• Today

    May 26

    71°Lo 51°

    Clouds giving way to sun

    Good for stargazing
    • Cloud
      Cover
      25%
    • Precip
      2%
    • Hours of Precip
      0
    more
  • Fri

    May 27

    79°Lo 52°

    Areas of low clouds, then sun

    Excellent for stargazing
    • Cloud
      Cover
      9%
    • Precip
      1%
    • Hours of Precip
      0
  • Sat

    May 28

    81°Lo 51°

    Mostly sunny

    Excellent for stargazing
    • Cloud
      Cover
      1%
    • Precip
      0%
    • Hours of Precip
      0
    more
  • Sun

    May 29

    80°Lo 53°

    Mostly sunny

    Excellent for stargazing
    • Cloud
      Cover
      1%
    • Precip
      0%
    • Hours of Precip
      0
    more
  • Mon

    May 30

    81°Lo 53°

    Very warm with sunshine

    Excellent for stargazing
    • Cloud
      Cover
      59%
    • Precip
      1%
    • Hours of Precip
      0
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Fri
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  5am 6am 7am 8am 9am 10am 11am 12pm
Forecast
Mostly Clear
Mostly Sunny
Mostly Sunny
Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Temp (°F) 54° 51° 55° 58° 62° 65° 69° 73°
RealFeel® 53° 52° 57° 61° 68° 72° 78° 81°
Humidity 88% 95% 82% 79% 71% 60% 56% 54%
   
  5am 6am 7am 8am 9am 10am 11am 12pm
Rain
 
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Snow
 
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Ice
 
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  5am 6am 7am 8am 9am 10am 11am 12pm
Wind (mph) 5 SW 4 SW 4 SW 2 WSW 4 NW 4 NW 5 NW 6 NW
UV Index 0 0 0 1 2 4 6 7
Cloud Cover 25% 25% 25% 90% 76% 76% 76% 76%
Dew Point 50° 50° 50° 52° 53° 51° 53° 55°
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 Middle Grid line 50 F

Temperature History - May 27

more Historical Weather Data >
  Today Normal Record 5/27/2015
High 79° 73° N/A 63°
Low 52° 52° N/A 51°

Solunar Information for Castro Valley, CA

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:50 AM with 14:31 of sunlight, then sets at 8:21 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 12:18 AM with 10:50 of moolight, then sets at 11:08 AM

Sun, May 29
Last
Sun, Jun 5
New
Sun, Jun 12
First
Mon, Jun 20
Full

Castro Valley Weather Report

San Francisco: Milder air to build ahead of Memorial Day weekend

May 26, 2016; 10:58 AM ET

Following a stretch of cool days, milder air will begin to build across the Bay area heading into Memorial Day weekend. more >

'Frankenfish' Ready for Market

Dec 7, 2012; 7:08 AM ET A new lab-created meat is waiting for FDA approval that is at once very different and just the same as your favorite fish dinner.

Fri. Stargazing