• Today

    Sep 4

    73°Lo 53°

    Mostly sunny

    Very Good for an outdoor bbq
    • Precip
      2%
    • Hi
      RealFeel
      74°
    • Wind
      Speed
      13 mph
  • Sat

    Sep 5

    80°Lo 54°

    Mostly sunny

    Excellent for an outdoor bbq
    • Precip
      3%
    • Hi
      RealFeel
      83°
    • Wind
      Speed
      8 mph
    more
  • Sun

    Sep 6

    85°Lo 55°

    Plenty of sun

    Excellent for an outdoor bbq
    • Precip
      1%
    • Hi
      RealFeel
      88°
    • Wind
      Speed
      7 mph
    more
  • Mon

    Sep 7

    87°Lo 56°

    Plenty of sunshine

    Excellent for an outdoor bbq
    • Precip
      1%
    • Hi
      RealFeel
      89°
    • Wind
      Speed
      7 mph
    more
  • Tue

    Sep 8

    86°Lo 55°

    Areas of low clouds, then sun

    Excellent for an outdoor bbq
    • Precip
      1%
    • Hi
      RealFeel
      88°
    • Wind
      Speed
      8 mph
    more
Next Previous
Mostly sunny 71° Lo 57° RealFeel® 74° / 55°

N

E

S

W

  • Precipitation: 0%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 70%
  • Cloud Cover: 19%
  • Dew Point: 53° F
  • Visibility: 9 mi
10 mph

Temperature History - Sep 4

more Historical Weather Data >
  Today Normal Record 9/4/2014
High 73° N/A N/A 74°
Low 53° N/A N/A 57°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:41 AM with 12:52 of sunlight, then sets at 7:33 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 11:58 PM with 14:22 of moolight, then sets at 2:20 PM

Castro Valley Weather Report

San Francisco: Pleasant Stretch Continues Through Labor Day

September 4, 2015; 10:12 AM ET

As a ridge moves in from the west over the weekend and early next week, high temperatures will swing back above normal. 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.

Fri. Outdoor Entertaining

Fri. Wind Maps

Fri. UV Index