37°F
5 AM
46°F
0%
8mph
N
Partly Cloudy
Humidity
73%
Feels like
43°F
Dew Point
38°F
6 AM
47°F
0%
7mph
N
Cloudy
Humidity
71%
Feels like
43°F
Dew Point
38°F
6:32 AM
7 AM
49°F
0%
7mph
N
Cloudy
Humidity
66%
Feels like
46°F
Dew Point
39°F
8 AM
54°F
0%
7mph
N
Cloudy
Humidity
58%
Feels like
54°F
Dew Point
40°F
9 AM
60°F
0%
8mph
N
Mostly Sunny
Humidity
49%
Feels like
60°F
Dew Point
40°F
10 AM
64°F
0%
9mph
N
Sunny
Humidity
41%
Feels like
64°F
Dew Point
40°F
11 AM
68°F
0%
10mph
N
Sunny
Humidity
36%
Feels like
68°F
Dew Point
40°F
12 PM
71°F
0%
11mph
N
Sunny
Humidity
33%
Feels like
71°F
Dew Point
40°F
1 PM
72°F
0%
11mph
N
Sunny
Humidity
32%
Feels like
72°F
Dew Point
41°F
2 PM
73°F
0%
11mph
N
Sunny
Humidity
32%
Feels like
73°F
Dew Point
41°F
3 PM
73°F
0%
11mph
N
Sunny
Humidity
32%
Feels like
73°F
Dew Point
41°F
4 PM
71°F
0%
11mph
N
Sunny
Humidity
35%
Feels like
71°F
Dew Point
42°F
5 PM
68°F
0%
9mph
N
Sunny
Humidity
40%
Feels like
68°F
Dew Point
43°F
6 PM
64°F
0%
8mph
N
Sunny
Humidity
47%
Feels like
64°F
Dew Point
44°F
6:06 PM
7 PM
61°F
0%
6mph
N
Clear
Humidity
53%
Feels like
61°F
Dew Point
44°F
8 PM
59°F
0%
6mph
N
Clear
Humidity
59%
Feels like
59°F
Dew Point
44°F
9 PM
56°F
0%
6mph
N
Clear
Humidity
64%
Feels like
56°F
Dew Point
44°F
10 PM
55°F
0%
6mph
N
Clear
Humidity
68%
Feels like
55°F
Dew Point
44°F
11 PM
53°F
0%
6mph
N
Clear
Humidity
71%
Feels like
53°F
Dew Point
44°F

Snow and Ice Accumulations through Tuesday AM

Wintry Disturbance Bisects U.S. Mid-Latitudes

A wintry disturbance will bring icing and light snow from the central Plains today through the Northeast on Tuesday.

Today's Weather Outlook

Today's Weather Outlook

Weekly Drought Map for February 26, 2026

Widespread Drought Degradation For South, Southeast; Mixed Results Elsewhere

Debris flies through the air as howling winds accompanied by a line of storms approach the old Tarrant County Courthouse in downtown Fort Worth, Texas, on March 2, 2023. (Tom Fox/The Dallas Morning News via AP)

Lightning Season Rapidly Approaching: Best Safety Practices

Rocky Mountain National Park at day in December. (NPS Natural Resources/Wikimedia Commons)

Snowmelt and Flooding

U.S. Route 52 near St. Donatus between Bellevue and Dubuque, Iowa. (Tony Webster from Portland, Oregon)

Winter Weather Driving Safety Tips

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