• Tonight

    Oct 25

    Lo 53°

    Spotty showers this evening

    Bicycling Weather
    • Precip
      62%
    • Hours of Precip
      2.5
    • Wind
      Gust
      22 mph
    more
  • Sun

    Oct 26

    69°Lo 50°

    Times of clouds and sun

    Excellent for biking
    • Precip
      6%
    • Hours of Precip
      0
    • Wind
      Gust
      16 mph
  • Mon

    Oct 27

    69°Lo 50°

    Partly sunny

    Excellent for biking
    • Precip
      3%
    • Hours of Precip
      0
    • Wind
      Gust
      12 mph
    more
  • Tue

    Oct 28

    72°Lo 52°

    Partly sunny

    Excellent for biking
    • Precip
      3%
    • Hours of Precip
      0
    • Wind
      Gust
      9 mph
    more
  • Wed

    Oct 29

    76°Lo 54°

    Sunny and pleasant

    Excellent for biking
    • Precip
      5%
    • Hours of Precip
      0
    • Wind
      Gust
      7 mph
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sun
9am
10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Temp (°F) 56° 58° 61° 64° 65° 66° 68° 69°
RealFeel® 54° 57° 61° 64° 65° 66° 66° 66°
Humidity 82% 72% 64% 58% 53% 49% 47% 46%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
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0%
 
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0%
 
0%
 
0%
Snow
 
0%
 
0%
 
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Ice
 
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  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 6 NNW 7 NW 8 NW 9 NW 10 NW 12 NW 12 NW 13 WNW
UV Index 1 1 2 3 4 3 2 1
Cloud Cover 46% 46% 46% 46% 46% 46% 46% 46%
Dew Point 51° 50° 49° 49° 47° 47° 47° 48°
Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F

Temperature History - Oct 26

more Historical Weather Data >
  Today Normal Record 10/26/2013
High 69° N/A N/A 73°
Low 50° N/A N/A 48°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:27 AM with 10:50 of sunlight, then sets at 6:17 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 10:09 AM with 10:26 of moolight, then sets at 8:35 PM

Castro Valley Weather Report

A Few Showers to San Francisco for World Series Game Four

October 25, 2014; 8:06 PM ET

Those headed to Game 5 of the World Series Sunday will see drier weather make a return for the second half of the weekend as the system responsible for the rain shifts to the north and west. more >

Is Your Outdoor Gear Waterproof?

Dec 5, 2012; 5:00 AM ET Now that it's cold enough to hit the slopes, you may want to look more closely at what materials your winter sports gear is made of. As it turns out, not all waterproofing is created equal.