• Today

    Aug 30

    81°Lo 61°

    Sunny

    Excellent for stargazing
    • Cloud
      Cover
      9%
    • Precip
      0%
    • Hours of Precip
      0
    more
  • Sun

    Aug 31

    78°Lo 60°

    Partly sunny

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

    Sep 1

    83°Lo 62°

    Sunshine

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

    Sep 2

    78°Lo 61°

    Nice with plenty of sun

    Poor for stargazing
    • Cloud
      Cover
      67%
    • Precip
      0%
    • Hours of Precip
      0
    more
  • Wed

    Sep 3

    75°Lo 60°

    Clouds, then sun

    Excellent for stargazing
    • Cloud
      Cover
      20%
    • Precip
      1%
    • Hours of Precip
      0
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Mon
9am
10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Mostly Sunny
Mostly Sunny
Sunny
Sunny
Sunny
Sunny
Sunny
Sunny
Temp (°F) 66° 69° 73° 77° 80° 82° 83° 81°
RealFeel® 67° 73° 79° 84° 85° 85° 85° 80°
Humidity 72% 66% 58% 52% 47% 43% 41% 43%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 3 WSW 3 W 3 W 5 W 6 WNW 8 WNW 9 WNW 9 WNW
UV Index 2 4 6 7 7 7 6 4
Cloud Cover 26% 10% 0% 0% 0% 0% 0% 0%
Dew Point 57° 57° 57° 58° 58° 58° 58° 56°
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

Temperature History - Sep 1

more Historical Weather Data >
  Today Normal Record 9/1/2013
High 83° N/A N/A 76°
Low 62° N/A N/A 59°

Solunar Information for Castro Valley, CA

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:38 AM with 13:00 of sunlight, then sets at 7:38 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:22 PM with 10:28 of moolight, then sets at 11:50 PM

Tue, Sep 2
First
Tue, Sep 9
Full
Tue, Sep 16
Last
Wed, Sep 24
New
Top Story

Castro Valley Weather Report

San Francisco: Bright, Sunny for First Week of September

August 30, 2014; 5:14 AM ET

San Francisco will see abundant sunshine through at least Thursday. more >

Curiosity Tastes Mars

Dec 14, 2012; 5:00 AM ET The Mars Science Laboratory Rover 'Curiosity' continues its sampling and analyzing of the Martian surface.

Mon. Stargazing