• Tonight

    Feb 28

    Lo 44°

    An evening thunderstorm

    Home Energy Efficiency Weather
    • Avg
      RealFeel
      54°
    • Hi
      RealFeel
      64°
    • Wind
      Speed
      6 mph
  • Sun

    Mar 1

    63°Lo 44°

    Partly sunny

    Poor for home energy
    • Avg
      RealFeel
      54°
    • Hi
      RealFeel
      66°
    • Wind
      Speed
      6 mph
    more
  • Mon

    Mar 2

    61°Lo 42°

    A passing shower or two

    Poor for home energy
    • Avg
      RealFeel
      55°
    • Hi
      RealFeel
      67°
    • Wind
      Speed
      6 mph
    more
  • Tue

    Mar 3

    63°Lo 41°

    Plenty of sunshine

    Poor for home energy
    • Avg
      RealFeel
      54°
    • Hi
      RealFeel
      66°
    • Wind
      Speed
      7 mph
    more
  • Wed

    Mar 4

    66°Lo 41°

    Plenty of sun

    Poor for home energy
    • Avg
      RealFeel
      57°
    • Hi
      RealFeel
      72°
    • Wind
      Speed
      5 mph
    more
Next Previous
Hi 59° RealFeel® 64° Precipitation 55%

Day

N

E

S

W

  • WNW 6 mph
  • Gusts: 13 mph

Variable cloudiness with a shower or thunderstorm in spots this afternoon

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 40%
  • Precipitation: 0.15 in
  • Rain: 0.15 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 1.5 hrs
  • Hours of Rain: 1.5 hrs
Lo 44° RealFeel® 44° Precipitation 55%

Night

N

E

S

W

  • ENE 4 mph
  • Gusts: 7 mph

An evening shower or thunderstorm around; otherwise, partly cloudy and chilly

  • Max UV Index: N/A
  • Thunderstorms: 40%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs

Temperature History - Feb 28

more Historical Weather Data >
  Today Normal Record 2/28/2014
High 59° N/A N/A 61°
Low 44° N/A N/A 53°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:41 AM with 11:20 of sunlight, then sets at 6:01 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:51 PM with 14:14 of moolight, then sets at 4:05 AM

Castro Valley Weather Report

Western Storm to Deliver Fraction of Much-Needed Rain, Snow

February 28, 2015; 10:07 PM ET

A slow-moving storm will continue to affect the West this weekend and into the first part of next week with rounds of precipitation for some needy areas as well as trouble for travelers. 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.

Sat. Home Energy Efficiency

Sat. Degree Days

Sat. UV Index