• Today

    May 4

    70°Lo 55°

    Mostly cloudy

    Watch for hair frizz
    • Wind
      Gust
      15 mph
    • Precip
      15%
    • Hours of Precip
      1
    more
  • Thu

    May 5

    67°Lo 54°

    Variable clouds, a t-storm

    Advisory for hair frizz
    • Wind
      Gust
      14 mph
    • Precip
      55%
    • Hours of Precip
      2.5
    more
  • Fri

    May 6

    66°Lo 53°

    Clouds and sun with a t-storm

    Advisory for hair frizz
    • Wind
      Gust
      14 mph
    • Precip
      59%
    • Hours of Precip
      4
  • Sat

    May 7

    68°Lo 53°

    Times of clouds and sun

    Advisory for hair frizz
    • Wind
      Gust
      10 mph
    • Precip
      25%
    • Hours of Precip
      0
    more
  • Sun

    May 8

    70°Lo 53°

    Partly sunny

    Advisory for hair frizz
    • Wind
      Gust
      13 mph
    • Precip
      25%
    • Hours of Precip
      0
    more
Next Previous
Hi 66° RealFeel® 68° Precipitation 59%

Day

N

E

S

W

  • SW 9 mph
  • Gusts: 14 mph

Intervals of clouds and sunshine with a shower or thunderstorm

  • Max UV Index: 5 (Moderate)
  • Thunderstorms: 40%
  • Precipitation: 0.27 in
  • Rain: 0.27 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 1.5 hrs
  • Hours of Rain: 1.5 hrs
Lo 53° RealFeel® 51° Precipitation 60%

Night

N

E

S

W

  • SSW 5 mph
  • Gusts: 10 mph

Cloudy; a couple of showers in the evening followed by occasional rain and drizzle late

  • Max UV Index: N/A
  • Thunderstorms: 20%
  • Precipitation: 0.08 in
  • Rain: 0.08 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 2.5 hrs
  • Hours of Rain: 2.5 hrs

Temperature History - May 6

more Historical Weather Data >
  Today Normal Record 5/6/2015
High 66° 70° N/A 65°
Low 53° 50° N/A 49°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:06 AM with 13:58 of sunlight, then sets at 8:04 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 6:19 AM with 13:52 of moolight, then sets at 8:11 PM

Castro Valley Weather Report

San Francisco: Showery weather to arrive by late week

May 4, 2016; 12:34 PM ET

Clouds and showers will move into the Bay Area following a dry start to May. more >

Fri. Hair Frizz

Fri. Wind Maps

Fri. UV Index