• Early AM

    Oct 23

    Lo 55°

    Partly to mostly cloudy

    Ragweed Pollen Weather
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Today

    Oct 23

    74°Lo 55°

    Rather cloudy

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Fri

    Oct 24

    76°Lo 58°

    Sunshine and warm

    Low ragweed pollen levels
    • Grass
      Pollen
      0 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Sat

    Oct 25

    70°Lo 56°

    A little afternoon rain

    Low ragweed pollen levels
    • Precip
      59%
    • Wind
      Speed
      14 mph
    • Cloud
      Cover
      89%
  • Sun

    Oct 26

    68°Lo 50°

    Times of clouds and sun

    Low ragweed pollen levels
    • Precip
      13%
    • Wind
      Speed
      9 mph
    • Cloud
      Cover
      53%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sat
9am
10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Cloudy
Showers
Cloudy
Mostly Cloudy
Mostly Cloudy
Cloudy
Cloudy
Showers
Temp (°F) 62° 63° 65° 66° 66° 67° 68° 70°
RealFeel® 57° 58° 61° 62° 63° 64° 65° 65°
Humidity 84% 81% 79% 77% 75% 73% 71% 70%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
47%
 
51%
 
39%
 
33%
 
33%
 
34%
 
37%
 
40%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 13 S 13 SSW 14 SSW 14 SSW 15 SSW 15 SW 15 SW 14 SW
UV Index 0 1 1 2 2 2 2 1
Cloud Cover 90% 90% 90% 89% 89% 90% 90% 90%
Dew Point 57° 58° 58° 58° 58° 58° 59° 59°
Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F

Temperature History - Oct 25

more Historical Weather Data >
  Today Normal Record 10/25/2013
High 70° N/A N/A 70°
Low 56° N/A N/A 49°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:26 AM with 10:52 of sunlight, then sets at 6:18 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 9:10 AM with 10:37 of moolight, then sets at 7:47 PM

Castro Valley Weather Report

World Series, Rain Head to San Francisco

October 23, 2014; 5:01 AM ET

Rain is expected to make a return to the Bay Area by the weekend, just in time for games 3 and 4 of the World Series. more >

Sat. Dust & Dander

Sat. Wind Maps