• Mon

    May 18

    61°Lo 48°

    Times of clouds and sun

    Migraine Headache Weather
    • Hi
      RealFeel
      65°
    • UV
      8 - Very High
    • Cloud
      Cover
      55%
  • Tue

    May 19

    79°Lo 54°

    Sunny

    Migraine Headache Weather
    • Hi
      RealFeel
      83°
    • UV
      9 - Very High
    • Cloud
      Cover
      11%
    more
  • Wed

    May 20

    75°Lo 54°

    Sunny

    Migraine Headache Weather
    • Hi
      RealFeel
      80°
    • UV
      9 - Very High
    • Cloud
      Cover
      0%
    more
  • Thu

    May 21

    75°Lo 54°

    Sunshine

    Migraine Headache Weather
    • Hi
      RealFeel
      84°
    • UV
      9 - Very High
    • Cloud
      Cover
      1%
    more
  • Fri

    May 22

    74°Lo 53°

    A blend of sun and clouds

    Migraine Headache Weather
    • Hi
      RealFeel
      76°
    • UV
      5 - Moderate
    • Cloud
      Cover
      58%
    more
Next Previous
Hi 61° RealFeel® 65° Precipitation 20%

Day

N

E

S

W

  • S 9 mph
  • Gusts: 23 mph

Times of clouds and sun

  • Max UV Index: 8 (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 48° RealFeel® 43° Precipitation 5%

Night

N

E

S

W

  • S 7 mph
  • Gusts: 22 mph

Partly cloudy

  • 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 18

more Historical Weather Data >
  Today Normal Record 5/18/2014
High 61° N/A N/A 64°
Low 48° N/A N/A 50°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:56 AM with 14:18 of sunlight, then sets at 8:14 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 6:37 AM with 14:21 of moolight, then sets at 8:58 PM

Castro Valley Weather Report

San Francisco: Seasonable Temperatures to Continue Through Week

May 3, 2015; 12:29 PM ET

A pattern of seasonable temperatures will continue through the first part of the new week, with low clouds in the morning and sunny conditions through the afternoon. more >