• Today

    Oct 21

    71°Lo 53°

    Partly sunny

    Poor for home energy
    • Avg
      RealFeel
      61°
    • Hi
      RealFeel
      70°
    • Wind
      Speed
      8 mph
  • Wed

    Oct 22

    71°Lo 57°

    Partly sunny and pleasant

    Poor for home energy
    • Avg
      RealFeel
      63°
    • Hi
      RealFeel
      70°
    • Wind
      Speed
      7 mph
    more
  • Thu

    Oct 23

    73°Lo 59°

    Mostly sunny and pleasant

    Poor for home energy
    • Avg
      RealFeel
      64°
    • Hi
      RealFeel
      72°
    • Wind
      Speed
      6 mph
    more
  • Fri

    Oct 24

    73°Lo 58°

    Sunshine and patchy clouds

    Poor for home energy
    • Avg
      RealFeel
      63°
    • Hi
      RealFeel
      71°
    • Wind
      Speed
      13 mph
    more
  • Sat

    Oct 25

    67°Lo 51°

    Showers around in the morning

    Poor for home energy
    • Avg
      RealFeel
      58°
    • Hi
      RealFeel
      67°
    • Wind
      Speed
      7 mph
    more
Next Previous
Hi 71° RealFeel® 70° Precipitation 4%

Day

N

E

S

W

  • WNW 8 mph
  • Gusts: 15 mph

Partly sunny

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 53° RealFeel® 52° Precipitation 4%

Night

N

E

S

W

  • WNW 4 mph
  • Gusts: 8 mph

Partly cloudy

  • Max UV Index: N/A
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Oct 21

more Historical Weather Data >
  Today Normal Record 10/21/2013
High 71° N/A N/A 71°
Low 53° N/A N/A 48°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:22 AM with 11:01 of sunlight, then sets at 6:23 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 5:14 AM with 12:04 of moolight, then sets at 5:18 PM

Castro Valley Weather Report

San Francisco: Dry Weather to Remain into Late Week

October 21, 2014; 6:40 AM ET

After the Bay Area received a light rainfall to start the week, it will turn dry again on Tuesday and remain unseasonably war. more >

Energy Efficient Lightbulbs and S.A.D

Sep 8, 2012; 5:00 AM ET With shorter days and colder nights in the fall and winter, some people develop seasonal affective disorder. When shopping for lightbulbs to treat the 'winter blues,'consider energy-efficient bulbs.

Tue. Home Energy Efficiency

Tue. Degree Days

Tue. UV Index