• 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
  • Thu

    Jul 28

    86°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°

    Clouds, then sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • 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 57°

    Clouds, then sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
Next Previous
Mostly sunny 88° Lo 77° RealFeel® 92° / 75°

N

E

S

W

  • Precipitation: 0%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 38%
  • Cloud Cover: 11%
  • Dew Point: 56° F
  • Visibility: 5 mi
10 mph

Temperature History - Jul 27

more Historical Weather Data >
  Today Normal Record 7/27/2015
High 88° 77° N/A 84°
Low 58° 57° N/A 54°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:09 AM with 14:12 of sunlight, then sets at 8:21 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 12:48 AM with 13:41 of moolight, then sets at 2:29 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 >

Wed. Pollen

Wed. Dust & Dander

Wed. Wind Maps