• Today

    Sep 4

    73°Lo 53°

    Mostly sunny

    Neutral weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      5 - High
    more
  • Sat

    Sep 5

    80°Lo 54°

    Mostly sunny

    Beneficial weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      5 - High
    more
  • Sun

    Sep 6

    85°Lo 55°

    Plenty of sun

    Beneficial weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      5 - High
  • Mon

    Sep 7

    87°Lo 56°

    Plenty of sunshine

    Neutral weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      5 - High
    more
  • Tue

    Sep 8

    86°Lo 55°

    Areas of low clouds, then sun

    Beneficial weather for arthritis pain
    • Rain
      0 in
    • Hours of Precip
      0
    • UV
      5 - High
    more
Next Previous
Hi 85° RealFeel® 88° Precipitation 1%

Day

N

E

S

W

  • NW 7 mph
  • Gusts: 15 mph

Plenty of sun

  • Max UV Index: 7 (High)
  • Thunderstorms: 1%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 55° RealFeel® 57° Precipitation 1%

Night

N

E

S

W

  • W 4 mph
  • Gusts: 10 mph

Clear

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

Temperature History - Sep 6

more Historical Weather Data >
  Today Normal Record 9/6/2014
High 85° N/A N/A 71°
Low 55° N/A N/A 56°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:43 AM with 12:47 of sunlight, then sets at 7:30 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 12:48 AM with 14:26 of moolight, then sets at 3:14 PM

Castro Valley Weather Report

San Francisco: Pleasant Stretch Continues Through Labor Day

September 4, 2015; 5:12 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 >

Sun. Arthritis Pain

Sun. UV Index