• Today

    Jul 30

    82°Lo 58°

    Sunny to partly cloudy

    Poor for home energy
    • Avg
      RealFeel
      72°
    • Hi
      RealFeel
      86°
    • Wind
      Speed
      8 mph
  • Sun

    Jul 31

    79°Lo 58°

    Clouds, then sun

    Poor for home energy
    • Avg
      RealFeel
      70°
    • Hi
      RealFeel
      83°
    • Wind
      Speed
      8 mph
    more
  • Mon

    Aug 1

    79°Lo 56°

    Areas of fog, then sun

    Poor for home energy
    • Avg
      RealFeel
      70°
    • Hi
      RealFeel
      83°
    • Wind
      Speed
      9 mph
    more
  • Tue

    Aug 2

    79°Lo 54°

    Mostly sunny and nice

    Poor for home energy
    • Avg
      RealFeel
      69°
    • Hi
      RealFeel
      83°
    • Wind
      Speed
      7 mph
    more
  • Wed

    Aug 3

    78°Lo 56°

    Fog to sun

    Poor for home energy
    • Avg
      RealFeel
      68°
    • Hi
      RealFeel
      82°
    • Wind
      Speed
      7 mph
    more
Next Previous
Hi 82° RealFeel® 86° Precipitation 1%

Day

N

E

S

W

  • W 8 mph
  • Gusts: 15 mph

Sunny to partly cloudy

  • Max UV Index: 9 (Very High)
  • Thunderstorms: 1%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 58° RealFeel® 57° Precipitation 2%

Night

N

E

S

W

  • WSW 6 mph
  • Gusts: 13 mph

Mainly clear early on, then areas of low clouds and fog

  • Max UV Index: N/A
  • Thunderstorms: 3%
  • 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 30

more Historical Weather Data >
  Today Normal Record 7/30/2015
High 82° 78° N/A 79°
Low 58° 57° N/A 59°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:11 AM with 14:07 of sunlight, then sets at 8:18 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:09 AM with 14:31 of moolight, then sets at 5:40 PM

Castro Valley Weather Report

Western US: Diminishing heat to aid in firefighting efforts this week

July 30, 2016; 10:08 AM ET

As several large fires continue to rage across the western United States, weather conditions will gradually improve for firefighting efforts in the upcoming week. more >

Sat. Home Energy Efficiency

Sat. Degree Days

Sat. UV Index