• Tonight

    May 29

    Lo 54°

    Turning cloudy

    Ragweed Pollen Weather
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
    more
  • Sat

    May 30

    69°Lo 53°

    Clouds breaking for sun

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

    May 31

    70°Lo 57°

    Low clouds, then some sun

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
    more
  • Mon

    Jun 1

    70°Lo 58°

    Some morning sun, then cloudy

    Low ragweed pollen levels
    • Precip
      13%
    • Wind
      Speed
      12 mph
    • Cloud
      Cover
      70%
    more
  • Tue

    Jun 2

    69°Lo 54°

    Mostly sunny and cool

    Ragweed Pollen Weather
    • Precip
      2%
    • Wind
      Speed
      13 mph
    • Cloud
      Cover
      20%
    more
Next Previous
Hi 69° RealFeel® 75° Precipitation 8%

Day

N

E

S

W

  • WNW 9 mph
  • Gusts: 15 mph

Low clouds followed by sunshine

  • Max UV Index: 8 (Very High)
  • Thunderstorms: 6%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 53° RealFeel® 52° Precipitation 1%

Night

N

E

S

W

  • NW 6 mph
  • Gusts: 12 mph

Mainly clear in the evening followed by late-night low clouds

  • Max UV Index: N/A
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Castro Valley Pollen Levels - May 30

  • Extreme
  • Very High
  • High
  • Moderate
  • Low
  • Grass

    Pollen

    Low

  • Weed

    Pollen

    Low

  • Tree

    Pollen

    Moderate

  • Mold

    Pollen

    Low

Temperature History - May 30

more Historical Weather Data >
  Today Normal Record 5/30/2014
High 69° N/A N/A 62°
Low 53° N/A N/A 49°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:49 AM with 14:34 of sunlight, then sets at 8:23 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 5:38 PM with 11:01 of moolight, then sets at 4:39 AM

Castro Valley Weather Report

San Francisco: Dry Weather to Remain Into Early Next Week

May 29, 2015; 2:47 PM ET

The San Francisco area will continue in a dry pattern into early next week. more >

Sat. Pollen

Sat. Dust & Dander

Sat. Wind Maps