• Today

    Jul 23

    76°Lo 59°

    Some clouds, then sunshine

    Poor for home energy
    • Avg
      RealFeel
      68°
    • Hi
      RealFeel
      78°
    • Wind
      Speed
      8 mph
    more
  • Thu

    Jul 24

    83°Lo 59°

    A full day of sunshine

    Poor for home energy
    • Avg
      RealFeel
      72°
    • Hi
      RealFeel
      86°
    • Wind
      Speed
      7 mph
    more
  • Fri

    Jul 25

    88°Lo 61°

    A full day of sunshine

    Poor for home energy
    • Avg
      RealFeel
      75°
    • Hi
      RealFeel
      90°
    • Wind
      Speed
      6 mph
  • Sat

    Jul 26

    83°Lo 60°

    Partly sunny

    Poor for home energy
    • Avg
      RealFeel
      72°
    • Hi
      RealFeel
      87°
    • Wind
      Speed
      6 mph
    more
  • Sun

    Jul 27

    82°Lo 60°

    Partly sunny

    Poor for home energy
    • Avg
      RealFeel
      71°
    • Hi
      RealFeel
      85°
    • Wind
      Speed
      7 mph
    more
Next Previous
Hi 88° RealFeel® 90° Precipitation 0%

Day

N

E

S

W

  • WNW 6 mph
  • Gusts: 12 mph

A full day of sunshine

  • Max UV Index: 9 (Very High)
  • 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 61° RealFeel® 59° Precipitation 0%

Night

N

E

S

W

  • WSW 4 mph
  • Gusts: 8 mph

Clear

  • 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 - Jul 25

more Historical Weather Data >
  Today Normal Record 7/25/2013
High 88° N/A N/A 77°
Low 61° N/A N/A 58°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:06 AM with 14:17 of sunlight, then sets at 8:23 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 5:10 AM with 14:15 of moolight, then sets at 7:25 PM

Top Story

Castro Valley Weather Report

San Francisco: Sunny Skies, No Drought Relief in Sight

July 23, 2014; 10:54 AM ET

With partly sunny skies ahead, the San Francisco area will not be receiving needed drought relief for an extended stretch of time. 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.

Fri. Home Energy Efficiency

Fri. Degree Days

Fri. UV Index