• Today

    Aug 2

    75°Lo 61°

    Low clouds, then sunshine

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

    Aug 3

    73°Lo 60°

    Clouds, then sun

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

    Aug 4

    73°Lo 58°

    Clouds breaking for sun

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

    Aug 5

    77°Lo 56°

    Mostly sunny

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

    Aug 6

    79°Lo 59°

    Pleasant with clouds and sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
Next Previous
Low clouds 69° Lo 62° RealFeel® 71° / 62°

N

E

S

W

  • Precipitation: 1%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 72%
  • Cloud Cover: 95%
  • Dew Point: 56° F
  • Visibility: 5 mi
7 mph

Temperature History - Aug 4

more Historical Weather Data >
  Today Normal Record 8/4/2014
High 73° N/A N/A 70°
Low 58° N/A N/A 57°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:14 AM with 14:00 of sunlight, then sets at 8:14 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 11:07 PM with 13:11 of moolight, then sets at 12:18 PM

Castro Valley Weather Report

San Francisco: Dry Weather Continues in the Bay Area

August 2, 2015; 5:42 AM ET

The only fly in the ointment in the forecast will be low morning clouds which may cause travel delays at San Francisco International Airport. more >

Tue. Dust & Dander

Tue. Wind Maps