• Today

    May 2

    74°Lo 53°

    Low clouds, then sun

    Excellent for running
    • Precip
      2%
    • Hours of Precip
      0
    • Wind
      Gust
      14 mph
  • Tue

    May 3

    70°Lo 53°

    Clouds giving way to some sun

    Excellent for running
    • Precip
      10%
    • Hours of Precip
      0
    • Wind
      Gust
      10 mph
    more
  • Wed

    May 4

    67°Lo 54°

    An afternoon shower in spots

    Excellent for running
    • Precip
      43%
    • Hours of Precip
      0.5
    • Wind
      Gust
      17 mph
    more
  • Thu

    May 5

    65°Lo 51°

    Variable clouds, a t-storm

    Very Good for running
    • Precip
      56%
    • Hours of Precip
      2
    • Wind
      Gust
      14 mph
    more
  • Fri

    May 6

    66°Lo 50°

    Clouds and sun with a t-storm

    Good for running
    • Precip
      55%
    • Hours of Precip
      4
    • Wind
      Gust
      15 mph
    more
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  Mon
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  2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm
Forecast
Partly Sunny
Partly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Clear
Temp (°F) 74° 74° 73° 70° 68° 66° 63° 60°
RealFeel® 79° 78° 75° 71° 67° 63° 62° 60°
Humidity 48% 48% 49% 50% 53% 61% 67% 71%
   
  2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm
Rain
 
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Snow
 
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Ice
 
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  2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm
Wind (mph) 10 NW 9 NW 10 NW 10 WNW 9 WNW 8 WNW 6 W 5 W
UV Index 7 6 5 3 1 0 0 0
Cloud Cover 40% 31% 11% 11% 11% 11% 25% 25%
Dew Point 53° 53° 53° 51° 51° 52° 52° 51°
Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F

Temperature History - May 2

more Historical Weather Data >
  Today Normal Record 5/2/2015
High 74° 69° N/A 72°
Low 53° 50° N/A 53°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:11 AM with 13:49 of sunlight, then sets at 8:00 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:37 AM with 11:51 of moolight, then sets at 3:28 PM

Castro Valley Weather Report

San Francisco: Showery weather to arrive by late week

May 2, 2016; 12:34 PM ET

Clouds and showers will move into the Bay Area following a dry start to May. more >

Avoid the Winter Workout Blues

Dec 26, 2012; 5:00 AM ET When it's snowing or cold, most of us want nothing more than to keep warm on the couch. But Violeta Yas has some tips to help you sneak in mini workouts at the office, regardless of the weather.