• Today

    Oct 20

    69°Lo 52°

    A little afternoon rain

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Tue

    Oct 21

    70°Lo 52°

    Partly sunny

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Wed

    Oct 22

    71°Lo 55°

    Mostly sunny and pleasant

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      7 - Low
  • Thu

    Oct 23

    73°Lo 57°

    Mostly sunny and pleasant

    Low ragweed pollen levels
    • Precip
      25%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      18%
    more
  • Fri

    Oct 24

    72°Lo 56°

    Mostly sunny

    Ragweed Pollen Weather
    • Precip
      25%
    • Wind
      Speed
      12 mph
    • Cloud
      Cover
      11%
    more
Next Previous
Sunny to partly cloudy 66° Lo 56° RealFeel® 69° / 55°

N

E

S

W

  • Precipitation: 4%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 71%
  • Cloud Cover: 25%
  • Dew Point: 52° F
  • Visibility: 10 mi
4 mph

Temperature History - Oct 22

more Historical Weather Data >
  Today Normal Record 10/22/2013
High 71° N/A N/A 71°
Low 55° N/A N/A 47°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:23 AM with 10:59 of sunlight, then sets at 6:22 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 6:11 AM with 11:39 of moolight, then sets at 5:50 PM

Castro Valley Weather Report

Rain to Arrive in San Francisco Early This Week

October 20, 2014; 7:48 AM ET

A chance of rain is expected on Monday as a Pacific storm moves through the Northwest United States. more >

Wed. Dust & Dander

Wed. Wind Maps