• Today

    Jul 27

    88°Lo 58°

    Clouds breaking for sun; warm

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • Thu

    Jul 28

    84°Lo 58°

    Mostly sunny and very warm

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • Fri

    Jul 29

    85°Lo 59°

    Remaining warm with sunshine

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
  • Sat

    Jul 30

    83°Lo 58°

    Mostly sunny

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • Sun

    Jul 31

    80°Lo 58°

    Clouds, then sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
Next Previous
Mainly clear 74° Lo 64° RealFeel® 71° / 63°

N

E

S

W

  • Precipitation: 1%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 69%
  • Cloud Cover: 9%
  • Dew Point: 58° F
  • Visibility: 10 mi
7 mph

Temperature History - Jul 29

more Historical Weather Data >
  Today Normal Record 7/29/2015
High 85° 78° N/A 91°
Low 59° 57° N/A 63°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:10 AM with 14:09 of sunlight, then sets at 8:19 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 2:17 AM with 14:22 of moolight, then sets at 4:39 PM

Castro Valley Weather Report

Oppressive heat to envelop the western US as weekend highs soar 10 to 15 degrees Fahrenheit above average

July 27, 2016; 3:46 AM ET

Highs will run between 10 and 15 degrees Fahrenheit above average across much of the western United States into the upcoming weekend. more >

Fri. Dust & Dander

Fri. Wind Maps