• Today

    May 31

    82°Lo 52°

    Areas of low clouds, then sun

    Good for stargazing
    • Cloud
      Cover
      55%
    • Precip
      2%
    • Hours of Precip
      0
    more
  • Wed

    Jun 1

    81°Lo 52°

    Areas of low clouds, then sun

    Good for stargazing
    • Cloud
      Cover
      57%
    • Precip
      0%
    • Hours of Precip
      0
    more
  • Thu

    Jun 2

    83°Lo 52°

    Partly sunny and very warm

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

    Jun 3

    88°Lo 54°

    Partly sunny and very warm

    Good for stargazing
    • Cloud
      Cover
      50%
    • Precip
      1%
    • Hours of Precip
      0
    more
  • Sat

    Jun 4

    86°Lo 56°

    Very warm with clouds and sun

    Poor for stargazing
    • Cloud
      Cover
      78%
    • Precip
      6%
    • Hours of Precip
      0
    more
Next Previous
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Forecast
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 64° 68° 73° 76° 78° 80° 81° 83°
RealFeel® 70° 74° 80° 82° 83° 85° 85° 85°
Humidity 70% 60% 54% 50% 44% 41% 42% 40%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
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Snow
 
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  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 5 WSW 5 WSW 5 W 7 W 8 W 9 W 9 W 10 W
UV Index 3 4 6 7 7 8 7 5
Cloud Cover 76% 76% 76% 76% 76% 26% 26% 26%
Dew Point 54° 54° 55° 56° 54° 54° 56° 57°
Middle Grid line 85 F Middle Grid line 80 F Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F

Temperature History - Jun 2

more Historical Weather Data >
  Today Normal Record 6/2/2015
High 83° 74° N/A 64°
Low 52° 53° N/A 55°

Solunar Information for Castro Valley, CA

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:48 AM with 14:38 of sunlight, then sets at 8:26 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:10 AM with 13:38 of moolight, then sets at 5:48 PM

Sun, Jun 5
New
Sun, Jun 12
First
Mon, Jun 20
Full
Mon, Jun 27
Last

Castro Valley Weather Report

San Francisco: Warm, dry weather to kick off June

May 31, 2016; 5:31 AM ET

The first part of June will be dry and warm in the Bay Area after some cooler-than-normal weather during the second half of May. 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.

Thu. Stargazing