• Today

    May 23

    63°Lo 54°

    Cool with some sun returning

    Beneficial weather for migraines
    • Hi
      RealFeel
      68°
    • UV
      7 - High
    • Cloud
      Cover
      70%
  • Sun

    May 24

    67°Lo 56°

    Low clouds, then sun and cool

    Beneficial weather for migraines
    • Hi
      RealFeel
      71°
    • UV
      8 - Very High
    • Cloud
      Cover
      60%
    more
  • Mon

    May 25

    66°Lo 56°

    Low clouds, then sunshine

    Beneficial weather for migraines
    • Hi
      RealFeel
      68°
    • UV
      8 - Very High
    • Cloud
      Cover
      60%
    more
  • Tue

    May 26

    68°Lo 55°

    Sun and areas of high clouds

    Beneficial weather for migraines
    • Hi
      RealFeel
      73°
    • UV
      7 - High
    • Cloud
      Cover
      72%
    more
  • Wed

    May 27

    70°Lo 55°

    Mostly sunny and comfortable

    Beneficial weather for migraines
    • Hi
      RealFeel
      75°
    • UV
      8 - Very High
    • Cloud
      Cover
      28%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sat
6am
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  6am 7am 8am 9am 10am 11am 12pm 1pm
Forecast
Cloudy
Mostly Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Temp (°F) 55° 55° 56° 57° 58° 59° 61° 63°
RealFeel® 51° 52° 54° 56° 57° 60° 63° 65°
Humidity 84% 83% 80% 76% 72% 69% 67% 67%
   
  6am 7am 8am 9am 10am 11am 12pm 1pm
Rain
 
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0%
Snow
 
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Ice
 
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  6am 7am 8am 9am 10am 11am 12pm 1pm
Wind (mph) 9 SW 9 SW 8 SW 8 SW 8 SW 8 SW 9 WSW 10 WSW
UV Index 0 0 0 1 2 3 4 4
Cloud Cover 91% 89% 100% 100% 96% 95% 95% 95%
Dew Point 51° 50° 50° 50° 49° 49° 50° 51°
Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - May 23

more Historical Weather Data >
  Today Normal Record 5/23/2014
High 63° N/A N/A 69°
Low 54° N/A N/A 51°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:53 AM with 14:25 of sunlight, then sets at 8:18 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 11:10 AM with 13:43 of moolight, then sets at 12:53 AM

Castro Valley Weather Report

San Francisco: Cool, Cloudy Weather to Linger for Holiday Weekend

May 23, 2015; 5:17 AM ET

More clouds and cooler weather can be expected across the Bay Area through the holiday weekend and into the new week. more >

Sat. Migraine Headache

Sat. UV Index