• Today

    Jul 30

    82°Lo 58°

    Mostly sunny

    Watch for hair frizz
    • Wind
      Gust
      15 mph
    • Precip
      1%
    • Hours of Precip
      0
  • Sun

    Jul 31

    79°Lo 58°

    Clouds, then sun

    Advisory for hair frizz
    • Wind
      Gust
      14 mph
    • Precip
      5%
    • Hours of Precip
      0
    more
  • Mon

    Aug 1

    79°Lo 56°

    Areas of fog, then sun

    Watch for hair frizz
    • Wind
      Gust
      15 mph
    • Precip
      2%
    • Hours of Precip
      0
    more
  • Tue

    Aug 2

    79°Lo 54°

    Mostly sunny and nice

    Advisory for hair frizz
    • Wind
      Gust
      13 mph
    • Precip
      2%
    • Hours of Precip
      0
    more
  • Wed

    Aug 3

    78°Lo 56°

    Fog to sun

    Advisory for hair frizz
    • Wind
      Gust
      13 mph
    • Precip
      1%
    • Hours of Precip
      0
    more
Next Previous
Next 8 hours >
  Sat
7am
8am 9am 10am 11am 12pm 1pm 2pm
  7am 8am 9am 10am 11am 12pm 1pm 2pm
Forecast
Cloudy
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 58° 61° 65° 68° 72° 76° 79° 81°
RealFeel® 56° 63° 69° 73° 79° 83° 85° 86°
Humidity 86% 78% 69% 60% 56% 54% 49% 45%
   
  7am 8am 9am 10am 11am 12pm 1pm 2pm
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  7am 8am 9am 10am 11am 12pm 1pm 2pm
Wind (mph) 6 WNW 5 WNW 6 WNW 6 WNW 7 W 8 W 8 W 10 W
UV Index 0 1 3 5 6 8 9 8
Cloud Cover 90% 25% 25% 25% 25% 11% 11% 11%
Dew Point 54° 54° 55° 54° 56° 58° 58° 58°
Middle Grid line 85 F Middle Grid line 80 F Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F

Temperature History - Jul 30

more Historical Weather Data >
  Today Normal Record 7/30/2015
High 82° 78° N/A 79°
Low 58° 57° N/A 59°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:11 AM with 14:07 of sunlight, then sets at 8:18 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:09 AM with 14:31 of moolight, then sets at 5:40 PM

Castro Valley Weather Report

Western US: Diminishing heat to aid in firefighting efforts this week

July 30, 2016; 10:08 AM ET

As several large fires continue to rage across the western United States, weather conditions will gradually improve for firefighting efforts in the upcoming week. more >

Sat. Hair Frizz

Sat. Wind Maps

Sat. UV Index