• Sunny 60°
    Ragweed Pollen Current Weather
    • Relative Humidity
      59%
    • Yesterday
      Temp
      62°
    • RealFeel
      68°
  • Today

    Feb 9

    Hi 71°

    Partly sunny

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    Day Details >
  • Tomorrow

    Feb 10

    Hi 68°

    Partly sunny

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    Day Details >
  • Thursday

    Feb 11

    Hi 69°

    Periods of clouds and sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    Day Details >
Next

Cool Saturday night

2/9 2/10 Now: 10:13am
AM 10-2
  • 10am Mostly sunny 61° 0%
  • 11am Mostly sunny 64° 0%
  • 12pm Mostly sunny 67° 0%
  • 1pm Mostly sunny 70° 0%
  • 2pm Mostly sunny 71° 0%
PM 9-2
  • 9pm Mostly clear 56° 0%
  • 10pm Mostly clear 54° 0%
  • 11pm Mostly clear 53° 0%
  • 12am Mostly clear 53° 0%
  • 1am Mostly clear 53° 0%
  • 2am Mostly clear 52° 0%
AM 3-8
  • 3am Mostly clear 52° 0%
  • 4am Mostly clear 51° 0%
  • 5am Mostly clear 50° 0%
  • 6am Mostly clear 48° 0%
  • 7am Mostly clear 47° 0%
  • 8am Mostly sunny 50° 0%
Hourly Forecast >

Castro Valley Pollen Levels - February 9

  • Extreme
  • Very High
  • High
  • Moderate
  • Low
  • Tree Pollen

    Low

  • Ragweed Pollen

    Low

  • Mold Pollen

    Low

  • Grass Pollen

    Low

Feb 09, 2016; 5:22 AM ET
Five-day Weather Forecast for San Francisco, CA
San Francisco, CA Weather Forecast

Castro Valley Weather Report

Warmth to challenge records from Seattle to Los Angeles early this week

February 9, 2016; 4:54 AM ET

Warmer air will build from California to Washington into Tuesday raising temperatures to near-record levels and increasing the risk of wildfires in some areas. more >

Allergies Live Feed

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Tue. Pollen

Tue. Dust & Dander

Tue. Wind Maps