Castro Valley is located in Alameda County, California. This page shows active weather alerts affecting Castro Valley issued by the National Weather Service.
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Castro Valley, California faces weather hazards shaped by its location in one of the world's most climatically diverse states. Depending on its region, threats may include wildfire, atmospheric river flooding, extreme heat, or coastal storms — all of which are monitored by the National Weather Service.
Common alert types for this area:
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