• Early AM

    Dec 18

    Lo 48°

    A brief shower or two

    Outdoor Barbecue Weather
    • Precip
      58%
    • Hi
      RealFeel
      57°
    • Wind
      Speed
      7 mph
    more
  • Today

    Dec 18

    61°Lo 53°

    Mostly cloudy

    Very Good for an outdoor bbq
    • Precip
      17%
    • Hi
      RealFeel
      61°
    • Wind
      Gust
      7 mph
  • Fri

    Dec 19

    61°Lo 49°

    Periods of rain

    Poor for an outdoor bbq
    • Precip
      65%
    • Hi
      RealFeel
      58°
    • Wind
      Gust
      10 mph
    more
  • Sat

    Dec 20

    60°Lo 52°

    Times of clouds and sun

    Very Good for an outdoor bbq
    • Precip
      23%
    • Hi
      RealFeel
      60°
    • Wind
      Gust
      5 mph
    more
  • Sun

    Dec 21

    63°Lo 51°

    Mostly cloudy

    Very Good for an outdoor bbq
    • Precip
      7%
    • Hi
      RealFeel
      63°
    • Wind
      Gust
      7 mph
    more
Next Previous
Light rain 53° RealFeel® 49°

N

E

S

W

  • Humidity: 92%
  • Pressure: 30.09 in
  • UV Index: 0
  • Cloud Cover: 100%
  • Ceiling: 3300 ft
  • Dew Point: 51° F
  • Visibility: 9 mi
5 mph

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:18 AM with 9:34 of sunlight, then sets at 4:52 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:40 AM with 10:53 of moolight, then sets at 2:33 PM

Temperature Summary - 1:56 AM

  Temp (°F)
Now 53°
Yesterday 54°
RealFeel® 49°
RealFeel® Shade 49°
Wind Chill 53°
Dew Point 51°
  Hi / Lo
Previous 6 Hours 55°
  52°
Previous 12 Hours 59°
  51°
Previous 24 Hours 60°
  49°

Temperature History - Dec 18

more Historical Weather Data >
  Today Normal Record 12/18/2013
High 61° N/A N/A 57°
Low 53° N/A N/A 46°

Precipitation Summary - 1:56 AM

  Amount (in)
Previous 1 Hour 0
Previous 3 Hours 0
Previous 6 Hours 0.05
Previous 9 Hours 0.17
Previous 12 Hours 0.2
Previous 18 Hours 0.2
Previous 24 Hours 0.21

Castro Valley Weather Report

San Francisco: Dry Weather Ahead for the Weekend

December 18, 2014; 2:49 AM ET

Conditions will turn dry for San Francisco this weekend and last into next week. more >

Is Your Outdoor Gear Waterproof?

Dec 5, 2012; 5:00 AM ET Now that it's cold enough to hit the slopes, you may want to look more closely at what materials your winter sports gear is made of. As it turns out, not all waterproofing is created equal.

Thu. Outdoor Entertaining

Thu. Wind Maps

Thu. UV Index