National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the northwestern U.S. this weekend

A Pacific storm system will continue to impact the West Coast through Sunday. Heavy rainfall could lead to flash flooding, river and small stream flooding, as well as mudslides and debris flows, especially over burn scars. At higher elevations, strong winds and heavy snowfall, with accumulations of 1 to 3 feet, could result in hazardous travel through mountain passes.
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Current Conditions

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Castro Valley CA

7 Day Forecast

Tonight

Chance Showers Chance for Measurable Precipitation 30%

Chance
Showers

Low: 53 °F

Sunday

Mostly Cloudy

Mostly
Cloudy

High: 63 °F

Sunday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 51 °F

Monday

Mostly Sunny

Mostly
Sunny

High: 65 °F

Monday
Night

Mostly Clear

Mostly
Clear

Low: 49 °F

Tuesday

Sunny

Sunny

High: 65 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 49 °F

Wednesday

Mostly Sunny

Mostly
Sunny

High: 63 °F

Wednesday
Night

Slight Chance Rain

Slight Chc
Rain

Low: 47 °F

Detailed Forecast

  • Tonight A 30 percent chance of showers, mainly after 10pm. Mostly cloudy, with a low around 53. South wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.
  • Sunday Mostly cloudy, with a high near 63. Light and variable wind becoming west 5 to 7 mph in the afternoon.
  • Sunday Night Mostly cloudy, with a low around 51. West wind around 5 mph becoming calm in the evening.
  • Monday Mostly sunny, with a high near 65. Calm wind becoming north northwest 5 to 7 mph in the morning.
  • Monday Night Mostly clear, with a low around 49. North northeast wind around 6 mph.
  • Tuesday Sunny, with a high near 65.
  • Tuesday Night Partly cloudy, with a low around 49.
  • Wednesday Mostly sunny, with a high near 63.
  • Wednesday Night A slight chance of rain. Partly cloudy, with a low around 47.
  • Christmas Day Mostly sunny, with a high near 60.
  • Thursday Night Mostly clear, with a low around 43.
  • Friday Sunny, with a high near 59.
  • Friday Night Mostly clear, with a low around 43.
  • Saturday Sunny, with a high near 60.