• Today

    May 27

    65°Lo 53°

    Low clouds, then some sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      71°
    • UV
      8 - Very High
    • Cloud
      Cover
      47%
    more
  • Thu

    May 28

    67°Lo 54°

    Low clouds, then some sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      73°
    • UV
      8 - Very High
    • Cloud
      Cover
      70%
    more
  • Fri

    May 29

    69°Lo 54°

    Clearing and pleasant

    Beneficial weather for migraines
    • Hi
      RealFeel
      74°
    • UV
      8 - Very High
    • Cloud
      Cover
      55%
  • Sat

    May 30

    72°Lo 55°

    Areas of low clouds, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      77°
    • UV
      8 - Very High
    • Cloud
      Cover
      50%
    more
  • Sun

    May 31

    71°Lo 57°

    Low clouds, then some sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      75°
    • UV
      8 - Very High
    • Cloud
      Cover
      60%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Fri
1am
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  1am 2am 3am 4am 5am 6am 7am 8am
Forecast
Mostly Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Mostly Cloudy
Mostly Cloudy
Cloudy
Temp (°F) 54° 54° 54° 54° 54° 54° 55° 57°
RealFeel® 52° 52° 52° 52° 52° 53° 53° 57°
Humidity 91% 93% 91% 89% 90% 89% 88% 87%
   
  1am 2am 3am 4am 5am 6am 7am 8am
Rain
 
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Snow
 
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Ice
 
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  1am 2am 3am 4am 5am 6am 7am 8am
Wind (mph) 7 WSW 6 WSW 6 WSW 6 WSW 6 SW 6 WSW 6 WSW 6 WSW
UV Index 0 0 0 0 0 0 0 1
Cloud Cover 89% 90% 90% 90% 90% 89% 89% 90%
Dew Point 52° 52° 51° 51° 51° 51° 51° 53°
Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - May 29

more Historical Weather Data >
  Today Normal Record 5/29/2014
High 69° N/A N/A 78°
Low 54° N/A N/A 50°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:50 AM with 14:32 of sunlight, then sets at 8:22 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:41 PM with 11:22 of moolight, then sets at 4:03 AM

Castro Valley Weather Report

San Francisco: Dry, Pleasant Weather to Hold Through Weekend

May 27, 2015; 4:50 PM ET

A dry and quiet pattern will be in place across the Bay area over the next several days before rain returns early in the new week. more >

Fri. Migraine Headache

Fri. UV Index