• Tonight

    Apr 26

    Lo 57°

    Patchy clouds

    Asthma Weather
    • Hi
      RealFeel
      73°
    • UV
      8 - Very High
    • Air Qual.
      Good
  • Mon

    Apr 27

    81°Lo 55°

    Sunny and warmer

    Beneficial weather for asthma
    • Hi
      RealFeel
      87°
    • UV
      8 - Very High
    • Air Qual.
      Good
    more
  • Tue

    Apr 28

    70°Lo 54°

    Mostly sunny and nice

    Beneficial weather for asthma
    • Hi
      RealFeel
      76°
    • UV
      8 - Very High
    • Air Qual.
      Good
    more
  • Wed

    Apr 29

    73°Lo 55°

    Mostly sunny

    Beneficial weather for asthma
    • Hi
      RealFeel
      80°
    • UV
      8 - Very High
    • Cloud
      Cover
      15%
    more
  • Thu

    Apr 30

    82°Lo 57°

    Mostly sunny and nice

    Beneficial weather for asthma
    • Hi
      RealFeel
      86°
    • UV
      8 - Very High
    • Cloud
      Cover
      13%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sun
9pm
10pm 11pm Mon
12am
1am 2am 3am 4am
  9pm 10pm 11pm 12am 1am 2am 3am 4am
Forecast
Partly Cloudy
Partly Cloudy
Partly Cloudy
Mostly Clear
Mostly Clear
Mostly Clear
Mostly Clear
Mostly Clear
Temp (°F) 57° 58° 58° 58° 58° 58° 61° 65°
RealFeel® 53° 55° 57° 58° 59° 59° 62° 65°
Humidity 78% 77% 75% 72% 73% 72% 61% 53%
   
  9pm 10pm 11pm 12am 1am 2am 3am 4am
Rain
 
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Snow
 
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Ice
 
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  9pm 10pm 11pm 12am 1am 2am 3am 4am
Wind (mph) 10 W 7 W 5 WNW 4 WNW 4 N 2 ENE 2 ENE 2 ENE
UV Index 0 0 0 0 0 0 0 0
Cloud Cover 46% 37% 30% 23% 17% 10% 10% 10%
Dew Point 50° 51° 50° 49° 49° 49° 48° 47°
Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F

Temperature History - Apr 26

more Historical Weather Data >
  Today Normal Record 4/26/2014
High 68° N/A N/A 59°
Low 57° N/A N/A 42°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:19 AM with 13:35 of sunlight, then sets at 7:54 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:21 PM with 13:33 of moolight, then sets at 2:54 AM

Castro Valley Weather Report

San Francisco: Dry Pattern to Continue After Weekend Showers

April 26, 2015; 12:41 PM ET

Warm and dry conditions will begin the new week in San Francisco. more >

The Dangers of Bus Travel

Dec 10, 2012; 5:00 AM ET While bus transportation is one of the most affordable, it is important to know which motor coach companies rank highest in safety.

Sun. Air Quality

Sun. Asthma Risk

Sun. UV Index