• Today

    May 4

    69°Lo 54°

    Partly sunny

    Excellent for lawn mowing
    • Hours of Precip
      1.5
    • Precip
      43%
    • Hi
      RealFeel
      72°
  • Thu

    May 5

    67°Lo 53°

    Variable clouds, a t-storm

    Good for lawn mowing
    • Hours of Precip
      2
    • Precip
      56%
    • Hi
      RealFeel
      70°
    more
  • Fri

    May 6

    65°Lo 53°

    Clouds and sun with a t-storm

    Good for lawn mowing
    • Hours of Precip
      4
    • Precip
      61%
    • Hi
      RealFeel
      66°
    more
  • Sat

    May 7

    70°Lo 56°

    Times of clouds and sun

    Very Good for lawn mowing
    • Hours of Precip
      0
    • Precip
      25%
    • Hi
      RealFeel
      73°
    more
  • Sun

    May 8

    69°Lo 52°

    Partly sunny

    Excellent for lawn mowing
    • Hours of Precip
      0
    • Precip
      17%
    • Hi
      RealFeel
      75°
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Wed
5am
6am 7am 8am 9am 10am 11am 12pm
  5am 6am 7am 8am 9am 10am 11am 12pm
Forecast
Cloudy
Cloudy
Cloudy
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Partly Sunny
Temp (°F) 55° 55° 56° 57° 59° 61° 64° 66°
RealFeel® 53° 53° 54° 57° 61° 65° 69° 71°
Humidity 89% 89% 87% 83% 78% 72% 68% 66%
   
  5am 6am 7am 8am 9am 10am 11am 12pm
Rain
 
1%
 
1%
 
2%
 
5%
 
5%
 
6%
 
7%
 
7%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  5am 6am 7am 8am 9am 10am 11am 12pm
Wind (mph) 7 WNW 6 WNW 6 W 7 W 7 W 8 WSW 8 WSW 10 WSW
UV Index 0 0 0 1 2 4 6 7
Cloud Cover 91% 90% 90% 45% 45% 45% 45% 45%
Dew Point 52° 52° 52° 52° 53° 52° 53° 54°
Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - May 4

more Historical Weather Data >
  Today Normal Record 5/4/2015
High 69° 69° N/A 61°
Low 54° 50° N/A 51°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:08 AM with 13:54 of sunlight, then sets at 8:02 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:55 AM with 12:53 of moolight, then sets at 5:48 PM

Castro Valley Weather Report

San Francisco: Showery weather to arrive by late week

May 4, 2016; 4:34 AM ET

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

Current Drought Status

Current Soil Conditions

Wed. Overnight Freeze

Wed. Degree Days

Wed. Evapotranspiration