• Wed

    Feb 17

    65°Lo 49°

    Mostly cloudy

    Neutral weather for colds
    • Avg
      Temp
      57°
    • Avg
      RealFeel
      55°
    • Hi
      RealFeel
      67°
  • Thu

    Feb 18

    62°Lo 46°

    Partly sunny

    Beneficial weather for colds
    • Avg
      Temp
      54°
    • Avg
      RealFeel
      50°
    • Hi
      RealFeel
      59°
    more
  • Fri

    Feb 19

    65°Lo 49°

    Increasing clouds

    Beneficial weather for colds
    • Avg
      Temp
      57°
    • Avg
      RealFeel
      60°
    • Hi
      RealFeel
      69°
    more
  • Sat

    Feb 20

    60°Lo 48°

    Partly sunny

    Beneficial weather for colds
    • Avg
      Temp
      54°
    • Avg
      RealFeel
      59°
    • Hi
      RealFeel
      67°
    more
  • Sun

    Feb 21

    68°Lo 49°

    A shower in the afternoon

    Beneficial weather for colds
    • Avg
      Temp
      59°
    • Avg
      RealFeel
      61°
    • Hi
      RealFeel
      71°
    more
Next Previous
Hi 65° RealFeel® 67° Precipitation 25%

Day

N

E

S

W

  • SSW 6 mph
  • Gusts: 10 mph

Mostly cloudy

  • Max UV Index: 3 (Moderate)
  • Thunderstorms: 15%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 49° RealFeel® 43° Precipitation 59%

Night

N

E

S

W

  • SE 12 mph
  • Gusts: 17 mph

Cloudy with a little rain

  • Max UV Index: N/A
  • Thunderstorms: 15%
  • Precipitation: 0.1 in
  • Rain: 0.1 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 2 hrs
  • Hours of Rain: 2 hrs

Temperature History - Feb 17

more Historical Weather Data >
  Today Normal Record 2/17/2015
High 65° 61° N/A 54°
Low 49° 45° N/A 50°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:56 AM with 10:54 of sunlight, then sets at 5:50 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:26 PM with 14:27 of moolight, then sets at 3:53 AM

Castro Valley Weather Report

San Francisco: Record-challenging warmth to return early next week

February 13, 2016; 12:52 AM ET

Dry and unseasonably warm conditions will continue in San Francisco next week with another shot of record-breaking warmth. more >

Flu Season is Just Around the Corner

Sep 11, 2012; 2:00 PM ET The peak of flu season may not be until January, but preparations should begin now. Adrienne Veilleux has more.