• Today

    Sep 5

    81°Lo 54°

    Mostly sunny and warmer

    Beneficial weather for migraines
    • Hi
      RealFeel
      84°
    • UV
      5 - High
    • Cloud
      Cover
      11%
  • Sun

    Sep 6

    86°Lo 54°

    Plenty of sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      89°
    • UV
      5 - High
    • Cloud
      Cover
      4%
    more
  • Mon

    Sep 7

    88°Lo 57°

    Plenty of sunshine

    Beneficial weather for migraines
    • Hi
      RealFeel
      90°
    • UV
      5 - High
    • Cloud
      Cover
      1%
    more
  • Tue

    Sep 8

    88°Lo 59°

    Areas of low clouds, then sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      91°
    • UV
      5 - High
    • Cloud
      Cover
      43%
    more
  • Wed

    Sep 9

    88°Lo 59°

    Mostly sunny and very warm

    Beneficial weather for migraines
    • Hi
      RealFeel
      91°
    • UV
      5 - High
    • Cloud
      Cover
      11%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sat
3am
4am 5am 6am 7am 8am 9am 10am
  3am 4am 5am 6am 7am 8am 9am 10am
Forecast
Partly Cloudy
Mostly Clear
Mostly Clear
Mostly Clear
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 56° 56° 55° 53° 55° 50° 54° 58°
RealFeel® 54° 54° 54° 53° 56° 52° 58° 64°
Humidity 81% 81% 83% 88% 86% 98% 87% 72%
   
  3am 4am 5am 6am 7am 8am 9am 10am
Rain
 
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0%
Snow
 
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Ice
 
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  3am 4am 5am 6am 7am 8am 9am 10am
Wind (mph) 6 NE 6 NE 5 NNE 5 N 4 N 4 SE 5 SE 5 SE
UV Index 0 0 0 0 0 1 2 4
Cloud Cover 47% 26% 25% 25% 25% 14% 17% 11%
Dew Point 51° 50° 50° 49° 51° 50° 50° 49°
Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F Middle Grid line 45 F

Temperature History - Sep 5

more Historical Weather Data >
  Today Normal Record 9/5/2014
High 81° N/A N/A 73°
Low 54° N/A N/A 59°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:42 AM with 12:50 of sunlight, then sets at 7:32 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:26 PM with -2:-06 of moolight, then sets at 2:20 PM

Castro Valley Weather Report

San Francisco: Pleasant Stretch Continues Through Labor Day

September 5, 2015; 10:08 AM ET

As a ridge moves in from the west over the weekend and early next week, high temperatures will swing back above normal. more >

Sat. Migraine Headache

Sat. UV Index