NimbocastCastro Valley, CA Weather
Live radar, hourly and 7-day forecast, and National Weather Service alerts for Castro Valley, Alameda County, California.
Updated Jul 29, 2026, 2:05 PM local time · Radar refreshes every 5 minutes
☀️
Castro Valley
74°F
Wind 9 mph
Humidity 59%
Cloud cover 7%
UV index 8
Alerts 0
Active alerts
✓
No active National Weather Service alerts for Castro Valley, CA.
Castro Valley weather radar
Light
Heavy
Next 24 hours
Now
☀️
74°F
3 PM
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73°F
4 PM
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72°F
5 PM
☀️
71°F
6 PM
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67°F
7 PM
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65°F
8 PM
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62°F
9 PM
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61°F
10 PM
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60°F
1%
11 PM
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59°F
12 AM
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58°F
1 AM
☀️
58°F
2 AM
☀️
58°F
1%
3 AM
☀️
58°F
1%
4 AM
☀️
58°F
1%
5 AM
☀️
57°F
6 AM
☀️
57°F
7 AM
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59°F
8 AM
🌤️
61°F
9 AM
☀️
63°F
10 AM
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67°F
11 AM
☀️
70°F
12 PM
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73°F
1 PM
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74°F
7-day forecast
Today
Jul 29
🌫️
74°F
59°F
1%
Thu
Jul 30
🌤️
75°F
57°F
1%
Fri
Jul 31
☀️
78°F
55°F
3%
Sat
Aug 1
☁️
80°F
61°F
Sun
Aug 2
☀️
80°F
61°F
Mon
Aug 3
☀️
81°F
62°F
Tue
Aug 4
☀️
84°F
63°F
Weather near Castro Valley
2 mi
Hayward, CA2 mi
Ashland, CA3 mi
San Lorenzo, CA4 mi
San Leandro, CA8 mi
San Ramon, CA8 mi
Union City, CA8 mi
Dublin, CA10 mi
Danville, CA
Alerts are relayed from the National Weather Service and may lag
the official source. In a life-threatening situation always follow
weather.gov and local emergency
broadcasts.