• Today

    Jul 28

    85°Lo 57°

    Mostly sunny and very warm

    Beneficial weather for migraines
    • Hi
      RealFeel
      89°
    • UV
      7 - Very High
    • Cloud
      Cover
      19%
    more
  • Fri

    Jul 29

    85°Lo 58°

    Clouds, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      89°
    • UV
      7 - Very High
    • Cloud
      Cover
      44%
    more
  • Sat

    Jul 30

    83°Lo 58°

    Mostly sunny

    Beneficial weather for migraines
    • Hi
      RealFeel
      86°
    • UV
      7 - Very High
    • Cloud
      Cover
      20%
    more
  • Sun

    Jul 31

    80°Lo 58°

    Clouds, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      83°
    • UV
      7 - Very High
    • Cloud
      Cover
      47%
  • Mon

    Aug 1

    79°Lo 57°

    Areas of fog, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      82°
    • UV
      7 - Very High
    • Cloud
      Cover
      47%
    more
Next Previous
Mainly clear 70° Lo 63° RealFeel® 67° / 63°

N

E

S

W

  • Precipitation: 1%
  • Rain: 0 in
  • Snow: 0 in
  • Humidity: 72%
  • Cloud Cover: 21%
  • Dew Point: 57° F
  • Visibility: 10 mi
6 mph

Temperature History - Jul 31

more Historical Weather Data >
  Today Normal Record 7/31/2015
High 80° 78° N/A 75°
Low 58° 57° N/A 60°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:12 AM with 14:05 of sunlight, then sets at 8:17 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:05 AM with 14:30 of moolight, then sets at 6:35 PM

Castro Valley Weather Report

Oppressive heat to envelop western US as late-week highs soar 10 to 15 degrees Fahrenheit above average

July 28, 2016; 7:34 AM ET

Highs will run between 10 and 15 degrees Fahrenheit above average across much of the interior western United States into the upcoming weekend. more >

Sun. Migraine Headache

Sun. UV Index