• Today

    May 29

    66°Lo 54°

    Clouds, then sun

    Beneficial weather for asthma
    • Hi
      RealFeel
      72°
    • UV
      8 - Very High
    • Air Qual.
      Good
  • Sat

    May 30

    70°Lo 55°

    Clouds breaking for sun

    Beneficial weather for asthma
    • Hi
      RealFeel
      76°
    • UV
      8 - Very High
    • Air Qual.
      Good
    more
  • Sun

    May 31

    68°Lo 57°

    Low clouds, then some sun

    Beneficial weather for asthma
    • Hi
      RealFeel
      71°
    • UV
      8 - Very High
    • Air Qual.
      Good
    more
  • Mon

    Jun 1

    71°Lo 57°

    Some morning sun, then cloudy

    Beneficial weather for asthma
    • Hi
      RealFeel
      73°
    • UV
      8 - Very High
    • Cloud
      Cover
      70%
    more
  • Tue

    Jun 2

    68°Lo 54°

    Mostly sunny and cool

    Beneficial weather for asthma
    • Hi
      RealFeel
      71°
    • UV
      9 - Very High
    • Cloud
      Cover
      20%
    more
Next Previous
Hi 66° RealFeel® 72° Precipitation 1%

Day

N

E

S

W

  • WNW 9 mph
  • Gusts: 15 mph

Low clouds followed by sunshine

  • Max UV Index: 8 (Very High)
  • Thunderstorms: 6%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 54° RealFeel® 51° Precipitation 3%

Night

N

E

S

W

  • NW 7 mph
  • Gusts: 13 mph

Mainly clear this evening followed by low clouds

  • Max UV Index: N/A
  • Thunderstorms: 1%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - May 29

more Historical Weather Data >
  Today Normal Record 5/29/2014
High 66° N/A N/A 78°
Low 54° N/A N/A 50°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:50 AM with 14:32 of sunlight, then sets at 8:22 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:41 PM with 11:22 of moolight, then sets at 4:03 AM

Castro Valley Weather Report

San Francisco: Dry Weather to Remain Into Early Next Week

May 29, 2015; 11:47 AM ET

The San Francisco area will continue in a dry pattern into early next week. more >

The Dangers of Bus Travel

Dec 10, 2012; 5:00 AM ET While bus transportation is one of the most affordable, it is important to know which motor coach companies rank highest in safety.

Fri. Air Quality

Fri. Asthma Risk

Fri. UV Index