• Today

    May 24

    70°Lo 57°

    Low clouds, then sun and cool

    Beneficial weather for migraines
    • Hi
      RealFeel
      74°
    • UV
      8 - Very High
    • Cloud
      Cover
      46%
    more
  • Mon

    May 25

    67°Lo 57°

    Low clouds, then sunshine

    Beneficial weather for migraines
    • Hi
      RealFeel
      71°
    • UV
      8 - Very High
    • Cloud
      Cover
      59%
    more
  • Tue

    May 26

    69°Lo 58°

    Periods of sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      76°
    • UV
      8 - Very High
    • Cloud
      Cover
      46%
    more
  • Wed

    May 27

    74°Lo 60°

    Sunny and pleasant

    Beneficial weather for migraines
    • Hi
      RealFeel
      80°
    • UV
      9 - Very High
    • Cloud
      Cover
      4%
  • Thu

    May 28

    79°Lo 60°

    Mostly sunny and pleasant

    Beneficial weather for migraines
    • Hi
      RealFeel
      84°
    • UV
      9 - Very High
    • Cloud
      Cover
      15%
    more
Next Previous
Hi 74° RealFeel® 80° Precipitation 0%

Day

N

E

S

W

  • WSW 10 mph
  • Gusts: 17 mph

Sunny and pleasant

  • Max UV Index: 9 (Very High)
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 60° RealFeel® 56° Precipitation 0%

Night

N

E

S

W

  • WSW 7 mph
  • Gusts: 15 mph

Clear

  • Max UV Index: N/A
  • Thunderstorms: 0%
  • 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 27

more Historical Weather Data >
  Today Normal Record 5/27/2014
High 74° N/A N/A 69°
Low 60° N/A N/A 51°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:51 AM with 14:30 of sunlight, then sets at 8:21 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 2:50 PM with 12:09 of moolight, then sets at 2:59 AM

Castro Valley Weather Report

San Francisco: Cool, Cloudy Weather to Linger for Holiday Weekend

May 24, 2015; 3:47 AM ET

More clouds and cooler weather can be expected across the Bay Area through the holiday weekend and into the new week. more >

Wed. Migraine Headache

Wed. UV Index