6 - 10 of 90 days | All 90 days
Previous 5 Days Next 5 Days
  • Mon

    Aug 1

    Areas of fog, then sun 80°Lo 58°
  • Tue

    Aug 2

    Mostly sunny and nice 87°Lo 55°
  • Wed

    Aug 3

    Mostly sunny and delightful 79°Lo 56°
  • Thu

    Aug 4

    Sunshine 80°Lo 60°
  • Fri

    Aug 5

    Mostly sunny 74°Lo 59°

Want more Hourly forecasting?

Subscribe to our Premium Membership


Get 15 days of hourly forecasts and daily details, plus the interactive Planner and more all ad-free when you subscribe to our Premium service.

Temperature History - Aug 4

more Historical Weather Data >
  Today Normal Record 8/4/2015
High 80° 78° N/A 69°
Low 60° 57° N/A 59°


Sunrise / Sunset Illustration

Rises at 6:15 AM with 13:58 of sunlight, then sets at 8:13 PM


Astronomy >
Moonrise / Moonset Illustration

Rises at 8:08 AM with 13:16 of moolight, then sets at 9:24 PM

Castro Valley Weather Report

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

July 27, 2016; 10:34 PM ET

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

ABC 7 San Francisco Headlines

What Bill Clinton revealed about Hillary in his DNC speech

"In the spring of 1971, I met a girl," Bill Clinton said at the top of his speech at the DNC in Philadelphia, where he told the story of how he met then-Hillary Rodham in college, and his plight to convince her to marry him.

Clinton steps into history as 1st woman White House nominee

WATCH: Bernie Sanders gets emotional as brother casts vote at DNC