• Early AM

    Oct 31

    Lo 59°

    Mostly cloudy

    Ragweed Pollen Weather
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Today

    Oct 31

    65°Lo 52°

    Breezy and cooler with rain

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Sat

    Nov 1

    64°Lo 47°

    Clouds and sun with a shower

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      0 - Low
  • Sun

    Nov 2

    67°Lo 46°

    Mostly sunny

    Low ragweed pollen levels
    • Precip
      2%
    • Wind
      Speed
      7 mph
    • Cloud
      Cover
      11%
    more
  • Mon

    Nov 3

    68°Lo 49°

    Sunshine and patchy clouds

    Low ragweed pollen levels
    • Precip
      3%
    • Wind
      Speed
      5 mph
    • Cloud
      Cover
      25%
    more
Next Previous
Clear 53° Lo 47° RealFeel® 51° / 45°

N

E

S

W

  • Precipitation: 4%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 86%
  • Cloud Cover: 0%
  • Dew Point: 45° F
  • Visibility: 10 mi
5 mph

Temperature History - Nov 1

more Historical Weather Data >
  Today Normal Record 11/1/2013
High 64° N/A N/A 72°
Low 47° N/A N/A 47°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:33 AM with 10:37 of sunlight, then sets at 6:10 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:01 PM with 11:48 of moolight, then sets at 2:49 AM

Castro Valley Weather Report

San Francisco: Showers to Dampen Halloween Weekend

October 31, 2014; 5:03 AM ET

Showers are expected to fall over the Bay Area over the Halloween weekend, potentially dampening some holiday plans. more >

Sat. Pollen

Sat. Dust & Dander

Sat. Wind Maps