• Tonight

    Jul 13

    Lo 57°

    Partly cloudy

    Sinus Headache Weather
    • Hi
      RealFeel
      78°
    • UV
      9 - Very High
    • Cloud
      Cover
      44%
    more
  • Mon

    Jul 14

    82°Lo 60°

    Mostly sunny

    Beneficial weather for sinus headaches
    • Hi
      RealFeel
      87°
    • UV
      9 - Very High
    • Cloud
      Cover
      20%
    more
  • Tue

    Jul 15

    80°Lo 61°

    Mostly sunny

    Beneficial weather for sinus headaches
    • Hi
      RealFeel
      82°
    • UV
      8 - Very High
    • Cloud
      Cover
      20%
  • Wed

    Jul 16

    75°Lo 60°

    Mostly sunny

    Beneficial weather for sinus headaches
    • Hi
      RealFeel
      78°
    • UV
      9 - Very High
    • Cloud
      Cover
      19%
    more
  • Thu

    Jul 17

    75°Lo 59°

    Areas of low clouds, then sun

    Beneficial weather for sinus headaches
    • Hi
      RealFeel
      77°
    • UV
      8 - Very High
    • Cloud
      Cover
      47%
    more
Next Previous
Hi 80° RealFeel® 82° Precipitation 1%

Day

N

E

S

W

  • W 9 mph
  • Gusts: 15 mph

Mostly sunny

  • Max UV Index: 8 (Very High)
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 61° RealFeel® 58° Precipitation 1%

Night

N

E

S

W

  • WSW 6 mph
  • Gusts: 12 mph

Clear to partly cloudy

  • Max UV Index: N/A
  • Thunderstorms: 1%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Jul 15

more Historical Weather Data >
  Today Normal Record 7/15/2013
High 80° N/A N/A 69°
Low 61° N/A N/A 54°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:58 AM with 14:32 of sunlight, then sets at 8:30 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 10:46 PM with 12:17 of moolight, then sets at 11:03 AM

Top Story

Castro Valley Weather Report

San Francisco: Partially Sunny Skies, Rise in Temperature Ahead

July 13, 2014; 1:45 PM ET

San Francisco will see a rise in temperatures over the next several days as partially cloudy skies make way for plenty of sunshine. more >

Battling the Common Cold

Jun 23, 2014; 5:00 AM ET Marja Martinez talks about identifying and fighting the common cold.

Tue. Sinus Headache

Tue. UV Index