• Early AM

    May 4

    Lo 50°

    Cloudy

    Stargazing Weather
    • Cloud
      Cover
      86%
    • Precip
      1%
    • Hours of Precip
      0
    more
  • Today

    May 4

    63°Lo 49°

    Areas of low clouds, then sun

    Fair for stargazing
    • Cloud
      Cover
      25%
    • Precip
      3%
    • Hours of Precip
      0
    more
  • Tue

    May 5

    64°Lo 48°

    Sunshine and patchy clouds

    Good for stargazing
    • Cloud
      Cover
      25%
    • Precip
      3%
    • Hours of Precip
      0
  • Wed

    May 6

    65°Lo 48°

    Sunshine; breezy in the p.m.

    Very Good for stargazing
    • Cloud
      Cover
      1%
    • Precip
      10%
    • Hours of Precip
      0
    more
  • Thu

    May 7

    68°Lo 49°

    Sunshine; breezy in the p.m.

    Poor for stargazing
    • Cloud
      Cover
      70%
    • Precip
      5%
    • Hours of Precip
      0
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Tue
7am
8am 9am 10am 11am 12pm 1pm 2pm
  7am 8am 9am 10am 11am 12pm 1pm 2pm
Forecast
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 50° 51° 54° 55° 57° 59° 61° 63°
RealFeel® 45° 49° 53° 57° 61° 63° 65° 65°
Humidity 86% 83% 77% 72% 67% 63% 59% 55%
   
  7am 8am 9am 10am 11am 12pm 1pm 2pm
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%
   
  7am 8am 9am 10am 11am 12pm 1pm 2pm
Wind (mph) 9 WSW 9 WSW 9 WSW 9 WSW 10 WSW 12 WSW 13 W 15 W
UV Index 0 1 3 4 6 7 8 8
Cloud Cover 25% 25% 25% 25% 25% 25% 25% 25%
Dew Point 46° 46° 47° 46° 47° 47° 47° 47°
Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F Middle Grid line 45 F

Temperature History - May 5

more Historical Weather Data >
  Today Normal Record 5/5/2014
High 64° N/A N/A 62°
Low 48° N/A N/A 53°

Solunar Information for Castro Valley, CA

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:08 AM with 13:54 of sunlight, then sets at 8:02 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 9:44 PM with 10:26 of moolight, then sets at 8:10 AM

Mon, May 4
Full
Mon, May 11
Last
Mon, May 18
New
Mon, May 25
First

Castro Valley Weather Report

San Francisco: Seasonable Temperatures to Continue Through Week

May 4, 2015; 2:12 AM 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 >

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.

Tue. Stargazing