• Today

    May 26

    71°Lo 51°

    Clouds giving way to sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      76°
    • UV
      7 - Very High
    • Cloud
      Cover
      42%
    more
  • Fri

    May 27

    79°Lo 52°

    Mostly sunny and pleasant

    Beneficial weather for migraines
    • Hi
      RealFeel
      83°
    • UV
      7 - Very High
    • Cloud
      Cover
      18%
    more
  • Sat

    May 28

    81°Lo 51°

    Mostly sunny

    Beneficial weather for migraines
    • Hi
      RealFeel
      86°
    • UV
      7 - Very High
    • Cloud
      Cover
      11%
    more
  • Sun

    May 29

    80°Lo 53°

    Mostly sunny

    Beneficial weather for migraines
    • Hi
      RealFeel
      84°
    • UV
      7 - Very High
    • Cloud
      Cover
      18%
  • Mon

    May 30

    81°Lo 53°

    Very warm with sunshine

    Beneficial weather for migraines
    • Hi
      RealFeel
      86°
    • UV
      7 - Very High
    • Cloud
      Cover
      6%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sun
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10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 63° 67° 71° 74° 77° 78° 80° 78°
RealFeel® 70° 75° 81° 83° 84° 84° 84° 81°
Humidity 65% 55% 50% 47% 42% 39% 38% 41%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
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Snow
 
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Ice
 
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  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 4 SW 4 SW 4 SW 6 W 8 WNW 9 NW 9 WNW 10 WNW
UV Index 3 5 7 8 9 8 7 5
Cloud Cover 22% 21% 20% 19% 19% 20% 21% 21%
Dew Point 51° 50° 51° 52° 52° 52° 52° 52°
Middle Grid line 85 F Middle Grid line 80 F Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F

Temperature History - May 29

more Historical Weather Data >
  Today Normal Record 5/29/2015
High 80° 73° N/A 68°
Low 53° 53° N/A 52°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:49 AM with 14:34 of sunlight, then sets at 8:23 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:37 AM with 11:37 of moolight, then sets at 1:14 PM

Castro Valley Weather Report

San Francisco: Milder air to build ahead of Memorial Day weekend

May 26, 2016; 10:58 AM ET

Following a stretch of cool days, milder air will begin to build across the Bay area heading into Memorial Day weekend. more >

Sun. Migraine Headache

Sun. UV Index