• Early AM

    Apr 27

    Lo 57°

    Clear

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

    Apr 27

    77°Lo 51°

    Warmer with abundant sunshine

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

    Apr 28

    68°Lo 49°

    Sunshine and not as warm

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

    Apr 29

    69°Lo 47°

    Mostly sunny

    Low ragweed pollen levels
    • Precip
      2%
    • Wind
      Speed
      9 mph
    • Cloud
      Cover
      15%
    more
  • Thu

    Apr 30

    79°Lo 54°

    Nice with plenty of sunshine

    Low ragweed pollen levels
    • Precip
      4%
    • Wind
      Speed
      8 mph
    • Cloud
      Cover
      0%
    more
Next Previous
Clear 53° RealFeel® 56°

N

E

S

W

  • Humidity: 85%
  • Pressure: 30.06 in
  • UV Index: 0
  • Cloud Cover: 0%
  • Ceiling: 28300 ft
  • Dew Point: 49° F
  • Visibility: 10 mi
0 mph

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:18 AM with 13:37 of sunlight, then sets at 7:55 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 2:15 PM with 13:12 of moolight, then sets at 3:27 AM

Temperature Summary - 3:55 AM

  Temp (°F)
Now 53°
Yesterday 55°
RealFeel® 56°
RealFeel® Shade 56°
Wind Chill 53°
Dew Point 49°
  Hi / Lo
Previous 6 Hours 58°
  53°
Previous 12 Hours 68°
  53°
Previous 24 Hours 68°
  47°

Temperature History - Apr 27

more Historical Weather Data >
  Today Normal Record 4/27/2014
High 77° N/A N/A 61°
Low 51° N/A N/A 50°

Precipitation Summary - 3:55 AM

  Amount (in)
Previous 1 Hour 0
Previous 3 Hours 0
Previous 6 Hours 0
Previous 9 Hours 0
Previous 12 Hours 0
Previous 18 Hours 0
Previous 24 Hours 0

Castro Valley Weather Report

San Francisco: Dry Pattern to Continue After Weekend Showers

April 27, 2015; 4:27 AM ET

Warm and dry conditions will begin the new week in San Francisco. more >

Mon. Pollen

Mon. Dust & Dander

Mon. Wind Maps