• Tonight

    Jul 30

    Lo 56°

    Increasing cloudiness

    Migraine Headache Weather
    • Hi
      RealFeel
      85°
    • UV
      7 - Very High
    • Cloud
      Cover
      34%
    more
  • Sun

    Jul 31

    79°Lo 58°

    Clouds, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      83°
    • UV
      7 - Very High
    • Cloud
      Cover
      48%
    more
  • Mon

    Aug 1

    78°Lo 56°

    Areas of fog, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      82°
    • UV
      7 - Very High
    • Cloud
      Cover
      45%
    more
  • Tue

    Aug 2

    79°Lo 54°

    Mostly sunny and nice

    Beneficial weather for migraines
    • Hi
      RealFeel
      84°
    • UV
      7 - Very High
    • Cloud
      Cover
      22%
    more
  • Wed

    Aug 3

    81°Lo 55°

    Fog to sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      85°
    • UV
      7 - Very High
    • Cloud
      Cover
      47%
Next Previous
Mainly clear 65° Lo 58° RealFeel® 63° / 57°

N

E

S

W

  • Precipitation: 1%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 61%
  • Cloud Cover: 19%
  • Dew Point: 47° F
  • Visibility: 10 mi
7 mph

Temperature History - Aug 3

more Historical Weather Data >
  Today Normal Record 8/3/2015
High 81° 78° N/A 73°
Low 55° 57° N/A 61°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:14 AM with 14:00 of sunlight, then sets at 8:14 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 7:08 AM with 13:40 of moolight, then sets at 8:48 PM

Castro Valley Weather Report

Western US: Diminishing heat to aid in firefighting efforts this week

July 30, 2016; 11:48 PM ET

As several large fires continue to rage across the western United States, weather conditions will gradually improve for firefighting efforts this week. more >

Wed. Migraine Headache

Wed. UV Index