Hourly Weather Forecast - Castro Valley, CA

12 AM
46°F
50%
7mph
SSE
50% Chance Rain Showers
Humidity
90%
Feels like
42°F
Dew Point
43°F
1 AM
46°F
50%
7mph
SSE
50% Chance Rain Showers
Humidity
90%
Feels like
42°F
Dew Point
43°F
2 AM
46°F
50%
7mph
SE
50% Chance Rain Showers
Humidity
91%
Feels like
42°F
Dew Point
43°F
3 AM
46°F
50%
7mph
SE
50% Chance Rain Showers
Humidity
91%
Feels like
42°F
Dew Point
43°F

Snow and Ice Forecast Through Monday

Storm Brings Heavy Midwestern Snow, New England Icing

A winter storm will deliver snow and significant icing from the Midwest to New England.

Today's Weather Outlook

Today's Weather Outlook

Satellite image of Hurricane Melissa

2025 Year in Review: Powerful Hurricanes in the Atlantic

A frame from an automated video of a tornado and its mesocyclone that derailed multiple train cars near Enderlin, North Dakota and destroyed multiple homes on June 20, 2025. (ChrisWx via Wikimedia Commons)

2025 Year in Review: Extreme Weather - January through June

Photos and videos from the Palisades Fire that started in the City of Los Angeles, January 8, 2025. (CAL FIRE_Official via Wikimedia Commons)

2025 Year in Review: Billion Dollar Disasters - The California Wildfires

Hurricane Erick at its peak intensity before making landfall on Guerrero, Mexico on June 19, 2025 (NOAA/Wikimedia Commons)

2025 Year in Review: Active Tropical Season for The Pacific

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide