, °F

Personalized Forecasts

Featured Forecast

My Favorite Forecasts

    My Recent Locations

    • Today

      Jan 23

      53° /42°F
      A couple of thunderstorms
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
    • Tue

      Jan 24

      55° /38°
      Clouds giving way to some sun
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Wed

      Jan 25

      56° /43°
      Sun and some clouds
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Thu

      Jan 26

      55° /37°
      Chance of a p.m. shower
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Fri

      Jan 27

      58° /37°
      Plenty of sunshine
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More

    Day

    53°Hi RealFeel® 51° Precipitation 75%
    Mostly cloudy with a couple of showers and a thunderstorm
    • SW 7 mph
    • Gusts: 12 mph
    • Max UV Index: 2 (Low)
    • Thunderstorms: 40%
    • Precipitation: 0.1 in
    • Rain: 0.1 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 3 hrs
    • Hours of Rain: 3 hrs

    Night

    42°Lo RealFeel® 36° Precipitation 69%
    Mostly cloudy with a couple of showers
    • SSE 6 mph
    • Gusts: 9 mph
    • Max UV Index: N/A
    • Thunderstorms: 29%
    • Precipitation: 0.22 in
    • Rain: 0.22 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 4 hrs
    • Hours of Rain: 4 hrs

    Castro Valley Pollen Levels Jan 23

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

      Low

    • Ragweed Pollen

      Low

    • Mold

      Low

    • Grass Pollen

      Low

    Temperature History

    more Historical Weather Data >
      Today Normal Record 1/23/2016
    High 53° 58° N/A 57°
    Low 42° 43° N/A 51°

    Sunrise/Sunset

    • Sunrise: 7:19 AM
    • Sunset: 5:22 PM
    • Duration: 10:03 hr

    Moonrise/Moonset

    • Moonrise: 3:39 AM
    • Moonset: 2:04 PM
    • Duration: 10:25 hr
    Astronomy

    Mon. Pollen

    Mon. Dust & Dander

    Mon. Wind Maps